seagate ST318436LW, ST318436LC, ST318436LWV, ST318436LCV, ST318426LW Product Manual

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Barracuda 18XL Family:

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ST318436LW/LC/LWV/LCV

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ST318426LW/LC, ST3184 16N/W

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ST39236LW/LC/LWV/LCV

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ST39226LW/LC, ST39216N/W

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Product Manual, Volume 1

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Barracuda 18XL Family:

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ST318436LW/LC/LWV/LCV

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ST318426LW/LC, ST3184 16N/W

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ST39236LW/LC/LWV/LCV

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ST39226LW/LC, ST39216N/W

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Product Manual, Volume 1

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Publication number: 77767535, Rev. B

September 2000

Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology, LLC. Barracuda, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademar ks or registe red trademarks of Seagate Te chnology, LLC, or one of its subsidiaries. Al l other trademarks or registered trademar ks are the property of their respective owners.

Seagate reserves the right to change, without notice, product offerings or specifications. No part of this publica-

tion may be reproduced in any form without written permission of Seagate Technology, LLC.

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

Rev. A 01/18/2000 D. Ashby/B. Reynolds 1/1, v thru viii, 1-98. Rev. B 09/12/2000 K. Schweiss/ B. Reynolds front cover, ii, 1, 5, 7, 9-10, 31-33, 60,

64-65, 78, 85-87, and backcover.

Notice. Product Manual 77767535 is Volume 1 of a two volume document with the SCSI Interface information in

the Volume 2 SCSI Interface Product Manual, part number 75789509. If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered,

part number 75789509.

Barracuda 18XL Product Manual, Rev. B v

1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.1.2 Electromagnetic susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.5 Unformatted and formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.6 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.7 Factory installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.9 Accessories (user installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Internal drive characteristics (transparent to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 SCSI performance characteristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.2 Format command execution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.3 Generalized performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.5.3 Optimizing cache performance for desktop and server applications . . . . . . . . . . . 12

5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.1.4 Seek errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.5 Service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.6 Hot plugging Barracuda 18XL disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.2.7 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5.2.8 Drive Self Test (DST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.2.9 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.2.3 Current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

vi Barracuda 18XL Product Manual, Rev. B

6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

7.1 Drive internal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

7.2 Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

7.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

8.1.1 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

8.3.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

9.0 Interface requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

9.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

9.4 SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .61

9.5 Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

9.5.1 Synchronous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

9.5.2 REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

9.6 Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

9.6.3 SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

9.7.1 Single-ended drivers/receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

9.7.2 Multimode—SE or LVD alternative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

9.8 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

10.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 7

Barracuda 18XL Product Manual, Rev. B vii

List of Figures

Figure 1. Barracuda 18XL family drive (model “LC” version with 80-pin SCSI I/O connector shown). . . 1

Figure 2. Barracuda 18XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3a. Typical Barracuda 18XL family drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 3b. Typical Barracuda 18XL family drive +5 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 3c. DC current and power vs. input/output operations per second for ST318436

drives (LVD only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 3d. DC current and power vs. input/output operations per second for ST39236 drives

(SE only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 4. Locations of PCBA components listed in Table 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 5. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 6a. Mounting configuration dim ens io ns for “W,” “LW,” and “LWV” model . . . . . . . . . . . . . . . . . . 33

Figure 6b. Mounting configuration dim ens io ns for “LC” and “LCV” model . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 6c. Mounti ng con fig ur ati on dim ens io ns for “N” models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 7a. Barracuda 18XL family drive ID select (W/LW/LC/LWV/LCV models). . . . . . . . . . . . . . . . . . 40

Figure 7b. Barracuda 18XL family drive ID select header J6 for N model (J6 Pins 1–12) . . . . . . . . . . . 41

Figure 7c. Barracuda 18XL family drive ID select header J5 for W/LW/LWV models (J5 Pins 1–12). . . 42

Figure 7d. Barracuda 18XL family drive option select header (for LW/LC/LWV/LCV models) . . . . . . . . 43

Figure 7e. Barracuda 18XL family drive option select header (for N and W models) . . . . . . . . . . . . . . . 43

Figure 8. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 9a. Model “LW” and “LWV” drive physical interface (68 pin J1 SCSI I/O connector). . . . . . . . . . 64

Figure 9b. Model “LC” and “LCV” drive physical interface (80 pin J1 SCSI I/O connector and

DC power connector) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 9c. Models “N” and “W” drive physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 10a. SCSI daisy chain interface cabling for “LW” model drives . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 10b. SCSI daisy-chain interface cabling for “N” and “W” model drives . . . . . . . . . . . . . . . . . . . . . 70

Figure 11a. Nonshielded 68-pin SCSI device connector used on “LW” models . . . . . . . . . . . . . . . . . . . . 71

Figure 11b. Nonshielded 80 pin SCSI “SCA-2” connector, used on “LC” models. . . . . . . . . . . . . . . . . . . 72

Figure 11c. Nonshielded 50-pin connector for “N” and “W” models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Figure 12. Single-ended transmitters and receivers on “N” and “W” models . . . . . . . . . . . . . . . . . . . . . 81

Figure 13. LVD steady-state output voltage test circuit (T10/1302D, Annex A, Figure 1). . . . . . . . . . . . 83

Figure 14. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Barracuda 18XL Product Manual, Rev. B 1

1.0 Scope

This manual describes the Seagate Technology®, LLC. Barracuda 18XL™ disc dri ves. Barracuda 18XL dr ives suppor t the small compu ter system interface (SCSI) as described in the ANSI SCSI,

SCSI-2, and SCSI-3 (Fast-20, Fast-40, and Fast-80) interface specifications to the extent described in this manual.* Ultra, Ultra2, and Ultra160 are the names Seagate calls these interfaces. The SCSI Interfac e P r odu ct Manual (pa r t number 75 789509) d escri bes gene ral SCSI i nterface character istic s of this and other families of Seagate drives.

From this point on in this product manual th e reference to Bar racuda 18X L mode ls is re ferred to as “the dr ive” (unless references to individual models are necessary).

Figure 1. Barracuda 18XL family drive (model “LC” version with 80-pin SCSI I/O connector shown)

*The ANSI specifications have now replaced the terms “SCSI,” “SCSI-2,” and “SCSI-3” with “SCSI.”

2 Barracuda 18XL Product Manual, Rev. B

Barracuda 18XL Product Manual, Rev. B 3

2.0 Applicable standards and reference documentation

The drive has been developed as a system peripheral to the highest standards of design and construction. The drive depends upon i ts host equip ment to provide adequ ate power and environment i n order to achieve optimum performance and compli ance with applicable industry and governm ental regulations. Special attention must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regulation. In particular, the drive must be securely mounted in orde r to guara ntee the s pec if ied per formance characteristics. Mounting by bottom holes must meet the requirements of Section 8.4.

2.1 Standards

The Barracuda 18XL family complies with Seagate standards as noted in the appropriate sections of this Manual and the Seagate SCSI Interface Product Manual, part number 75789509 (Vol. 2).

The Barracuda 18XL d isc dri ve is a UL r ecogn ized co mponen t per UL1950 , CSA certified to CA N/CSA C22.2 No. 950-95, and VDE certified to VDE 0805 and EN60950.

2.1.1 Electromagnetic compatibility

The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to use. As such the drive is suppli ed as a subassembly and is not su bject to Subpar t B of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communications.

The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communications when properly packaged. However, it is the user’s responsibility to assure that the drive meets the appropriate EMI req uirements in their syst em. Shielded I/O cables may be required if the e nclosure does not provide ad equate sh ielding. If the I/O c ables are externa l to the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host controller.

2.1.2 Electromagnetic susceptibility

As a component assembly, the drive is not required to meet any susceptibility per formance requ irements. It is the responsibility of tho se integrating the dr ive within their sy stem s to perform thos e tests req uired and design their system to ensu re that equipment operating in the sam e system as the drive or external to the s ystem does not adversely affect the performance of the drive. See also Section 5.1.1 and Table 2, DC power requirements.

2.2 Electromagnetic compliance

Seagate uses an independ ent laboratory to co nfirm compliance to the directives/standard(s) for CE Mark ing and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected system represents the most popular characteristics for test platforms. The system configurations include:

• Typical current use microprocessor

• 3.5-inch floppy disc drive

• Keyboard

• Monitor/display

• Printer

• External modem

• Mouse

Although the test system wi th this Seag ate mode l co mpl ie s to the dire cti ves/standa rd(s ), we cann ot gua rante e that all systems will comply. The computer manufacturer or system i ntegrator shall confir m EMC complianc e and provide CE Marking and C-Tick Marking for their product.

Electromagnetic compliance for the European Union

If this model has the CE Marki ng it complies with the European Union requirem ents of the Electromagnetic Compatibility Direc tive 89/336/EEC o f 03 May 1989 as ame nded by Direct ive 92/31/EE C of 28 Ap r il 1992 an d Directive 93/68/EEC of 22 July 1993.

4 Barracuda 18XL Product Manual, Rev. B

Australian C-Tick

If this model has the C-Tick Markin g it complies with the Australia/New Zea land Standard A S/NZS3548 199 5 and meets the Electro magnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Management Agency (SMA).

2.3 Reference documents

Barracuda 18XL Installation Guide (for LW/LC/LWV/LCV) Seagate P/N 75789511 Safety and Regulatory Agency Spec ifi cation Seagate P/N 75789512 SCSI Interface Product Manual Seagate P/N 75789509

ANSI small computer system interface (SCSI) document numbers:

X3.131-1994 SCSI-2 T10/1302D SPI-3 X3T10/1143D EPI T10/1236D SPC-2 T10/999D SBC

T10/1157D SAM-2 SFF-8046 Specification for 80-pin connector for SCSI disk drives SCA-2 EIA Specification ANSI/EIA Package Test Specification Seagate P/N 30190-001 (under 100 lb.) Package Test Specification Seagate P/N 30191-001 (over 100 lb.) Specification, Acoustic Test Requirements, and Procedures Seagate P/N 30553-001 In case of conflict between this document and any referenced document, this document takes precedence.

Barracuda 18XL Product Manual, Rev. B 5

3.0 General description

Barracuda 18XL drives combine magnetoresistive (GMR) heads, partial response/maximum likelihood (PRML) read channel elec tro ni cs, em bed ded s ervo technology, an d a SCSI-3 (Fast-20, Fast 40, and Fast-80) interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.

Fast-20, Fast-40, and Fast-80 (also known as Ultra SCS I, Ultra-2 SCS I, and Ultra160 SCSI, res pectively) are negotiated transfer rates. These transfer rates will occur only if your host adapter also suppor ts these data transfer rates. This drive also operates at SCSI-1 and SCS I-2 data transfer rates for backward compatibility with non-Fast-20/Fast-40/Fast-80 capable SCSI host adapters.

Note.

ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

Table 1 lists the features that differentiate the various Barracuda 18XL models.

Table 1: Drive model number vs. differentiating features

Model number

Number of heads I/O circuit type [1]

Number of I/O connector pins

Number of I/O data bus bits

Data buffer size

ST318436LW 6 multimode (SE/LVD) 68 16 2 MB ST318436LC 6 multimode (SE/LVD) 80 16 2 MB ST318436LWV 6 multimode (SE/LVD) 68 16 4 MB ST318436LCV 6 multimode (SE/LVD) 80 16 4 MB ST318426LW 6 multimode (SE/LVD) 68 16 1 MB [2] ST318426LC 6 multimode (SE/LVD) 80 16 1 MB [2] ST318416N 6 single-ended 50 8 2 MB ST318416W 6 single-ended 68 16 2 MB ST39236LW 3 multimode (SE/LVD) 68 16 2 MB ST39236LC 3 multimode (SE/LVD) 80 16 2 MB ST39236LWV 3 multimode (SE/LVD) 68 16 4 MB ST39236LCV 3 multimode (SE/LVD) 80 16 4 MB ST39226LW 3 multimode (SE/LVD) 68 16 1 MB [2] ST39226LC 3 multimode (SE/LVD) 80 16 1 MB [2] ST39216N 3 single-ended 50 8 2 MB ST39216W 3 single-ended 68 16 2 MB

[1] See Section 9.6 for details and definitions. [2] Fast-80/Ultra160 mode not supported by this model.

The drive records and recovers data on 3.0-inch (74 mm) non-removeable discs. The drive suppor ts the Small Comp uter System Inter face (SCSI) as described in the ANSI SCSI S PI-3 inter-

face specifications to the extent des cribed in thi s manual (volume 1), whic h defines the prod uct performance characteristics of the Barracuda 18XL family of drives, and the SCSI Interface Product Manual (volume 2), part number 75789509, which de scribes the general interface charac teristic s of this and other families of Seagate SCSI drives.

6 Barracuda 18XL Product Manual, Rev. B

The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets (logical block addressing is used).

The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable filter to maintain a contamination-free HDA environment.

Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only—nev er di sass emble the HDA and do not attempt to service items in the se aled e nclos ure (h eads, med ia, actuat or, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.

Barracuda 18XL drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing in the data zone. The drive automatically goe s to the landing zone when power is removed.

An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and ha ndl ing . The s hi ppi ng lock automa tic al ly disengages when power is applied to the d rive and the head load process begins.

Barracuda 18XL dr ives decode track 0 location data f rom the ser vo data embedd ed on each su rface to eliminate mechanical transducer adjustments and related reliability concerns.

A high-performance actuator assembly with a low-inertia, balanced, patented, straigh t-arm design provides excellent performance with minimal power dissipation.

Figure 2. Barracuda 18XL family drive

Barracuda 18XL Product Manual, Rev. B 7

3.1 Standard features

The Barracuda 18XL family has the following standard features:

• Integrated SCSI controller

• SCSI multimode single-ended or low voltage differential drivers and receivers

• 8 bit or 16 bit I/O data bus models available

• Asynchronous and synchronous data transfer protocol

• Firmware downloadable via SCSI interface

• Selectable sector sizes from 512 to 4,096 bytes/sector in multiples of 2 bytes/sector

• Programmable drive capacity

• Programmable sector reallocation scheme

• Flawed sector reallocation at format time

• Programmable auto write and read reallocation

• Reallocation of defects on command (post format)

• Enhanced ECC correction capability up to 240 bits

• Sealed head and disc assembly

• No preventative maintenance or adjustment required

• Dedicated laser textured head landing zone

• Embedded servo data rather than a separate servo data surface

• Self diagnostics performed when power is applied to the drive

• 1:1 Interleave

• Zoned bit recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• 2 MByte data buffer standard (1 Mbyte on some drives, see Table 1) or 4 Mbyte optional

• Hot plug compatibility

• Low audible noise for office environment

• Low power consumption

3.2 Media characteristics

The media used on the dr ive has a di ameter of a pproximately 3 .0 in ches (7 4 mm). The alumi num substrat e is coated with a thin film magneti c mat eria l, overcoated with a propr iet ar y prote ctive layer for improved durability and environmental protection.

3.3 Performance

• Suppor ts i ndu stry standard Fast-20, Fast-40, and Fast-80 SCSI interfaces (also called “Ultra SCSI,” “Ultra-2 SCSI,” and “Ultra160 SCSI,” respectivel y)

Note.

• Programmable multi-segmentable cache buffer (see Section 4.4)

• 7200 RPM spindle. Average latency = 4.17 msec

• Command queuing of up to 64 commands

• Background processing of queue

• Supports start and stop commands (spindle stops spinning)

3.4 Reliability

• 1,200,000 hour MTBF (mature)

• LSI circuitry

• Balanced low mass rotary voice coil actuator

• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)

• Incorporates Seek To Improve Reli ab il ity algor i thm (STIR)

• 5-year warranty

ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

8 Barracuda 18XL Product Manual, Rev. B

3.5 Unformatted and formatted capacities

Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows the standar d OEM model rea d capacities da ta. Total LBAs = read c apacity data (shown below) +1.

Formatted data block size 512 bytes/sector [1] [2]

ST318436 35,885,167 (223906Fh) (18.373 GB) ST318426 35,885,167 (223906Fh) (18.373 GB) ST318416 35,885,167 (223906Fh) (18.373 GB) ST39236 17,942,583 (111C837h) (9.186 GB) ST39226 17,942,583 (111C837h) (9.186 GB) ST39216 17,942,583 (111C837h) (9.186 GB)

Notes.

[1] Sector size se lectable at format time. Users having the necessar y equipmen t may modify the data block

size before issuing a format co mmand and obtain different formatted capa cities than those listed. See Mode Select command and Format command in the SCSI Interface Product Manual, part number

75789509.

[2] User available capacity depends on spa re reallocation scheme se lected. The number of data tracks per

sparing zone and the number of alte rnate sectors (LBAs ) per sparing zone can be deter mined by using the Mode Sense command and reading Mode Page 03h. Total LBAs(h) x 200(h) = total byte capacity.

3.6 Programmable drive capacity

Using the Mode Select command, the drive can change its capacity to something less than maximum. See the Mode Select Parameter List table in the SCS I Interface Product Manual, par t number 7578 9509. Refer to the Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indic ates that the drive shall not change the capacity it is curr ently form atted to have. A number in the number of blocks field that is less than the ma ximum number of L BAs changes the total drive capacity to the value in the block descriptor number of blocks field. A value of FF FF FF FF in the number of blocks field restores the drive capacity to the maximum capacity.

3.7 Factory installed accessories

OEM Standard drives are shipped with the Barracuda 18XL Installation Guide, part number 75789511, and the Safety and Regulatory Agency Specification, part number 75789512, (unless otherwise specified). The factory

also ships with the drive a small bag of jumper plugs used for the J2, J5, and J6 option select jumper headers.

3.8 Options (factory instal led)

All customer request ed options are incorporate d during production or packaged at the manufacturin g facility before shipping. Some of the options available are (not an exhaustive list of possible options):

• Other capacities can be ordered depending on sparing scheme and sector size requested.

• 4 Mbyte optional buffer size.

• Single unit shipping pack. The drive is norm ally shipped in bulk pa ckaging to provide maximum protec tion

against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specify this option.

• The Barracuda 18XL Installation Guide, part number 75789511, and the Safety and Regulatory Agency Specification, p art number 75789 512 , ar e i nclu ded with each standard OEM drive shipped, but extra copies

may be ordered.

3.9 Accessories (user installed)

The following accessories are available.

• Single unit shipping pack.

Barracuda 18XL Product Manual, Rev. B 9

4.0 Performance characteristics

4.1 Internal drive characteristics (transparent to user)

ST318436 ST318426 ST318416 ST39236 ST39226 ST39216

Drive capacity 18.373 18.373 18.373 9.186 9.186 9.186 Gbyte (formatted,

rounded off values) Read/write heads 6 6 6 3 3 3 Bytes/track 213 213 213 213 213 213 Kbytes (average,

rounded off values) Bytes/surface 3,642 3,642 3,642 3,642 3,642 3,642 Mbytes (unformatted,

rounded off values) Tracks/surface (total) 14,384 14,384 14,384 14,384 14,384 14,384 Tracks (user accessible) Tracks/inch 18,145 18,145 18,145 18,145 18,145 18,145 TPI Peak bits/inch 328 328 328 328 328 328 KBPI Internal data rate 195-315 195-315 195-315 195-315 195-315 195-315 Mbits/sec (variable

with zone) Disc rotational speed 7,200 7,200 7,200 7,200 7,200 7,200 r/min ± 0.5% Average rotational

latency 4.17 4.17 4.17 4.17 4.17 4.17 msec Recording code 16/17 16/17 16/17 16/17 16/17 16/17 EPR4

4.2 SCSI performance characteristics (visible to user)*

The values given in Section 4.2.1 apply to all models of the Barracuda 18XL family unless otherwise specified. Refer to Section 9.10 and to the SC SI Interface Product Manual, part number 757895 09, for addition al timing details.

4.2.1 Access time [8]*

Including controll er o verhe ad (wi thout disc onne ct) [1] [4] Drive level (18.373 GB models) Drive level (9.186 GB models)

Read Write Read Write

msec msec Average – Typical [3] 6.0 6.5 6.0 6.5 Single Track – Typical [3] 0.70 0.70 0.70 0.70 Full Stroke – Typical [3] 10.50 11.00 10.50 11.0

4.2.2 Format command execution time (minutes) [1]*

18.373 GB models 9.186 GB models

Maximum (with verify) 30 15 Maximum (no verify) 15 7.5

4.2.3 Generalized performance characteristics

Data buffer transfer rate to/from disc media (one 512-byte sector):

18.373 GB models 9.186 GB models

Min. [4]* 24.7 24.7 MByte/sec Avg. [4] 32.1 32.1 MByte/sec Max. [4] 39.4 39.4 MByte/sec

*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.

10 Barracuda 18XL Product Manual, Rev. B

Data buffer transfer rate to/from disc media: (< 1 track):

18.373 GB models 9.186 GB models

Min. [4] 18.5 18.5 MByte/sec Avg. [4] 23.9 23.9 MByte/sec Max. [4] 29.4 29.4 MByte/sec

SCSI interface data transfer rate (asynchronous, 15 bit SCSI bus) [5]:

Maximum instantaneous 5 Mbytes/sec [6] Maximum average 5 Mbytes/sec [7]

Target sustainable transfer rate:

Average 22 Maximum 25 Minimum 15

Synchronous transfer rate:

16 bit SE I/O data bus models 40 Mbytes/sec (Fast-40 or Ultra-2) 16 bit LVD I/O data bus models 160 Mbytes/sec (Fast-80 or Ultra160) [9]

Sector Sizes:

Default 512 byte user data blocks Variable 512 to 4,096 bytes per sector in multiples of 2 bytes per sector.

If n (number of bytes per sector requested) is odd, then n–1 sectors will be used.

Read/write consecutive sectors on a track Yes Flaw reallocation performance impact (for flaws reallocated at format time using

Negligible

the spare sectors per sparing region reallocation scheme) Command overhead time for head switch in sequential mode

Command overhead time for cylinder switch in sequential mode Command overhead, sequential read, tagged Command overhead, sequential W/R, untagged

918 µsec 918 µsec 8 µsec 8 µsec

Average rotational latency 4.17 msec

Notes for Section 4.2.

[1] Execution time measur ed from receipt of the last Byte of the Co mmand Descriptor Block (CDB) to the

request for a Status Byte Tr ansfer to the Initiator (excluding connect/disconnect).

[2] Maximum times are specified over the worst case conditions of te mperature, voltage margins and drive

orientation. W hen co mpar ing spec ified a ccess times, ca re sh ould be taken to dis tingui sh bet ween typic al access times and maximum acc ess times. The b est compar ison is o btained by syst em benchmar k tests conducted under identical conditions. Maximum times do not include error recovery.

[3] Typical Access tim es are measu red u nder nomina l con ditio ns of temperatur e, voltage, and hor izonta l or i-

entation as measured on a representative sample of drives. [4] Assumes no errors and no sector has been relocated. [5] Rate measured from the start of the first sector transfer to or from the Host. [6] Assumes system ability to support the rates listed and no cable loss. [7] Simulated. [8] Access time = controller overhead + average seek time

Access to data = controller overhead + average seek time + latency time [9] ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

Barracuda 18XL Product Manual, Rev. B 11

4.3 Start/stop time

After DC power at nominal voltage has been applied, the drive typically becomes ready for media access commands within 15 se conds if the Mot or Start Option is disabled ( i.e. the motor st ar ts as soon as the power has been applied). Maximum is 25 seconds. If a recoverable error condition is detected dur ing the s tar t s equenc e, the drive executes a recovery procedure whic h may cause the time to bec ome ready to exceed 15, but to become ready within 25 seconds. Duri ng spin up to ready time, the drive responds to some comma nds over the SCSI interface in less than 1.5 second s afte r applic ation of power. Stop time is typicall y <10 se conds from removal of DC power. Maximum is <20 seconds.

If the Motor Star t Option is en abled, the inter nal con troller acc epts the co mmands li sted in the SCSI Interface Product Manual le ss than 3 seconds after DC power has been app lied. After the Motor Star t Command has been received the drive becomes r eady for normal operation s within 13 seconds typically (excluding an error recovery procedure). The Mo tor Start Comm and can also be used to comm and the drive to stop the spindle (see SCSI Interface Product Manual, part number 75789509).

There is no power control switch on the drive.

4.4 Prefetch/multi-segmented cache control

The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when it is used in “cache” operations. To selec t prefetch and cache features the host sends the Mode Select command with the proper values in the applicable bytes in Mode Page 08h (see SCSI Int erface Product Manual, part number 75789509). Prefetch and cache operation are independent features from the standpoint that each is enabled and disabled independently via the Mode Select command. However, in actual operation the prefetch feature overlaps cache operation somewhat as is noted in Section 4.5.1 and 4.5.2.

All default cache and prefetch Mode pa rameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Table 9a.

4.5 Cache operation

The buffer can be divided into logical s egments (Mode Se lect Page 08h, byte 13) from whi ch data is read an d to which data is written. The dri ve mai ntains a ta ble of lo gic al block disk med iu m addre ss es of the data store d in each segment of t he buffer. If cache operation is enabled (RC D bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI Interface Product Manual, pa rt number 75789509 ), da ta r eq ueste d by the ho st wi th a Re ad command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer segments during disc medium read op eration s (disreg ardin g Prefetch opera tion for the moment ). Th at is, the dr ive does not check in the buffer segments for the reque sted read data, but goe s directly to the medium to retr ieve it. The retrieved data merely passes through some buffer segment on the way to the host. On a cache “miss”, all data transfers to the host are in accordance with “buffer-full” ratio rules. On a cache “hit” the drive ignores the “buffer-full” ratio rules. See explanations assoc iated with Mo de pa ge 02h (dis conne ct/re conne ct cont rol) in th e SCSI Interface Product Manual, part number 75789509.

The following is a simplified description of a read operation with cache operation enabled:

Case A -

1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LB’s that are alre a dy in

2. When a reque ste d LB is reached that is no t in any cache segm ent, th e dr ive fetches i t and any remai ning

3. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.

A Read command is received and the first logical block (LB) is already in cache:

the cache. This data may be in multiple segments.

requested LBs from the disc an d puts them in a s egment of the cache. The dr ive transfers the remainin g requested LBs from the ca che to t he host in accorda nce with the disconn ect/r econn ect speci fication mentioned above.

Case B -

1. The drive fetches the reque sted LB’s from the disc and transfers them into a segme nt, and from there to

2. If the prefetch feature is enabled, refer to Section 4.5.2 for operation from this point.

A Read command requests data, the first LB of which is not in any segment of the cache:

the host in accordance with the disconnect/reconnect specification referred to in case A.

12 Barracuda 18XL Product Manual, Rev. B

Each buffer segment is actually a s elf-contained circular storage (wrap-around oc curs), the length of which is an integer number of disc medium sectors. The wrap-around capability of the individual segments greatly enhances the buffer’s over all performance as a cache storage, allowing a wide range of user selectable configurations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled (see Section 4.5.2). The number of se gments may be sele cted using th e Mode Sel ect comma nd, but the size can not be direct ly s elec ted. S ize is s elect ed onl y as a by-pro duct of se lecting the segment numb er spec ific ation. The size in Kbytes of each segment is not reported by the Mode Sense command page 08h, bytes 14 and

15. The value 0XFFFF is always reported. If a size specification is sent b y the host in a Mode Select co mmand (bytes 14 and 15) no new segment size is set up by the d rive, and if the “STRICT” bit in Mode page 00h (byte 2, bit 1) is set to one, the dr ive responds as i t does for any attempt to cha nge unchang eable parameters (se e SCSI Interface Product Manual, par t number 7578950 9). The drive suppor ts op eration of any integer number of segments from 1 to 16.

4.5.1 Caching write data

Write caching is a wr ite op eration by the dr ive that makes use of a drive buffer storage area where the data t o be written to the medium is stored in one or more segments while the drive performs the write command.

The same buffer space and segmentation is used as set up for read functions. The buffer segmentation scheme is set up or cha nged independently, having nothing to do with the state of RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that are to be written are already stored in the cac he from a previous read or write comman d. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.

If the number of wri te data lo gical blocks exceeds t he size of t he segme nt being w ritte n into, when the end o f the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that was written there at the beginning of the operation. However, the drive does not overwrite data that has not yet been written to the medium.

If write caching is enabled (WCE=1), then the drive may return GOOD status on a write command after the data has been transferred into the cache, but before the data has been written to the medium. If an error occurs while writing the data to the medium, and GOOD status has already been returned, a deferred error will be generated. Write commands that have returned GOOD status but still have uncommitted data in the cache are treated similarly to a normal queued command and therefore occupy a command queue slot. This may temporarily reduce the number of commands that may be queued by the host until the write data has been written to the medium.

The Synchronize Cache command may be used to force the drive to write all cached write data to the medium. Upon completion of a Synchronize Cache command, all data received from previous write commands will have been written to the medium. The Star t/Stop command with the stop bit s et will force a sync cache operat ion before the drive stops.

Table 9a shows Mode default settings for the drives.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in conti guous lo gical blocks on the disc i mmedia tely b eyond that which was requested by a Read comman d can be retri eved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that request those logical blocks (this is true even if “cache” operation is disabled). Though the pr efetch operation uses the buffer as a “cache”, finding the requested dat a in the buffer is a prefetch “hit”, not a “cache” operation “hit”. Prefetch is enabled using Mod e Select pa ge 08h, byte 12, bit 5 (Disable Read Ahe ad - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data already in some buffer segment(s), the host can lim it the amount of prefetch data to optim ize system performance. Th e max pre fetch field (bytes 8 and 9) limits th e amount of pr efetch. The dri ve does not use the prefetch “ceiling” field (bytes 10 and 11).

During a prefetch operation, the dri ve crosses a cyl inder bounda r y to fetch more data o nly if the Discontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

4.5.3 Optimizing cache performance for desktop and server applications

Desktop and server applications require different drive caching operations for optimal performance. This means it is difficult to provide a single configuration that meets both of these needs. In a desktop environment,

Barracuda 18XL Product Manual, Rev. B 13

you want to configure the cache to r espond quickly to repetiti ve accesses of multiple s mall segments of dat a without taking th e tim e to “lo ok a head” to the next contiguous segments of data. In a ser ver environment, you want to configure the cac he to provide large volumes of sequential data in a non-repetitive manner. In this case, the ability of the cache to “look ahead” to the next contigu ous segments of sequent ial data is a good thing.

The Performance Mode (PM) bit contr ols the way the drive switches the cache buffer into different modes o f segmentation. In “server mode” (PM bit = 0), the drive can increase the number of cache buffer segments above the value defined in Mode Page 8, Byte 13, as neede d to o ptim ize the perfor ma nc e, based on the command stream from the host. In “desktop mode” (PM bit = 1), the number of segments is maintained at the value defined in Mode Page 8, Byte 13, at all times. For additional inform ation about the PM bit, refer to the Unit Attention Parameters page (00h) of the Mode Sense com ma nd (1 Ah) i n the SCS I In terface Manual, pa rt number 75789509.

The base cache buffer configuration for desktop o r server environments needs to be set co rrectly by the host system. This involves setting the PM bit in M ode Page 0, Byte 2, as well as the numbe r of cache buffer segments in Mode Page 8, Byte 13. The firm ware default values are set to desktop mode (PM bit = 1), and the number of cache buffer segments set to 1 6 (10h). The OE M saved values for drives with LW, W, and N interfaces are the same as the firmware default values. For drives with the LC interface, the OEM saved values are changed to server mod e (PM bit=0), and the number of cache buffer segments are set to 3 (03h) . Refer to Tables 9a through 9f in S ection 9.3.2 for drive default values for the PM bit in Mode Page 0, Byte 2 and the number of cache buffer segments in Mode Page 8, Byte 13.

Caching Parameters page (08h) Byte 13 (Number of Cache Segments)

Desktop mode 10h (16 segments -- default for LW, W, and N models) Server mode 03h (3 segments -- de fault for LC models)

Unit Attention Parameters page (00h) Byte 2, Bit 7 (PM bit)

1 0

14 Barracuda 18XL Product Manual, Rev. B

Barracuda 18XL Product Manual, Rev. B 15

5.0 Reliability specifications

The following reliability spe cifications assume correct hos t/drive operational interface, including all interface timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).

Seek Errors

Less than 10 in 10

Read Error Rates [1]

Recovered Data Less than 10 errors in 10 Unrecovered Data Less than 1 sector in 10

Miscorrected Data Less than 1 sector in 10 MTBF 1,200,000 hours Service Life 5 years Preventive Maintenance None required

Note.

[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

5.1 Error rates

The error rates stated in this specification assume the following:

• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).

• The drive has been formatted with the SCSI FORMAT commands.

• Errors caused by media d efects or hos t system failures are exclude d from er ror rate comp utat ions. Refer to

Section 3.2, “Media Characteristics.”

seeks

bits transferred (OEM default settings)

bits transferred

5.1.1 Environmental interference

When evaluating systems operatio n under condit ions of Ele ctromagnetic Interference (EMI), the performanc e of the drive within the s ystem shall b e consi dered acce ptable if the dr ive does not g enerate an unre coverable condition.

An unrecoverable error, or unrecoverable condition, is defined as one that:

• Is not detected and corrected by the drive itself;

• Is not capable of being detected from the error or fault status provided through the drive or SCSI interface; or

• Is not capable of being recovered by normal dr ive or sys tem rec overy pro cedur es wit hou t opera tor inte rven-

tion.

5.1.2 Read errors

Before determination or measurement of read error rates:

• The data that is to be used for measurement of read error rates must be verified as being written correctly on the media.

• All media defect induced errors must be excluded from error rate calculations.

5.1.3 Write errors

Write errors can occur as a result of media defects, environmental interference, or equipment malfunction. Therefore, write errors are not predictable as a function of the number of bits passed.

If an unrecoverable write error occurs beca use of a n equipm ent mal functi on in the dr ive, the error is classi fied as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected within two attempts at writing the record with a read verify after each attempt (excluding media defects).

16 Barracuda 18XL Product Manual, Rev. B

5.1.4 Seek errors

A seek error is de fin ed as a failure o f t he drive to position the h eads to t he add re ss ed track. Th ere sh all b e no

more than ten recoverable seek errors in 10

physical seek operations. After detecting an init ia l se ek err or, the drive automatically p erforms an error rec overy process. If the error recovery process fails, a seek pos itioning error (15h) is repor ted wit h a Medium err or (3h) or Har dware error (4h) repo rt ed in the Sense Key. This is an unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculatio ns. Refer to to the SCSI Interface Product Manual, part number 75789509, for Request Sense information.

5.2 Reliability and service

You can enhance the re liability of Barracuda 18XL disc dr ives by ensuring that th e drive receives adequate cooling. Section 6.0 pr ovides temperature me asureme nts and other in formation th at may be used to enhance the service life of the drive. Section 8.3.1 provides recommended air-flow information.

5.2.1 Mean time between failure

The production d isc drive shall achieve an MTBF o f 1,200,000 hours when operated in an environment that ensures the case temperatures specified in Section 6.4.1, Table 3, Column 2 are not exceeded. Shor t-term excursions up to the specification limits of the operating environment will not affect MTBF performance. Continual or sustained operation at cas e temperatures above the values shown in Table 3, Column 2 may degrade product reliability.

The following expression defines MTBF

Estimated power-on operating hours in the per i od

MTBF per measurement period =

Number of drive failures in the period

Estimated power-on operation hours means power-up hours per disc drive times the total number of disc drives in servic e. Each dis c dr ive shal l have accumulated a t leas t nine month s of o peration. Data sha ll be calc ulated on a rolling average base for a minimum period of six months.

Drive failure means any stoppage or substandard performance caused by drive malfunction.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance shall be required.

5.2.3 Service life

The drive shall have a useful ser vic e life of five years. Depot repair or repl aceme nt of maj or parts is per m itted during the lifetime (see Section 5.2.4).

5.2.4 Service philosophy

Special equipmen t is requir ed to repair the drive HDA. In order to achi eve the above service life, repairs must be performed only at a proper ly equip ped and staffed ser vice and repair facility. Troubleshooting and repair of PCBAs (Printed Circuit Board Assemblies) in the field is not recommended, because of the extensive diagnostic equipment requ ired for effective servi cing. Al so, there are n o spa re p ar ts available for this drive. Drive warranty is voided if the HDA is opened.

5.2.5 Service tools

No special tools are requi red for site instal lat ion or recomm ended for site maintenance. Refer to Section 5.2.4. The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not practical since there are no user purchasable parts in the drive.

Barracuda 18XL Product Manual, Rev. B 17

5.2.6 Hot plugging Barracuda 18XL disc drives

The ANSI SPI-3 (T10 /1302D) documen t defines the physical requi rements for removal and inser tion of SCS I devices on the SCSI bus. Four cases are addressed. The cases are differentiated by the state of the SCSI bus when the removal or insertion occurs.

Case 1 All bus devices powered off during removal or insertion Case 2 RST signal asserted continuously during removal or insertion Case 3 Current I/O processes not allowed during insertion or removal Case 4 Current I/O process allowed during insertion or removal, except on the device being changed

Seagate Barracuda disc drives support all four hot plugging cases. Provision shall be made by the system such that a device being inser ted ma kes power and ground connecti ons prior to the connection of any device signal contact to the bus. A device being rem oved shall mai nta in p ower and gr oun d c onn ect ion s after th e d isco nne ction of any device signal contact from the bus (see SFF-8046, SCA-2 specification).

It is the responsibility of the systems integrator to assure that no hazards from temperature, energy, voltage, or ESD potential are presented during the hot connect/disconnect operation.

All I/O processe s for the SCSI device bein g inser ted or removed shall b e quiescent. A ll SCSI devices on th e bus shall have receivers that conform to the SPI-3 standard.

If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage differential (LVD ) mode, then all I/O proc esses for all devices on the bus must be compl eted, and the bus quiesced, before attempting to hot plug. Following the insertion of the newly installed device, the SCSI host adapter must issue a Bus Res et, followed by a synchronous transfer negotiation. Failure to perform the SCSI Bus Reset could result in erroneous bus operations.

The SCSI bus termination and termination power source shall be external to the device being inserted or removed.

End users should not mix devices with high voltage differential (H VD) drivers and receivers and devices wit h SE, LVD, or multimode drivers and receivers on the same SCSI bus since the co mmon mode voltages in the HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-3).

The disc drive spindle must co me to a complete st op prior to comple tely removing the dr ive from the cabinet chassis. Use of the Stop Spin dle co mmand o r partial withdrawal of the dr ive, enough to be disc onnected f rom the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion, care should be taken to avoid exceeding the limits stated in Section 6 .4.4, "S hock and vibration," of this manual.

5.2.7 S.M.A.R.T.

S.M.A.R.T. is a n acronym for Self- Monitor ing Anal ysis and Repor ti ng Technology. T his te chnology is inte nded to recognize conditions that indi cate a dri ve failure and is designed to provide suffic ient war ning of a failure to allow data back-up before an actual failure occurs.

Note.

Each attribute ha s bee n s el ec ted to mo nit or a sp ec ifi c s et of failure conditions in the op erating pe rfor ma nc e o f the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.

Controlling S.M.A.R.T.

The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bi t of the “Informational Exceptions Control Mo de Page” (1Ch). The DEXCPT bit is us ed to enable or disable the S.M.A.R.T. process. Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data as the drive performs nor m al re ad/wr ite operatio ns. When t he PER F bit is set, th e dr ive is consi dered to be in “On-line Mode Only” and will not perform off-line functions.

The firmware will monitor specific attributes for degradation over time but cannot predict instantaneous drive failures.

The process of measuri ng off-line attributes and saving data can be forced by the RTZ (return to zero) command. Forcing S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.

18 Barracuda 18XL Product Manual, Rev. B

The drive can be interrogated by the host to determine the time remaining before the next scheduled measurement and data loggi ng process will oc cur. This is accomplished by a log sense command to log page 0x3E . The purpose is to allow the customer to control when S.M.A.R.T . interruptions occur. As described above, forcing S.M.A.R.T by the RTZ command will reset the timer.

Performance impact

S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predictive failure. The drive will measure and save parameters once every two hours subject to an idle per iod on the SCSI bus. The process of m easuring off-line attr ibute data and saving data to th e disc is u ninterrup table and the maximum delay is summarized below:

Maximum processing delay

On-line only delay Fully enabled delay DEXCPT = 0, PERF = 1 DEXCPT = 0, PERF = 0

S.M.A.R.T. delay times, 18.373 Gb models 160 milliseconds 300 milliseconds S.M.A.R.T. delay times, 9.186 Gb models 110 milliseconds 200 milliseconds

Reporting control

Reporting is controlled in the “Informational Exceptions Contro l Page” (1Ch). Subj ect to the reporting method , the firmware will issue to the “host” an 01-5D00 sense code. The error code is preser ved through bus resets and power cycles.

Determining rate

S.M.A.R.T. monito rs the rat e at whic h error s occu r and signals a pred ictive failure if the rate of degrade d error rate increases to an una cc ept able level. To det ermine rate, error events are logged and c omp ared to the number of total operations for a given attr ibute. The inter val defines the number of operations over which to m easure the rate. The counter that keeps track of the c urrent number of operations is referred to as the I nterval Counter.

S.M.A.R.T. measures error rate, hence for each attribute the occurren ce of an “error” is recorded. A counter keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.

Error rate is simply the number of errors per ope ration. The algorithm that S.M.A.R.T. uses to recor d rates of error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold before the interval expires, then the error rate is cons idered to be u nacceptable. If the numbe r of errors d oes not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In either case, the interval and failure counters are reset and the process starts over.

Predictive failures

S.M.A.R.T. signals predicti ve failures when the dr ive is perform ing una cceptably for a peri od of tim e. The fir mware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counte r is incremen ted whenever the error rate is una cceptable and de cremented ( not to exceed zero) whenever the error rate is acceptable. Should the counter continually be incremented such that it reaches the predictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter. There is a separate Failure History Counter for each attribute.

5.2.8 Drive Self Test (DST)

Drive Self Te st (DST) is a tech nology designed to recognize d rive fault conditions that qu alify the drive as a failed unit. DST validates the functionality of the drive at a system level. If DST encounters an error, it reports a fault condition. If the drive fails the test, remove it from service and return it to Seagate for service.

5.2.8.1 DST Failure Definition

The drive will present a “diagnostic failed” condition throu gh the diagnostic log page if a functional failure is encountered duri ng DST. There is no attempt to raise or lower recovery threshold s or to predict errors. All retries and r ecovery processe s are enabled dur ing the tes t. If data is re coverable, no failure condition will be reported regardless of the retry level required to recover the data.

Barracuda 18XL Product Manual, Rev. B 19

The following conditions are considered DST failure conditions:

• Persistent seek error after retries are exhausted

• Persistent track-follow error after retries are exhausted

• Persistent read error after retries are exhausted

• Persistent write error after retries are exhausted.

Recovered errors will not be reported as diagnostic failures.

5.2.8.2 Implementation

This section provides all of the information necessary to implement the DST function on this drive.

5.2.8.2.1 State of the drive prior to testing

The host is responsible for spinnin g the dri ve before issuing the Send Di agnost ic comman d. While not techn ically part of DST, a persistent Not Ready condition also qualifies the drive to be returned to Seagate as a failed drive.

A Drive Not Ready condition is reported by the drive under the following conditions:

• Motor will not spin

• Motor will not lock to speed

• Servo will not lock on track

• Drive cannot read configuration tables from the disc

A Drive Not Ready will cause the drive to return a check condition with a sense code of 02, an error code of 04, and an ASQC of 00, 01, 02, 03, or 04.

5.2.8.2.2 Invoking DST

To invoke DST, subm it the Se nd Diagnos tic comma nd with the appropr iate F unction Code (001b for the sho r t test or 010b for the extended test) in bytes 1, bits 5, 6, and 7. Refer to the SCSI Interface Product Manual, Volume 2, part number 75789509, for additional information about invoking DST.

5.2.8.2.3 Check condition

Fault conditions are repor ted using one of two mechani sms. The two mechani sms are mutually exclusive—a failure reported by a check conditi on will not update the log, and a failed repor t in the log will not produce a check condition.

1. Check Condition status is reported in any of the following cases:

• Command is not valid (sense data xx xx xx),

• Drive is not ready (sense data 02, 04, [ASQC: 00, 01, 02, 03, or 04], and

• The drive is not able to update the log (sense data xx xx xx).

2. Failure Report through the Log Sense command.

5.2.8.2.4 Immediate and non-immediate modes

The host can speci fy when the dr ive retur n s sta tus. Status can be retur n ed at the con clusio n of the c omman d (non-immediate mode) or can be returned immediately (immediate mode). In immediate mode, the nexus completes with good st atus imm ediately a fter the command has bee n validated and t he lo g has been updated. I n non-immediate mode, the drive will disconnect from the bus and reconnect at the conclusion of the command.

5.2.8.2.5 Short and extended tests

DST has two testing options—short and extended. These testing optio ns are described in the following two subsections.

Short test (Function Code: 001b)

The purpos e of t he sho rt test is to p rovide a t ime -lim ited test that tests as much o f the drive as possible within 120 seconds. The shor t test does not scan the e ntire media surface, but does some fundamental te sts and scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a fault condition. This option provides a quick confidence test of the drive. Future revisions of the DST algorithms

20 Barracuda 18XL Product Manual, Rev. B

may improve the effectiveness of the short test to find problems more quickly, but in no case will the drive report a fault condition unless it encounters an actual drive failure.

Each test consists of three segments:

1. Electrical

The drive will read, write, then r ead a s eries of sectors that have been alloca ted in a n on-user- accessible area of the drive. These sectors have been certified at the factory and defective sectors spared. Sequential sectors will be read, written with a different pattern, then re-read. Each head will be exercised and the data pattern used will be unique for each head. If any read or write operation fails after retries, the test fails.

2. Servo

This segment executes 4,500 random reads. If any seek fails after retries, DST classifies this as a failure.

3. Read/verify scan

Beginning with logica l block address (LBA) 0, the drive scans the user data areas. ECC and retries are used and all defect management, including the grown list, is used. The scan continues until the time allowed for the short test has el aps ed . If th e read of any sector produces an er ror, DST classifies thi s as a failure.

Short Test Correlation

The shor t tes t reta ins a c orr ela tio n ra te o f a t l eas t 9 0% with dr i ves tested an d c la ssi fied i n t he factor y, with the exclusion of media defects. The test repor ts as “good” at least 90% of drives judged “good” by Seagate test s and reports as “bad” at least 90% of drives judged “bad” by Seagate tests for reasons other than media defects.

Extended test (Function Code: 010b)

The objective of the extended test option is to empirically test critical drive components. For example, the seek tests and on-track operations test the positioning mechanism. The read operation tests the read head element. and the write element is tested through read/write/read operations. The integrity of the media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of these tests.

The extended option perform s various tests on the dr ive and scans every LBA of the dr ive. The anticipated length of this test is reported through the Mode Control page.

You can selected which test you want to run through the Function Code field of the Send Diagnostic command. Each test consists of three segments:

1. Electrical

2. Servo

This segment performs random seek and read tests. During the random seek test, the drive executes 4500 random seeks. If any of these seeks fail, after retr ies, DST classifies this as a failure. During the random read test, the drive executes 4,500 random reads across the full user-acc essible area of the drive. ECC and retries are used. All defect management, including the grown list, is used. If the read of any sector produces an error, DST classifies this as a failure.

3. Read/verify scan

Beginning with logical block address (LBA) 0 and continuing through the maximum LBA, the drive scans all user data areas. ECC an d ret ries are used and al l defect mana gem ent, in cl udi ng the grown li s t, is us ed. If the read of any sector produces an error, DST classifies this as a failure.

Extended Test Correlation

The extended test retains a corr ela tio n rate of at lea st 90% wi th d rives tested and classified in the factory. T h e test repor ts as “good” at least 90% of the drive judged “good” by Seagate tests and repor ts as “bad” at least 90% of drives judged “bad” by Seagate tests.

Barracuda 18XL Product Manual, Rev. B 21

5.2.8.2.6 Log page entries

When the drive begins DST, it creates a new entry in the Self- tes t Re su lts Lo g pa ge. The new en try is created by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 parameter blocks in the log page. If there are mor e tha n 20 pa rameter blocks, the least r ecen t pa rame ter block will b e deleted. The new parameter block will be initialized as follows:

1. The Function Code field is set to the same value as sent in the DST command.

2. The Self-Test Results Value field is set to Fh.

3. The drive will store the log page to non-volatile memory. After completing th e fir st two sel f-tes t segmen ts, the dr ive will change the value in the Self- Test Results Value

field to Eh, update the log page in non -volatile memory with th is new value, and begin the third self-test segment. Only the Self-Test Results Value field is changed as a result of this update.

After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its SelfTest Results Log pag e i n no n- volatile me mory. The host may use Log S ense to read the results from up to the last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the test. If the field is zero, the drive passed with no errors detected by the DST. If the field is not zero, the test failed for the reason reported in the field.

5.2.8.2.7 Self-Test Progress Indicator

Self-test progress is reported through the Request Sense command with the Self-Test Progress Indicator (STPI) bit set.

5.2.8.2.8 Abort

There are several ways to abort a diagnostic. Power-on Reset and SCSI Rese t are two mechanisms you can use. You can also i ssue a Send Diagno stic command with an abor t code in the functi on field to abor t a currently-executing diagnostic. The log data will report an aborted command.

5.2.9 Product warranty

Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that each product (including components and subassemblies) or spare part that fails to function properly under normal use due to defect in mater ials on work mans hip or du e to nonc onform ance t o the app lica ble specific ations will be repaired or replaced, at Seagate’s option an d at no ch ar ge to c ustomer, if returned by customer at cu stomer’s expense to Seagate’s designated facility in accordance wi th Seagate’s Warranty Procedure. Seagate will pay for transporting th e repair or replacement it em to customer. For more detailed warranty information refer to the Standard terms and conditions of Purchase for Seagate products.

Shipping

When transpor ting or shipping a dr ive, a Seagate approved container must be used. Keep your origina l box. They are easily identifi ed by the Seagate Approved Package label. Shipping a dr ive in a non-approved container voids the drive warranty.

Seagate repair centers may refuse receip t of compon ents imp roper ly pa ckaged or obviously damaged in transit. Contact your Authorized Seaga te Dis tr ibutor to pur chase addition al boxes. Seagate recommends ship ping by an air-ride carrier experienced in handling computer equipment.

Product repair and return information

Seagate customer se rvice centers are the only facilities author ized to service Seagate drives. Seagate does not sanction any third-par ty repair facilities. Any unauthorized repai r or tampering with the factory- seal voids the warranty.

22 Barracuda 18XL Product Manual, Rev. B

Barracuda 18XL Product Manual, Rev. B 23

6.0 Physical/electrical specifications

This section provide s informatio n relating to the physical and electr ical character istics of the Barracud a 18XL drive.

6.1 AC power requirements

None.

6.2 DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply at the drive power connector. The single ended power requirements includes the internal disc drive SCSI I/O termination. The table shows current values in Amperes. See also Figure 3c for current values vs. number of I/O operations.

Table 2: DC power requirements

ST318436 ST318426 ST318416

18.373 GB drives Notes

Voltage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V Regulation [5][2] ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% Average idle current DCX

[1] 0.80 0.30 0.80 0.30 0.80 0.30 0.80 0.30

Maximum starting current

(peak DC) (peak AC)

[3]

[3] Delayed motor start (max) DC [1][4] 0.70 0.05 0.70 0.05 0.70 0.05 0.70 0.05 Peak operating current

Typical DCX Maximum DC

[1][6]

[1]

Maximum (Peak)

LW/LC–LVD LWV/LCV–LVD LW/LC–LVD N/W–SE

1.0 2.4

2.7

0.90

1.10

1.60

0.60

0.70

2.50

1.0 2.4

2.7

0.90

1.10

1.60

0.60

0.70

2.50

1.0 2.4

2.7

0.90

1.10

1.60

0.60

0.70

2.50

1.0 2.4

0.90

1.10

1.60

2.7

0.60

0.70

2.50

ST39236 ST39226 ST39216

9.186 GB drives Notes

LW/LC–LVD LWV/LCV–LVD LW/LC–LVD N/W–SE

Voltage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V Regulation [5][2] ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% Average idle current DCX

[1] 0.80 0.25 0.80 0.25 0.80 0.25 0.80 0.25 Maximum starting current

(peak DC) (peak AC)

[3]

1.0 1.7

2.4

1.0 1.7

2.4

1.0 1.7

2.4

1.0 1.7

2.4 Delayed motor start (max) DC [1][4] 0.70 0.05 0.70 0.05 0.70 0.05 0.70 0.05 Peak operating current

Typical DCX Maximum DC Maximum (Peak)

[1][6] [1]

0.90

1.00

1.40

0.50

0.80

2.30

0.90

1.00

1.40

0.50

0.80

2.30

0.90

1.00

1.40

0.50

0.80

2.30

0.90

1.00

1.40

0.50

0.80

2.30

Notes.

[1] Measured wi th average reading DC ammeter. Instantaneous +12 V curr ent peaks will exceed thes e val-

ues. Power supply is at nominal voltages.

[2] For +1 2 V, a –10% droop is permissible during initial start of spindle, and must return to ±5% before 7,200

rpm is reached. T he ±5% must be maintained after the drive signifies that its power-up seque nce has

been completed and that the drive is able to accept selection by the host initiator. [3] See +12 V current profile in Figu re 3a. [4] This co ndition occurs when the Mo tor Star t Opti on is enabled an d the dr ive has not yet received a Star t

Motor command.

24 Barracuda 18XL Product Manual, Rev. B

[5] See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance i s inclusive of ripple, noise,

and transient response.

[6] Operating condition is defined as random 8 block reads at 162 I/Os per second. Current and power speci-

fied at nominal voltages. Decreasing +5 V supply by +5% increases 5 V current by 2.31%.

General Notes from Table 2:

1. Minimum curren t loading for each supply voltage is not les s than 4% of the maximum operating current shown.

2. The +5 and +12 volt supplies shall employ separate ground returns.

3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.

6.2.1 Conducted noise immunity

Noise is specified as a periodi c and random distribution of frequencie s covering a band from DC to 10 MHz. Maximum allowed noise values given below are peak to peak measurements and apply at the drive power connector.

+5 V = 250 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

+12 V = 250 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

6.2.2 Power sequencing

The drive does not requir e power sequencing. T he drive protects aga inst inadver tent wr iting dur ing power-up and down. Daisy-chain operation re quires tha t power be mai ntained on the ter min ated dr ive to ensur e proper termination of the peripheral I/O ca bles. To automatically delay motor start b ased on the target ID (SCS I ID) enable the Delay Motor Start op tion and disable the Ena ble Motor Star t opti on on the J2 con nector. See Section 8.1 for pin selection inform ation. To delay the motor until the drive receives a Start Unit comma nd, enable the Enable Motor Start option on the J2 connector.

Barracuda 18XL Product Manual, Rev. B 25

6.2.3 Current profile

Figures 3a and 3b i dentif y the d r ive +5 V and + 12 V c urrent profi le. The curr ent dur i ng the various t imes is as shown:

T - Power is applied to the drive. T1 - Controller self tests are performed. T2 - Spindle begins to accelerate under current limiting after performing drive internal

diagnostics. See Note 1 of Table 2. T3 - The heads move from the landing zone to the data area. T4 - The adaptive servo calibration sequence is performed. T5 - Calibration is complete and the drive is ready for reading and writing.

Note.

All times and currents are typical. See Table 2 for maximum current requirements.

+12 Volt Current during spindle start – Typical Amperes

3.0

2.5 AC Envelope

2.0

Nominal (average) DC curve

1.5

1.0

0.5

0.0

T1 T3

0.0 2 4 6 8 10 12 14 16 18 20

Seconds

Figure 3a. Typical Barracuda 18XL family drive +12 V current profile

26 Barracuda 18XL Product Manual, Rev. B

+5 Volt Current, SCSI SE, during spindle start – Typical Amperes

1.2

1.0

0.8

0.6 A

0.4

0.2

0.0

T1 T3

0.0 2 4 6 8 10 12 14 16 18 20

Seconds

Figure 3b. Typical Barracuda 18XL family drive +5 V current profile

Barracuda 18XL Product Manual, Rev. B 27

6.3 Power dissipation

To obtain drive typical operating random read (8 blocks) power dissipation at nominal voltages, refer to Figures 3c and 3d. The dr ive user can decide for themselves what number of I/O op eratio n s con sti tute s a typi cal number of I/O operations for their installatio n. Multiply Watts times 3.4123 to obtai n BTUs per hour. Typical power dissipation under idle conditions for LVD models is 6.9 Watts (23.54 BTUs per hour).

5V A 12V A Watts

Watts

5V A 12V A Watts

1.2

1.0

0.8

0.6

Amperes

0.4

0.2

0.0 4 6 11 16

Figure 3c. DC current and power vs. input/output operations per second for ST318436 drives (LVD only)

1.2

1.0

24 34 46 84 122 164

I/Os per Second

0.8

0.6

Amperes

0.4

0.2

0.0 8122131

Figure 3d. DC current and power vs. input/output operations per second for ST39236 drives (SE only)

46 63 84 135 161 165

I/Os per Second

Watts

28 Barracuda 18XL Product Manual, Rev. B

6.4 Environmental limits

Temperature an d hu mi dity values experi enc ed by the d rive must be such that cond ensati on doe s not occur on any drive part. A ltitude and atmospher ic pressure specificat ions are referenced to a standa rd day at 58.7°F (14.8°C). Maximum Wet Bulb temperature is 82°F (28°C).

6.4.1 Temperature

a. Operating

With cooling designed to ma intain the ca se temperatur es of Table 3, Column 2, the drive meets all specifications over a 41°F to 131°F (5°C to 55°C) drive ambient temperature range with a maximum temperatur e gradient of 36°F (20°C) per hour. The enclosu re for the drive should b e designed such that the temperatures at the locations sp ecified in Table 3, column 1 are not exceeded. A ir flow may be needed to achieve these temperature values (see Section 8. 3 and 8.3.1 ). Ope rati on at cas e tem pera tures [4] ab ove these values may adversely affect the drives ability to meet specifications.

The MTBF specification for the drive is based on operating in an environment th at ensures that the case temperatures specified in Table 3, column 2 are not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or 41°F (5°C) may occur withou t impact to specified MTBF. Air flow may be needed to achieve these temperatures (see Se ction 8.3.1). Continual o r sustained operati on at case temperatures above these values may degrade MTBF.

To confirm that the required cooling for the Barracuda electronics and HDA is provided, place the drive in its final mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure the case temperature of the components listed in Table 3 (see notes [2] and [3]).

Operation of the drive at the maximum case temperature is intended for short time periods only . Continuous operation at the elevated temperatures will reduce product reliability.

Table 3: PCBA (Printed Circuit Board Assembly) and HDA temperatures

Items in Figure 4

Column 1 Maximum case [4] temperatures (°C) operating (55° ambient) [2]

Column 2 Maximum allowable case [4] temperatures (°C) [5] to meet MTBF spec.

HDA [3] 65°C45°C U5 123°C103°C U2 123°C103°C U8 105°C85°C U11 105°C85°C

Note.

[1] Section 8.3.1 describes the air-flow patter ns to be used to meet case temperatu res in column 2. Air

flow should be opposite that shown in Section 8.3.1. Air velocity should be adequate to ensure that the case temperatures in Column 2 are not exceeded during drive operation.

[2] The temperatures in Column 1 are calculated and may not reflect actual operating values. Sufficient

cooling air may be required to ensure that these values are not exceeded. [3] Measure HDA temp at point labeled “HDA” on Figure 4. [4] PCBA mounted integrated circuit case. [5] Temperatures measured under 22.5°C ambient conditions.

b. Non-operating

–40° to 158°F (–40° to 70°C) package ambient w ith a maximum gradient of 45°F (25°C) per hour. This specification assumes that the drive is packaged in the shipping container designed by Seagate for use with drive.

Barracuda 18XL Product Manual, Rev. B 29

Model “LC” PCBA [1]

U11

U15

U16

HDA Temp.

Check Point

U15

U16

.5"

Model “N” PCBA [1]

U11

U18

U19

PCBA 3

Model “W/LW” PCBA [1]

U11

U15

U16

U18

U19 U19

PCBA 1

[1]Bottom side of PCBA

Figure 4. Locations of PCBA components listed in Table 3

U18

PCBA 2

30 Barracuda 18XL Product Manual, Rev. B

6.4.2 Relative humidity

The values below assume that no condensation on the drive occurs. a. Operating

5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour.

b. Non-operating

5% to 95% non-condensing relative humidity.

6.4.3 Effective altitude (sea level)

a. Operating

–1,000 to +10,000 feet (–300 to +3,000 meters)

b. Non-operating

–1,000 to +40,000 feet (–300 to +12,200 meters)

6.4.4 Shock and vibration

Shock and vibration limits spec ified in this documen t are mea sure d dire ctly on the dr i ve chassis. If the dr ive is installed in a n enclosu re to whic h the stat ed shock and/o r vibratio n criter ia is applied, resonance s may occur internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent, it may be necessary to modify the enclosure to minimize drive movement.

The limits of sho ck and vibration de fined within this document are speci fied with the drive mounted by any o f the four methods shown in Figure 5, and in ac cordance wit h the restricti ons of Sectio n 8.4. Orient ation of the side nearest the LED may be up or down.

6.4.4.1 Shock

a. Operating—normal

The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). Shock may be applied in the X, Y, or Z axis.

b. Operating—abnormal

Equipment, as installed for normal operation, does not incur physical damage while subjected to inter mittent shock not exceeding 15 Gs at a maximum duration of 11 msec ( half sinewave). Shock occurring a t abnormal levels may promote degraded operational performance during the abnormal shock period. Specified operational performance will continue when normal operating shock levels resume. Shock may be applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.

c. Non-operating

The limits of non- operating shock shal l appl y to all c onditi ons of h andlin g a nd transpo rtation. This inc ludes both isolated drives and integrated drives.

The drive subjected t o nonrep etitive shock not exceeding 150 G s at a m aximum du ration of 11 msec (half sinewave) shall not exhibit device damage or performan ce degradati on. Shock may be appl ied in the X, Y, or Z axis.

The drive subjected to nonrepeti tive shock not exceeding 250 Gs at a maximum duration of 2 msec (half sinewave) does not exhibit device damage or performance degradation. Sh ock may be applied in the X , Y, or Z axis.

Barracuda 18XL Product Manual, Rev. B 31

d. Packaged

Disc drives shipped as lo ose load ( not pall etized) general fr eight will b e packaged to withs tand drop s from heights as defined in the table below. For additional details refer to Seagate specifications 30190-001 (under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).

Package size Packaged/product weight Drop height

<600 cu in (<9,800 cu cm) Any 60 in (1524 mm) 600-1800 cu in (9,800-19,700 cu cm) 0-20 lb (0 to 9.1 kg) 48 in (1219 mm) >1800 cu in (>19,700 cu cm) 0-20 lb (0 to 9.1 kg) 42 in (1067 mm) >600 cu in (>9,800 cu cm) 20-40 lb (9.1 to 18.1 kg) 36 in (914 mm)

Y X

Figure 5. Recommended moun ting

32 Barracuda 18XL Product Manual, Rev. B

6.4.4.2 Vibration

a. Operating - normal

The drive as installed for normal operation, shall comply with the complete specified performance whil e subjected to continuous vibration not exceeding

5-22 Hz @ 0.045 inches (1.12 mm) displ ace ment

22-300 Hz @1.1 G

300-350 Hz @ 0.83 G Vibration may be applied in the X, Y, or Z axis.

b. Operating - abnormal

5-22 Hz @ 0.061 inches (1.12 mm) displ ace ment

22-300 Hz @ 1.5 G (X, Y, or Z axis)

300-350 Hz @ 1.125 G

c. Non-operating

The limits of non-operating vibration shall apply to all conditions of handling and transportation. This includes both isolated drives and integrated drives.

The drive shall not incur physical dama ge or degraded performan ce as a resu lt of continuous vi bration not exceeding

5-22 Hz @ 0.100 inches (2.5 mm) displacement

22-400 Hz @ 2.5 G Vibration may be applied in the X, Y, or Z axis.

6.4.5 Air cleanliness

The drive is designed to operate in a typical office environment with minimal environmental control.

6.4.6 Acoustics

Sound power during idle mode shall be 3.5 (mean) bels typical when measured to Seagate’s 30553-001 specification.

6.4.7 Electromagnetic susceptibility

See Section 2.1.2.

Barracuda 18XL Product Manual, Rev. B 33

6.5 Mechanical specifications

The following nominal dimensions are for inform atio n on ly. Refer to Figures 6a and 6c for detailed (toleranced) mounting configuration dimensions. See Section 8.4, “Drive mounting.”

Height: 1.000 in 25.4 mm Width: 4.000 in 101.6 mm Depth: 5.75 in 146.0 5 mm Weight: 1.5 pounds 0.68 kilograms

[2]

[8]

[7]

-Z-V// [1]

-Z-

Notes:

[1]

Mounting holes three on each side, 6-32 UNC. Max screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of

0.12 in. (3.05 mm). Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

[2]

-X-

-X-U

[3] M

[1]

N [5]

J6 LED

P [4]

Power and interface connectors can extend past the “B” dimension by 0.040 in. (1.02 mm).

[3]

Centerline of pad for Pin 1 of power connector.

[4]

Centerline of pad for Pin 1 of J6.

[5]

Dimension “N” is from drive mounting hole to end of drive chasis (not the PCBA).

[6]

Nominal values. These cannot be added to any toleranced dimension to achieve a valid toleranced dimension.

[7]

Maximum connector non-perpendicularity to side planes pointed to by X.

[8]

Maximum amount of non-parallelism with plane -Z-.

Dimension Table

Inches

1.028

5.787

4.000

3.750 E F G H J K L M N P R S T U V

.125

1.750

1.625

1.122

4.000

.250

1.638

.143

2.38

.405

2.265

.315 .278 .015 .015

max max

± .010 ± .010 ± .010 ± .010 ± .020 ± .020 ± .010 ± .010 ± .010 ± .020 ± .005

[6] [6]

± .010 ± .010

max max

Millimeters

26.10

146.99

101.60

95.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

3.63

60.45

10.29

52.53

8.00

7.06

0.38

max

± .25 ± .25 ± .25 ± .25 ± .50 ± .50 ± .25 ± .25 ± .25 ± .50 ± .13

[6] [6]

± .25 ± .25

max max

Figure 6a. Mounting configuration dimensions for “W,” “LW,” and “LWV” model

34 Barracuda 18XL Product Manual, Rev. B

[2]

[10]

[7]

-Z-T// [1]

-Z-

Notes:

Mounting holes three on each side, 6-32 UNC. Max screw length

[1]

into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm). Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement

Pin 1

Connector Centerline

-X-U G [4]

[1]

[9] N

[3]

[7]

-X-

J6 LED

P [6]

of 0.12 in. (3.05 mm). Interface connector is flush with the end of drive within

[2]

±0.020 in. (.5 mm). The interface connector location may extend beyond HDA dimension “B” by 0.020 in. (.5 mm).

Connector J1 is centered (side to side) on drive within ±0.020 in.

[3]

(.508 mm). Dimension “G” is from bottom rear drive mounting holes center(s)

[4]

to the face of the connector at the center of the drive. It is also the dimension to the end of the drive HDA.

Dimensions “G” and “S” are unique requirements for SCA drives

[5]

only, required for conformance with latest SFF Spec #8337. Centerline of pad for Pin 1 of J6.

[6]

Maximum connector non-perpendicularity to side planes pointed

[7]

to by X. Nominal values. These cannot be added to any toleranced

[8]

dimension to achieve a valid toleranced dimension. Dimension “N” is from drive mounting hole to end of drive chasis

[9]

(not to the end of the PCBA). Maximum amount of non-parallelism with plane -Z-.

[10]

Dimension Table

Millimeters

26.10

146.99

101.60

95.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

4.597

60.45

10.29

52.53

8.10 .38 .38

max

± .25 ± .25 ± .25 ± .25 ± .50 ± .50 ± .25 ± .25 ± .25

+ .38 – .25 ± .13 [8] [8] ± .25

max max

[5]

[7]

Inches

1.028

5.787

4.000

3.750 E F

1.750 G

1.625 H

1.122 J

4.000 K L

1.638 M

0.181 N

2.38 P R

2.265 S T U

.125

.250

.405 .319

.015 .015

max max

± .010 ± .010 ± .010 ± .010 ± .020 ± .020 ± .010 ± .010 ± .010

+ .015 – .010 ± .005 [8] [8] ± .010

max max

Figure 6b. Mounting configuration dimensions for “LC” and “LCV” model

Barracuda 18XL Product Manual, Rev. B 35

[2]

[8]

[7]

-Z-U// [1]

-Z-

Notes:

Mounting holes three on each side, 6-32 UNC. Max

[1]

screw length into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm). Mounting holes four on bottom, 6-32 UNC. Max screw length into bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb (.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).

The power interface connectors can extend beyond

[2]

HDA dimension “B” by 0.040 in. (1.02 mm).

-X-T

[6] N

-X-

[3] M

[1]

J6 LED

Centerline of pad for Pin 1 of power connector.

[3]

Centerline of pad for Pin 1 of J6.

[4]

Nominal values. These cannot be added to any

[5]

toleranced dimension to achieve a valid toleranced dimension.

Dimension “N” is from drive mounting hole to end of

[6]

drive chasis (not to the end of the PCBA). Maximum connector non-perpendicularity side planes

[7]

pointed to by -X-. Maximum amount of non-parallelism with plane -Z-.

[8]

Dimension Table

Millimeters

26.10

146.99

101.60

95.25

31.75

44.45

41.28

28.50

101.60

6.35

41.60

3.63

60.45

10.29

52.53

8.50 .38 .38

max

± .25 ± .25 ± .25 ± .25 ± .50 ± .50 ± .25 ± .25 ± .25 ± .50 ± .13

[5] [5] ± .25

max max

[5]

Inches

1.028

5.787

4.000

3.750 E F

1.750 G

1.625 H

1.122 J

4.000 K L

1.638 M N

2.38 P R

2.265 S T U

.125

.250 .143 .405 .335

.015 .015

max max

± .015 ± .010 ± .010 ± .010 ± .020 ± .020 ± .010 ± .010 ± .010 ± .020 ± .005

[5] [5] ± .010

max max

P [4] [5]

Figure 6c. Mounting configuration dimensions for “N” models

36 Barracuda 18XL Product Manual, Rev. B

Barracuda 18XL Product Manual, Rev. B 37

7.0 Defect and error management

The drive, as delivered, complies with this specification. The read error rate and specified storage capacity are not dependent upon use of defect management routines by the host (initiator).

Defect and error management in the SC SI system involves the drive internal de fect/error management an d SCSI systems error consid erations (e rrors in co mmunica tions between Initiat or and the dr ive). Tools for use in designing a defect/error management plan are briefly ou tli ned in this sec tio n, wi th r eferences to othe r sec ti ons where further details are given.

7.1 Drive internal defects

During the initial d rive format operati on at the factor y, media defects are identified, tagged as being unusa ble, and their locations rec orded on the drive primar y defects list (referred to as the “P” li st and also as the ETF defect list). At factory format time, these known defects are also reallocat ed, that is, reassigned to a new place on the medium and the l ocation listed in the defects reallocation table. The “P” li st is not alter ed after factory formatting. Locations of defects found and reallocated d uring error r ecovery procedures after drive shipment are listed in the “G” l ist (defects growth list). Th e “P” and “G” lists may be referenced by the initiator using the Read Defect Data command (refer to the SCSI Interface Product Manual, part number 75789509).

7.2 Drive error recovery procedures

Whenever an error occurs during dr ive operation, the drive, if programmed to do so, performs error recovery procedures to attempt to recover the data. The error recovery procedures used de pend on the option s previously set up in the error recovery pa rame ters m ode page. Erro r rec overy and de fect manageme nt may involve the use of several SCSI commands, the details of which ar e descr ibed in t he SCSI Inte rface Product Manual . The drive implements selectable error recovery time limits such as are required in video applications. For additional information on th is, refer to the Error Re covery Page table in the SCSI Interface Product Manual , which describes the Mode Sele ct/ Mod e Sens e Erro r Recovery param ete rs.

The error recovery scheme supported by the drive provides a means to control the total error recovery time for the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent in error recovery for a command can be l im ite d via the Rec overy Tim e L im it bytes in the Error Recovery Mode Page. The total amount of time spent in error recovery for a single LBA can be limited via the Read Retry Count or Write Retry Count bytes in the Error Recovery Mode Page.

The drive firmware error recovery algorithms consist of 12 levels for read recoveries and 16 levels for writes. Table 4 equates th e R ead and Wr ite Re tr y Count with the maxi mum poss ible recovery tim e for read and wr ite

recovery of individual LBAs. The times given do not include time taken to perform reallocations, if reallocations are performed. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the Recovery Time Limit for the command has not yet been met. Time nee ded to perform reallocation is not counted against the Recovery Time Limit.

The Read Continuous (RC) bit, wh en set to one, re quests t he disc drive to transfer the requ ested data length without adding del ays (for retries or E CC correction) that may be required to insure data integrit y. The disc drive may send erroneous data in order to maintain th e continuous flow of data. The RC bit should only be used when data integrity is not a concern and speed is of utmost impor tance. If the Recovery Time Limit or retry count is rea ched dur ing err or recovery, the state of the RC bit is examined. If th e RC bit is set, the dr ive will transfer the unrecovered data with no error indication and cont inue to execute the remaining command. If the RC bit is not set, the dr ive will stop data transfer with the last good LBA, and repor t a “CHECK CONDITION, UNRECOVERED READ ERROR.”

38 Barracuda 18XL Product Manual, Rev. B

Table 4: Read and write retry count maximum recovery times [1]

Read retry count

0 108.73 0 92.0 1 125.46 1 117.1 2 426.56 2 125.46 3 460.02 3 150.55 4 526.93 4 301.10 5 593.84 5 359.65 6 677.48 6 593.84 7 802.94 7 618.94 8 836.4 8 660.76 9 911.68 9 685.85 10 2,371.24 10 1,735.68 11 (default) 3,422.04 11 1,760.76

Maximum reco very time per LBA (cumulative, msec)

Write retry count

12 1,769.12 13 1,794.2 14 1,944.68 15 2,003.2

Maximum reco very time per LBA (cumul ativ e, msec)

[1] These values are subject to change (for general information only). Setting these retr y counts to a value below the default setting could result in an incre ased unrecovered error

rate which may exceed the value given in this product manual. A setting of zero results in the drive not performing error recovery.

For example, suppose the read/write recovery page has the RC bit = 0, the read retry count set to four, and the recovery time limit (Mode Sense Page 01, bytes 10, 11) is set to FF FF hex (maximum). A four LBA read command is allowed to take up to 526.68 msec recovery time for each of the four LBAs in the comm and. If the recovery time limit (M ode Sense Page 01, bytes 10, 11) is set to 00 C8 hex (200 milliseco nds deci mal) a four LBA read command is al lowed to take up to 200 millisec onds for all error recover y within that co mmand. The use of the recovery time limit field (Mode Sense Page 01, bytes 10,11) allows finer granularity on control of the time spent in error recovery. The Recovery Time Limit only starts counting when the drive is executing error recovery and it resta rts on each c ommand. Therefore, each command’s total recovery tim e is subject to the Recovery Time Limit. Note: A RTL of zero (0) will use the drive default value of FF FF. Minimum RTL is achieved by specifying the RTL set to 00 01.

7.3 SCSI systems errors

Information on the repor ting of ope rational errors or faults across t he interface is given in the SCSI Interface Product Manual, part number 75789509. Message Protocol System is described in the SCSI Interface Product Manual. Several of the messages are used in the SCSI systems error management system. The Request

Sense command re turns i nformation t o the host abou t numerous kin ds of errors or faults. The Receive Diagnostic Results reports the results of diagnostic operations performed by the drive.

Status returned by the drive to the Initiator is described in the SCSI Interface Product Manual. Status reporting plays a role in the SCSI sys tems e rror m anagem ent and its use i n that r espe ct is desc rib ed in s ections wher e the various commands are discussed.

Barracuda 18XL Product Manual, Rev. B 39

8.0 Installation

The first thing to do when installi ng a drive is to set the drive ID (select) on the SCSI bus and set up ce rtain operating options. This is usually done by installing small shorting jumpers on the pins of connectors J2 and J6 on the Printed Circuit Boa rd Assembly (P CBA) (or J5 on the “LW” models) , or via the dri ve to host I/O signals on “LC” models. Some users connect cables to J6 or J5 and perform the set-up using remote switches.

Configure drive options

For option jumper locations an d d efi niti on s refer to Fig ur es 7a , 7b , and 7d. Drive default mode parameters are not normally needed for installation. Refer to Section 9.3.2 for default mode parameters if they are needed.

• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7. ID 7 is the highest priority on both 8 and 16 bit data buses.

• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on the bus.

• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. On “LC” and “LW” models, external terminators must be provided by the user, systems integrator or host equipment manufacturer.

• If the drive is attached to a bus that contains other devices, and if the new drive is not attached to the end of the bus, no terminators are needed.

Note.

• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after

• Installation instr uc ti ons ar e pr ovided by host syste m doc um enta tio n or with any additi ona ll y purc has ed drive

• Do not remove the manufacturer’s installed labels from the drive and do not cover with additio nal label s, as

Formatting

• It is not necessar y to low level format this dri ve. The drive is shipped fro m the factory l ow level formatted in

• Reformat the drive if a different spare sector allocation scheme is selected.

• High level format the drive involves assigning on e or more par titions or logical drives to the drive volume.

• Systems that have Windows 95 Operating Sys tem version 950B (this has FAT 32) or later do n ot need to

8.1 Drive ID/option select header

Figures 7a and 7b show views of the drive ID select jumper connectors. Figure 7 d shows the option select jumper connector for all mode ls. Figur e 7 b sh ows a rea r view of mode l drives for the purpose of showin g J5 of the drive. Both J5 and J6 have pins for selecting drive ID and for connecting the remote LED cable. Only one or the other should be used, although using both at the same time would not damage the drive. The notes following the figures describe the functions of the various jumper positions on the connectors J2, J5 and J6. See your local sales representative for suggested part number. A bag with the two jumper plug types is shipped with the standard OEM drives.

For additional information about terminator requirements, refer to Sections 9.8 and 9.9.

power has been applied, recycle the drive power to make the new settings effective.

installation software. If necessary see Section 10 for Seagate support services telephone numbers.

the manufacturer labels contain information required when servicing the product.

512 byte sectors.

Follow the instructions in the system manuals for the system into which the drive is to be installed.

partition the drive in order to access the total capacity of the drive.

40 Barracuda 18XL Product Manual, Rev. B

Drive Front

Jumper Plug

(enlarged to show detail)

Pin 1

Reserved

A2A1A

SCSI ID = 0 (default) SCSI ID = 1 SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6 SCSI ID = 7 SCSI ID = 8 SCSI ID = 9 SCSI ID = 10 SCSI ID = 11 SCSI ID = 12 SCSI ID = 13 SCSI ID = 14 SCSI ID = 15

Shipped with cover installed.

Host Alternate Usage Plug:

+5V

[1]

Drive Activity LED

Reserved

Pins

11 9 7 5 3 1

6842

Ground

Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage plug.

Do not connect anything to pins 13-20.

Do not install jumpers; retain cover.

[1] Voltage supplied by drive.

Figure 7a. Barracuda 18XL family drive ID select (W/LW/LC/LWV/LCV models)

Barracuda 18XL Product Manual, Rev. B 41

Drive Front

Jumper Plug

(enlarged to show detail)

Pin 1

Reserved

SCSI ID = 0 (default) SCSI ID = 1

A2A1A

SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6 SCSI ID = 7

[3]

Host

[4]

Alternate Usage Plug:

+5V

[6]

Drive Activity LED

Dashed area is optional host circuitry (external to the drive)

[4]

Reserved

Pins

1197531

642

Ground

Shipped with cover installed.

Do not install jumpers; retain cover.

connected to host supplied optional usage plug.

Do not connect anything to pins 13-20.

Figure 7b. Barracuda 18XL family drive ID select header J6 for N model (J6 Pins 1–12)

42 Barracuda 18XL Product Manual, Rev. B

Drive HDA (rear view, PCBA facing downward)

68 Pin

SCSI I/O Connector

[1] Voltage supplied by drive.

Pin 1

+5V Ground

Pin 1

Pin 12 SCSI ID = 0 (default) SCSI ID = 1

SCSI ID = 2 SCSI ID = 3 SCSI ID = 4 SCSI ID = 5 SCSI ID = 6 SCSI ID = 7

SCSI ID = 8 SCSI ID = 9

SCSI ID = 10 SCSI ID = 11 SCSI ID = 12 SCSI ID = 13 SCSI ID = 14 SCSI ID = 15

A3A2A

Host Alternate Usage Plug

[1] +5V

+5V

Ground

Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage plug.

1197531

12 10 8 6 4 2

N.C.

Drive Activity LED

A0A1A2A

1P2P3P4P

J1-DC Power

PCBA

For ID selection use jumpers as shown or connect a cable for remote switching as shown below.

Pins 1, 3, 5, and 7 are optional connections to switching circuits in host equipment to establish drive ID.

Remote Switches

Pins 2, 4, 6, and 8 are normally not grounded. They are driven low (ground) for 250 ms after a Reset or PWR ON to allow drive to read SCSI ID selected.

Figure 7c. Barracuda 18XL family drive ID select header J5 for W/LW/LWV models (J5 Pins 1–12)

Barracuda 18XL Product Manual, Rev. B 43

Jumper

[1]

Positions

Force Single-Ended I/O

Single-Ended or

Low-Voltage Differential

Delay Motor Start

Enable Motor Start

Write Protect

Parity Disable

SEDSMEWPP

Pin 1

EST

Jumper Plug

(enlarged to show detail)

Drive Front

[1] Jumper position names shown here are not marked on the PCBA. They are shown here for reference only.

Additional information on these functions is in Section 8.1.1.

Figure 7d. Barracuda 18XL family drive option select header (for LW/LC/LWV/LCV models)

*Additional notes on these

functions in section 8.1.2.

Jumper

Positions

Terminator Enable

Delay Motor Start

Enable Motor Start

Write Protect

Parity Disable

Term. Power from Drive

Term. Power to SCSI Bus

Term. Power from SCSI Bus

TEDSMEWPP

Pin 1

Jumper Plug

(enlarged to show detail)

Drive Front

Figure 7e. Barracuda 18XL family drive option select header (for N and W models)

44 Barracuda 18XL Product Manual, Rev. B

8.1.1 Function description

J2 jumper installation Jumper function description

(Applies only to “N” and “W” models)

With the jumper installed, the onboard (non-removable) terminator circuits are enabled (connected to the I/O lines).

Default

is jumper installed.

Off Terminator circuits not enabled (not connected to I/O lines).

On Forces drive to use single-ended I/O drivers/receivers only. Off Drive can operate on the interface in low voltage differential mode or single-ended,

depending on the voltage state of the I/O “DIFFSNS” line.

Default

is no jumper on.

DS ME

Off

Off Spindle starts immediately after power up—

Default

setting. Off On Drive spindle does not start until Start Unit command received from host. On Off Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0

spindle starts immediately when DC power connected, drive 1 starts after 12 second delay, drive 2 starts after 24 second delay, etc.

On On Drive spindle starts when Start Unit command received from host. Delayed start feature is

overridden and does not apply when ME jumper is installed.

On Entire drive is write protected. Off

Drive is not write protected.

Default

is no WP jumper installed.

On Parity checking and parity error reporting by the drive is disabled. Off

Drive checks for parity and reports result of parity checking to host.

Default

is PD jumper not installed.

RES (2)

Off

(Not for “LC” model)

Off No terminator power is connected to drive terminators or SCSI bus I/O cable.

On Drive supplies power to SCSI bus I/O cable.

Reserved jumper position. Default is no jumper installed.

on is factory

default.

A jumper on the TP position may be needed to

No jumpers

power external terminators (see Section 9.8 and Figure 10a).

TP1 and TP2

On This horizontally-positioned jumper across the two TP positions furthest from the PCB edge,

(Applies only to “N” and “W” models)

connects terminator power from SCSI bus I/O Termpower cable

to the drive’s internal te rmi-

nators (for single-ended I/O only).

Off See above explanations for TP jumpers.

1. See Figure 7d and 7e for pins used for Termpower.

2. See Figure 7d for pins used for T ermpower.

Barracuda 18XL Product Manual, Rev. B 45

8.2 Drive orientation

The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive performance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, and these are the two preferred mounting orientations.

8.3 Cooling

Cabinet cooling must be des igned by th e custo mer so that the ambien t temperatu re immedi ately s urroundin g the drive will not exceed temperature c onditions specified in Section 6.4.1, “Temperature.” Specific consideration should be given to make sure adequate air circulation is pr esent a ro und the printed circuit boar d (PCB A) to meet the requirements of Section 6.4.1, “Temperature.”

8.3.1 Air flow

The rack, cabinet, or drawer environment for the Barracud a 18XL drive must provide heat removal from th e electronics and head and disc assembly (HDA). You should confir m that adequate heat removal is provided using the temperature measurement guidelines described in Section 6.4.1.

Forced air flow may be required to keep temp eratures at or be low the s pecified case te mpe ratures of Table 3, Column 2, in which case th e drive should be or ient ed, or air flow direc ted, so that th e least amo unt of air flow resistance is created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air inlet a nd exit should be chosen to m inimize the travel length of air heated by the dr ive and other heat sources within the rack, cabinet, or drawer environment.

If forced air is determi ned to be necessa ry, possible air-flow patterns are shown in F igure 8. The a ir-flow patterns are created by one or more fans, either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced air-flow patter ns are acceptable a s long as the temperatu re measurement guidelines of Section 6.4.1 are met.

Above unit

Under unit

Note. Air flows in the direction shown (front to back) or in reverse direction (back to front)

Note. Air flows in the direction shown or in reverse direction (side to side)

Figure 8. Air flow (suggested)

Above unit

Under unit

46 Barracuda 18XL Product Manual, Rev. B

8.4 Drive mounting

When mounting the drive usin g the bottom holes (x-y plane in Figu re 5) car e must be taken to ens ure that the drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface stiffness:

--- 80lb/in (14.0 N/mm)== x

where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane mounting surface distor tion (units of inches or millimeter s). The out-of-plane distor tion (‘x’) is determined by defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflec tion of the fourth mounting point when a known force is applied to the fourth point.

Note.

8.5 Grounding

Signal ground (PCBA) and HDA ground are connecte d together in the drive and cannot be separate d by the user. The equipment in which the drive is moun ted i s co nnec te d dire ct ly to th e HDA and PCBA wi th n o el ectrically isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCBA ground, the systems integrator or user must provide a nonconductive (electr ically isol ating) method of mou nting the drive in the host equipment.

Increased radiated emissions may result if you do not provide the maximum surface area ground connection between system ground and drive ground. This is the system designer’s and integrator’s responsibility.

Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate Technology that the drive can meet the shock and vibration s pecifications given herein while mounted i n such an adapter frame. Adap ter frames that are available may not have a mechanical structure capable of mounting the drive so that it can meet the shock and vibration specifications listed in this manual.

Barracuda 18XL Product Manual, Rev. B 47

9.0 Interface requirements

9.1 General description

This section describes in essentially general terms th e interface requirements supported by the Barracud a 18XL. No attempt is made to des cri be all of the minute detail s of cond itions a nd con straints th at must be considered by designers wh en designing a system i n which this family of drives can pr operly operate. Seagate declares that the drives operate in accordance w ith the appropriate ANSI Standards referenced in various places herein, wi th exceptions as n oted h erein or in the S eagate SCSI Interface Product Manual , part num- ber 75789509.

9.2 SCSI interface messages supported

Table 5 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Barracuda 18XL family drives.

Table 5: SCSI messages supported by Barracuda 18XL family drives

Supported by

Message nam e Message co de

Abort 06h Y Abort-tag 0Dh Y Bus device reset 0Ch Y Clear queue 0Eh Y Command complete 00h Y Continue I/O process 12h Y Disconnect 04h Y Extended messages 01h [1] Y Identify 80h-FFh Y Ignore wide residue (two bytes) 23h Y Initiate recovery 0Fh N Initiator detected error 05h Y Linked command complete 0Ah Y Linked command complete with flag 0Bh Y Message parity error 09h Y Message reject 07h Y Modify data pointer [1] N No operation 08h Y Parallel protocol request [1] Y Queue tag messages (two bytes)

Head of queue tag 21h Y Ordered queue tag 22h Y

Simple queue tag 20h Y Release recovery 10h N Restore pointers 03 h Y Save data pointer 02h Y Synchronous data transfer req. [1] Y Target transfer disable 13h Y Terminate I/O process 11h N Wide data transfer request [1] Y

Notes.

[1] Extended messages (see the SCSI Interface Product Manual, part number 75789509).

Barracuda 18XL

48 Barracuda 18XL Product Manual, Rev. B

9.3 SCSI interface commands suppor ted

Table 6 following lists the SCSI interface commands that are supported in the Barracuda 18XL Family drives.

Table 6: Commands supported by Barracuda 18XL family drive

Command name

Command code

Supported by Barracuda 18XL

Change definition 40h N Compare 39h N Copy 18h N Copy and verify 3Ah N Format unit [1] 04h Y Block Format N Bytes from index Y Physical sector format Y DPRY bit supported N DCRT bit supported Y STPF bit supported Y IP bit supported Y DSP bit supported Y IMMED bit supported Y VS (vendor specific) N Inquiry (see Table 7 for Inquiry data) 12h Y

Date code page (C1h) Y Device Behavior page (C3h) Y Firmware numbers page (C0h) Y Implemented operating def page (81h) Y Jumper settings page (C2h) Y Supported Vital product data page (00h) Y

Unit serial number page (80h) Y Lock-unlock cache 36h N Log select 4Ch Y

DU bit N

DS bit Y

TSD bit Y

ETC bit N

TMC bit N

LP bit N Log sense 4Dh Y

Cache statistics page (37h) Y

Non-medium error page (06h) Y

Pages supported list (00h) Y

Power-on time page (3Eh) Y

Read error counter page (03h) Y

Drive self-test page (10h) Y

S.M.A.R.T. attribute log page (30h) Y

Verify error counter page (05h) Y

Write error counter page (02h) Y Mode select (same pages as Mode Sense command) 15h Y [2] Mode select (10) 55h Y

Capacity Programming Y Mode sense 1Ah Y [2]

Barracuda 18XL Product Manual, Rev. B 49

Table 6: Commands supported by Barracuda 18XL family drive (Continued)

Command

Command name

code

Caching parameters page (08h) Y Control mode page (0Ah) Y Disconnect/reconnect (02h) (DTDC, DIMM not used) Y Error recovery page (01h) Y Format page (03h) Y

Information exceptions control page (1Ch) Y

Notch and Partition Page (0Ch) N Power condition page (1Ah) Y Rigid disc drive geometry page (04h) Y Unit attention page (00h) Y

Verify error recovery page (07h) Y Xor Control page (10h) N Mode sense (10) 5Ah Y Prefetch 34h N Read 08h Y Read defect data (12) B7h Y Read buffer (modes 0, 2, 3 supported) 3Ch Y Read capac ity 25h Y Read defect data (10) 37h Y Read extended 28h Y DPO bit supported Y FUA bit supported Y Read long 3Eh Y Reassign blocks 07h Y Rebuild 81h N Receive diagnostic results 1Ch Y

Supported diagnostics pages (00h) Y

Translate page (40h) Y Regenerate 82h N Release 17h Y Release (10) 57h Y Request sense 03h Y

Actual retry count bytes Y

Deferred error supported Y

Extended sense Y

Field pointer bytes Y Reserve 16h Y

3rd party reserve Y

Extent reservation N Reserve (10) 56h Y 3rd part reserve Y Extent reservation N Rezero unit 01h Y Search data equal 31h N Search data high 30h N Search data low 32h N Seek 0Bh Y

Supported by Barracuda 18XL

50 Barracuda 18XL Product Manual, Rev. B

Table 6: Commands supported by Barracuda 18XL family drive (Continued)

Command

Command name

code

Seek extended 2Bh Y Send diagnostics 1Dh Y

Supported diagnostics pages (00h) Y Translate page (40h) Y

DST (logical unit self-test diagnostics) Y Set limits 33h N Start unit/stop unit (spindle ceases rotating) (1Bh) 1Bh Y Synchronize cache 35h Y Test unit ready 00h Y Verify 2Fh Y DPO bit supported Y BYTCHK bit supported Y Write 0Ah Y Write and verify 2Eh Y DPO bit supported Y BYTCHK bit supported Y Write buffer (modes 0, 2, supported) 3Bh Y Firmware download option (modes 5, 7 supported) [3] Y Write extended 2Ah Y DPO bit supported Y FUA bit support Y Write long 3Fh Y Write same 41h Y PB data N LB data N XDRead 52h N XDWrite 50h N XDWrite extended 80h N XPWrite 51h N

Supported by Barracuda 18XL

[1] The drive can format to sector sizes from 512 to 2,048 bytes/sector in multiples of 2 bytes/sector. [2] Table 9a shows how individual bits are set and which are changeable by the host.

WARNING:

[3]

A power loss during fl as h programm in g c an re sul t in firmware corruption. This usua lly makes

the drive inoperable.

Barracuda 18XL Product Manual, Rev. B 51

Table 7 lists the Standard Inquiry command data that the drive should return to the initiator per the format given in the SCSI Interface Product Manual, part number 75789509, Inquiry command section.

Table 7: Barracuda 18XL family drive Standard Inquiry data

Bytes Data (HEX)

0-15 00 00 [03]1[12]28B 00 01 3E 53 45 41 47 41 54 45 20 VENDOR ID 16-31 53 54 [33]3[31]3[38]3[34]3[33]3[36]3[4C]3[57]3[20]320 20 20 20 20 PRODUCT ID 32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00 48-63 000000 00000000000000000000000000 64-79 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80-95 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 96-111 00 43 6F 70 79 72 69 67 68 74 20 28 63 29 20 [31] COPYRIGHT

112-127 [39] [39] [39] 128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20

[]

03 means SCSI-3 implemented. Change Definition command not supported.

01 means response data in SCSI-1 format and has compatibility with Common Command Set data.

[]

20 53 65 61 67 61 74 65 20 41 6C 6C 20 NOTICE

02 means response data in SCSI-2/SCSI-3 format. In addition, 12 indicates that the drive uses the hierarchial addressing mode to assign LUNs to logical units. Default is 12.

R# Four ASCII digit s representing the product F irmware Version number. The Firmware Releas e Number is

also given in the Vital Product Data page C0h, together with servo firmware release numbers.

S# Eight ASCII digits representing the eight digits of the product serial number.

[]

Bytes 18 through 26 reflect mod el of dri ve. Shown here are hex values for Model ST318436LW. The hex values for bytes 18 through 26 for the various models are listed below.

Model number Bytes 18-26 hex values

ST318436LW 33 31 38 34 33 36 4C 57 20 ST318436LC 33 31 38 34 33 36 4C 43 20 ST318436LWV 33 31 38 34 33 36 4C 57 56 ST318436LCV 33 31 38 34 33 36 4C 43 56 ST318426LW 33 31 38 34 32 36 4C 57 20 ST318426LC 33 31 38 34 32 36 4C 43 20 ST318416N 33 31 38 34 31 36 4E 20 20 ST318416W 33 31 38 34 31 36 57 20 20 ST39236LW 33 39 32 33 36 4C 57 20 20 ST39236LC 33 39 32 33 36 4C 43 20 20 ST39236LWV 33 39 32 33 36 4C 57 56 20 ST39236LCV 33 39 32 33 36 4C 43 56 20 ST39226LW 33 39 32 32 36 4C 57 20 20 ST39226LC 33 39 32 32 36 4C 43 20 20 ST39216N 33 39 32 31 36 4E 20 20 20 ST39216W 33 39 32 31 36 57 20 20 20

[]

52 Barracuda 18XL Product Manual, Rev. B

9.3.1 Inquiry Vital Product data

Instead of the standard Inquiry data shown in Table 7, the initiator can request several Vital Product Data pages by setting the Inquir y command EVPD bit to one. The SCSI Inter fa ce Product Manual, part number 75789509, list s the Vital Product Data pages and describe s their forma ts. A separate Inqui ry c ommand must be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.

Table 8 shows the Vital Product Data pages for the drives of this product manual. “Y” means reporting that particular parameter is supported, but it may be different for each drive.

Table 8: Vital product data pages

Byte Page Supported

Unit serial number page 80h

0 Peripheral qualifier/peripheral device type — 1 Page code number 80 2 Reserved 00 3 Page length 14 4-23 Product serial number Y

Implemented operating definition page 81h

0 Peripheral qualifier/peripheral device type — 1 Page code number 81 2 Reserved 00 3 Page length 03 4 SAVIMP=0, current operating definition Y 5 SAVIMP=0, default operating definition Y 6 SAVIMP=0, supported operating definition Y

Firmware numbers page C0h

0 Peripheral qualifier/peripheral device type — 1 Page code number C0 2 Reserved 00 3 Page length 38 4-11 SCSI firmware release number Y 12-19 Servo firmware release number Y 20-27 SAP block point numbers (major/minor) Y 28-31 Servo firmware release date Y 32-35 Servo firmware release year Y 36-43 SAP firmware release number Y 44-47 SAP firmware release date Y 48-51 SAP firmware release year Y 52-55 SAP manufacturing key Y 56-59 Servo firmware product families and product family member IDs Y

Data code page C1h

0 Peripheral qualifier/peripheral device type Y 1 Page code number C1 2 Reserved 00 3 Page length 10 4-11 Manufacture (ETF) date—MMDDYYYY Y 12-19 SCSI firmware release date—MMDD YYYY Y

Barracuda 18XL Product Manual, Rev. B 53

Table 8: Vital product data pages (Continued)

Byte Page Supported

Jumper settings page C2h

0 Peripheral qualifier/peripheral device type Y 1 Page code number C2 2 Reserved 00 3 Page length 02 4 SCSI ID, delayed motor start, motor start, write protect, parity

enable

5 Terminator enable [1]

[1] “N” and “W” models support Terminator Enable. Vital Product data pages C3h, D1h, and D2h are supported vendor-specific pages. Descriptions of their usage

are not available at this time.

9.3.2 Mode Sense data

The Mode Sense command provides a means for the drive to report its operatin g parameters to the initiator. The drive maintains four sets of Mode parameters: Default values, Saved values, Current values and Chan geable values.

Default values are hard coded in the dri ve firmware t hat is stor ed in fl ash EPROM nonvolatile mem or y on th e drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash EPROM. An initiator can r equest and receive from the drive a list of Default values and use tho se in a Mode Select command to set up new Current and Saved values, where the values are changeable.

Saved values are stored on the disk media using a Mode Select command. Only parameter values that ar e allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in the Saved values list that are not changeable by the Mode Select command get their values from the Default values storage.

Current values are volatile values currently being used by the drive to control its operation. A Mode Select command can be used to change these values (only those that are changeable). Originally, they are installed from Saved or Default values after a power on reset, hard reset, or Bus Device Reset message.

Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the Cur rent values and Saved values can be changed by a Mode Select com mand. A “one” al lows a change to a correspon ding bit; a “zero” allows no change. For example, in Table 9a refer to Mode page 01, in the row entitled “CHG”. These are hex numbers representing the changeable values for Mode page 01. Note that bytes 04, 05, 06, and 07 are not changeable, becau se those fields ar e all zeros. If some changea ble code had a hex value EF, that equates to the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable. Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.

Though the drive always reports non-zero values in bytes 00 and 01 , tho se pa rticular bytes are never changeable.

The Changeable values list can only be changed by downloading new firmware into the flash EPROM. On standard OEM drives the Saved values are taken from the Default values list and stored into the Saved val-

ues storage location on the media prior to shipping. When a drive is powered up, it takes Saved values from the media and stores them to the Cu rren t values stor -

age in volatile memory . It is not possible to change the Current values (or the saved values) with a Mode Select command before the drive is up to speed and is “ready.” An attempt to do so results in a “Check Condition” sta- tus being returned.

Note.

Because there may be several different versions of drive contr ol firmware in the total population of drives in the field, the Mode Sens e values given in the following tables may not exactly match those of some drives.

54 Barracuda 18XL Product Manual, Rev. B

The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages (see the SCSI Interface Product Manual, P/N 75789509).

Definitions:

SAV = Saved value DEF = Default value. Standard drives are shipped configured this way. CHG = Changeable bits; indicates if current and saved values are changeable.

T a b l e 9a: Mode sense data, ST318436 va lue s

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 01 68 00 00 00 02 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 02 23 90 70 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 01 68 00 00 00 02 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

08 SAV 88 12 14 00 FF FF 00 00 FF FF FF FF 80 [3] 00 00 00 00 00 00 08 DEF 88 12 14 00 FF FF 00 00 FF FF FF FF 80 10 00 00 00 00 00 00 08 CHG 88 12 B5 00 00 00 FF FF FF FF 00 00 A0[1] FF 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A DEF 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

Barracuda 18XL Product Manual, Rev. B 55

T a b le 9b: Mode sense data, ST318426 values

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 01 68 00 00 00 02 00 00 01 A0 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 02 23 90 70 00 00 20 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 01 68 00 00 00 02 00 00 01 A0 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A DEF 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

56 Barracuda 18XL Product Manual, Rev. B

T a b l e 9c: Mode sense data, ST318416 va lue s

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 02 23 90 70 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A DEF 8A 0A 02 00 00 00 00 00 00 00 04 E7 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

Barracuda 18XL Product Manual, Rev. B 57

Table 9d: Mode sense data, ST39236 values

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 01 11 C8 38 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 02 52 0A DEF 8A 0A 02 00 00 00 00 00 00 00 02 52 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

58 Barracuda 18XL Product Manual, Rev. B

Table 9e: Mode sense data, ST39226 values

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 01 11 C8 38 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 02 52 0A DEF 8A 0A 02 00 00 00 00 00 00 00 02 52 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

Barracuda 18XL Product Manual, Rev. B 59

Table 9f: Mode sense data, ST39216 values

Bytes 00010203040506070809101112 1314151617181920212223

Mode Sense Data

Mode Page

01 SAV 01 DEF 81 0A C0 0B F0 00 00 00 0F 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

02 SAV 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 DEF 82 0E 80 80 00 0A 00 00 00 00 00 00 00 00 00 00 02 CHG 82 0E FF FF 00 00 00 00 00 00 00 00 87 00 00 00

03 SAV 83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 03 DEF 03 CHG

04 SAV 84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 04 DEF 04 CHG

07 SAV 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 DEF 87 0A 00 0B F0 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

9F 00 10 08 01 11 C8 38 00 00 02 00

<------------------------------Mode Page Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B F0 00 00 00 0F 00 FF FF

83 16 0A 7D 00 00 00 07 00 00 01 A1 02 00 00 01 00 36 00 36 40 00 00 00 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

84 16 00 38 30 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 05 00 00 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 00 00 00 00 02 52 0A DEF 8A 0A 02 00 00 00 00 00 00 00 02 52 0A CHG 8A 0A 03 F1 00 00 00 00 00 00 00 00

1A SAV 9A 0A 00 03 00 00 00 01 00 00 00 04 1A DEF 9A 0A 00 03 00 00 00 01 00 00 00 04 1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

1C SAV 9C 0A 00 00 00 00 00 00 00 00 00 01 1C DEF 9C 0A 00 00 00 00 00 00 00 00 00 01 1C CHG 9C 0A 8D 0F FF FF FF FF FF FF FF FF

00 SAV 80 02 [2] 00 00 DEF 80 02 80 00 00 CHG 80 02 F7 40

Notes [ ].

See Section 9.3.2.1.

60 Barracuda 18XL Product Manual, Rev. B

9.3.2.1 Notes for tables 9a through 9f

[1] Though byte 12, bit 7 ( A0) is shown as changeable, the FSW function governed by that bit is n ot imple-

mented by this drive.

[2] Page 0, Byte 2, Bit 7 is defined as the Performance Mode (PM) bi t. When set to zero (Ser ver mode), th e

SCSI firmware is performance optimized for server applications. When the bit is set to one (Desktop mode), the SCSI firmware is performance optim ized for desktop applications. The fir mware default cond ition for the PM bit is set to one for Desktop mode. During the manufacturin g process, the Saved value of the PM bit remains set to the fi rmware default condition ( one) for drives with the LW and LWV i nterface. Drives manufactured with all other int erfaces (N, W, LC, LCV) save the Saved value of the PM bit set to the Server mode (zero).

[3] When the Performance Mo de bit (Page 0, Byte 2, B it 7) is set to Server mode (zero) , the Number of

Cache Segments shoul d be set to three. When the Performance Mode bi t is set to Desktop mode (on e), the Number of Cache Segments should be set to sixteen (10h).

Barracuda 18XL Product Manual, Rev. B 61

9.4 SCSI bus conditions and miscellaneous features supported

Asynchronous SCSI bus condi tions supported by the drive are lis ted be low. These conditions cause the SCS I device to perform certai n action s and can alter the SCSI bus phase se quenc e. Other misce llaneous operatin g features supported are also listed here. Refer to the SCSI Inter face Product Manual, part numb er 75789509, for details.

T a b le 10: SCSI bus conditions and other miscellaneous features

Supported Conditions or feature

Y 50, 68, and 80 pin interface connectors Y 1 Mbyte data buffer N Active termination disabled via jumper Y Terminator power from drive power connector and to SCSI bus option Y Terminator power from drive power connector option Y Terminator power from SCSI bus pin 26 option Y Terminator power from SCSI I/O cabl e pin 26 Y Active termination enabled (N and W models only) N Adaptive caching Y Adaptive read look-ahead Y Arbitrating system Y ASYNC burst rate of 5 Mbytes/sec.—single-ended Y Asynchronous data transfer N Asynchronous event notification Y Attention condition Y Audio video recovery scheme N Automatic adaptive cache (customer unique option) Y Capacity programming Y Command overhead less than 500 USEC, typ. Y Contingent allegiance condition Y Deferred error handling Y Delayed motor start Y Disconnect/reconnect Y Embedded servo Y Firmware downloadable via SCSI interface Y Flag and link bits in control byte supported Y Format progress indi cat ion Y Full automatic read and write reallocation Y Hot plugging, with bus active Y Immediate status on Format Unit command Y Immediate status on Start/Stop command Y Immediate status on Synchronize cache Y Linked commands—customer unique options Y Low voltage differential SCSI (LVD) Y Motor start enable Y Multi-initiator Y Multi-mode drivers/receivers (single-ended/differential) Y Parameter rounding Y Power management, SCSI-3 Y Queue tagging (up to 64 Que tags supported)

62 Barracuda 18XL Product Manual, Rev. B

Supported Conditions or feature

Y Read look ahead crossing cylinder boundaries N Relative addressing—customer unique options Y Reporting actual retry count in Extended Sense bytes 15, 16 and 17. Y Reset condition Y RPS (rotational position seek/ so rt) YS2 bit SCA-2 SCA connector (optional) Y SCSI ID accessibility to front end (J6) Y SCSI-3 SPI compliant Y Variable Sector size, 512 to 4,096 in 2 byte multiples Y Segmented caching Y S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology) N Sparing scheme per cylinder N Sparing scheme p er track N Sparing scheme p er volume Y Sparing scheme per zone Y Strict bit support Y Sustained transfer rate of 3 Mbytes/sec.—single-ended N Sync spindles—rotational position offset N Synchronized (locked) spindle operation Y Synchronous data transfer Y Tagged command queuing 64 deep Y Target initiated SDTR N TTD/CIOP Y Ultra SCSI, 20 Mbytes/sec. Y Ultra-2 SCSI, 40 Mbytes/sec. Y Ultra160 SCSI, 80 Mbytes/sec. (LVD, single transition only) [1] Y Ultra160 SCSI, 160 Mbytes/sec. (LVD, double transition only) [1] Y Write protected N Zero latency read

Supported Status supported

YGood Y Check conditio n Y Condition met/good YBusy Y Intermediate/good Y Intermediate/condition me t/go od Y Reservation conflict Y Queue full N Auto contingent allegiance active

[1] ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

Barracuda 18XL Product Manual, Rev. B 63

9.5 Synchronous data transfer

9.5.1 Synchronous data transfer periods supported

Table 11 and Sect ion 9.5.2 list Synchron ous Data transfer periods suppor ted by the drive. The data transfer period to be used by the drive and the initiator is established by an exchange of messages during the Message Phase of operation. See the section “Extended Message” on message protocol in the SCSI In terface Product Manual, part number 75789509. By te 3 of the me ssage format lis ts a transfer per iod factor. The factors possible and equivalent transfer periods are listed in Table 11.

Table 11: Synchronous data transfer periods for drive Transfer period

factor

Transfer period (nanoseconds)

00h-09h Reserved [1] 0Ah Transfer period equals 25 ns [2] 0Bh Transfer period equals 30.3 ns [2] 0Ch Transfer period equals 50 ns [3] 0Dh-18h Transfer period equals the transfer period factor * 4 [3] 19h-31h Transfer period equals the transfer period factor * 4 [4] 32h-FFh Transfer period equals the transfer period factor * 4 [5] 05h Transfer period equals 12.5 ns [6]

Notes.

[1] Faster timings may be allowed by future SCSI parallel interface standards. [2] Fast-40 data transfer rates that have a period equal to 25 ns or 30.3 ns. [3] Fast-20 data transfer rates that have a period of ≤ 96 ns and ≥ 50 ns. [4] Fast-10 data transfer rates that have a period of ≤ 196 ns and ≥ 100 ns. [5] Fast-5 data transfer rates that have a period of ≤ 1020 ns and ≥ 200 ns. [6] Fast-80 data transfer rates that have a period equal to 12.5 ns.

9.5.2 REQ/ACK offset

The maximum value supported by the Barracuda 18XL family drives for REQ/ACK offset is 15 (0Fh).

9.6 Physical interface

Figures 9a and 9b show the loca tions of the dr ive physical interface compone nts for the various model s of the drive. Shown are the locations of the DC power connector, the SCSI interface connector, and the drive select and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI operational aspects of Seagate dr ive interfaces are given in the SCSI Interface Produc t Manual, par t number

75789509. This section descr ibes the connectors, cables, signals, terminator s and bus timing of the DC and SCSI I/O

interface. See Section 9.8 and Section 9.9 for additional terminator information.

9.6.1 DC cable and connector

With the exception of the “LC” drives, the drive receives DC power through a 4 pin connector (see Figure 9a for pin assignment) mounted at the rear of the main PCBA. Recommended part numbers of the mating connector are listed below, but equivalent parts may be used.

Type of cable Connector Contacts (20-14 AWG)

14 AWG MP 1-480424-0 AMP 60619-4 (Loose Piece)

AMP 61117-4 (Strip)

Model “LC” receives power through the 80 pin I/O connector. See Table 13d.

64 Barracuda 18XL Product Manual, Rev. B

Pin 1

68 Pin

SCSI I/O

Connector

Pin 1

1P 2P 3P 4P

Pin 1

Pin 1P

Power

+12V +12V ret + 5V ret + 5V

J1-DC Power

1P2P3P4P

PCBA

J1-DC Power

Figure 9a. Model “LW” and “LWV” drive physical interface (68 pin J1 SCSI I/O connector)

80 Pin SCSI I/O

and Power

Connector

Pin 1

Note: See Table 13d for DC power pin assignments.

Figure 9b. Model “LC” and “LCV” drive physical interface (80 pin J1 SCSI I/O connector and DC power

connector)

Barracuda 18XL Product Manual, Rev. B 65

Pin 1

1P 2P 3P 4P

Power

+12V +12V ret + 5V ret + 5V

4P 3P 2P 1P

DC Power Connector

SCSI I/O Connector

Figure 9c. Models “N” and “W” drive physical interface

66 Barracuda 18XL Product Manual, Rev. B

9.6.2 SCSI interface physical description

The drive models desc ribed by this product manual support the physical interface requirements of the SCS I Parallel Interface-2 (SPI-3) and EPI standards as defined in American National Standard documents T10/ 1302D and X3T10/1143D , and operate compatibly at the interface with devices that only support earlier singleended SCSI-2 and SCS I-3 standards. It shoul d be noted that this i s only true if th e systems enginee ring has been correctly done, and if ear lier SCSI-2 a nd SCSI-3 devices respon d in an acceptable manner (p er applic able SCSI Standards) to r eject newer SCS I-3 protocol extensions that t hey don’t support. Low voltage differential (LVD) circuits are not compatible with high voltage differential (HVD).

The family of drives in this manual supports the single-ended and low voltage differential physical interconnects (hereafter referred to as SE and LVD, respectively) as described in the ANSI SPI-3 and EPI standards.

The drives typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices on the daisy chain must all op erate in the same mode, either SE or LVD, but not a mixture of these. On th e interface daisy chain, all signals are common between all devices on the chain, or bus, as it is also called. This daisy chain of SCSI devices must be ter minated at both ends with the proper im pedance in order to operate correctly. Intermedia te SCSI devices shall not be ter mi nat ed. Mo del s “LC” an d “LW” have no onboard ter mi nation circuits. Some type of exter nal termination circ uits must be provided for these drives by the end user or designers of the equipment into which the drives will be integrated. See SPI-3 and EPI standards for the maximum number of devices that can su ccess fully operate at various i nterface transfer rates on SE and LVD daisy chains.

“LC” model drives plug into PCBA or bulkhead connectors in the Host. They may be connected in a daisy-chain by the host backplane wiring or PCBA circuit r uns that have adequate DC current carrying capacity to suppo rt the number of drives plugged into the PCBA or bulkhead co nnectors. A single 80 pin I/O c on nec tor c able c annot support the DC current n eed s of s everal drives, so no da isy c hai n cables beyond the bulkhe ad co nnec to rs should be used. A single drive connected via a cable to a host 80 pin I/O connector is not recommended.

Table 12 shows the interface transfer rates supported by the various drive models defined in this manual.

Table 12: Interface transfer rates supported

Maximum transfer rate

Interface type/drive models

SE “LW,” “LC,”

Asynchronous Fast-5 Fast-10 Fast-20 Fast-40 Fast-80

yes yes yes yes no no

[3]

“LWV,” “LCV,” “N,” “W”

LVD (ST) [1] “LW,” “LC,”

yes yes yes yes yes no

“LWV,” “LCV”

LVD (DT) [2] “LW,” “LC,”

no yes yes yes yes yes

“LWV,” “LCV”

Notes.

[1] ST = Single Transition (latching data only on the assertion edge of the REQ/ACK signal) [2] DT = Double Transition (latching data on both th e asse rtion edge and the ne gated edg e of the REQ/ACK

signal)

[3] ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

Barracuda 18XL Product Manual, Rev. B 67

9.6.3 SCSI interface cable requirements

The characteristics of cables used to connect SCSI-3 parallel interface devices are discussed in detail in ANSI Standard T10/1302D (SPI-3) and X3T10/1143D. The cable characteristics that must be considered when interconnecting the drives described in this manual in a SCSI-3 parallel, daisy-chain interconnected system are:

• characteristic impedance (see section 6.1)

• propagation delay (see section 6.1)

• cumulative length (see sections 6.4 and 6.5)

• stub length (see sections 6.4 and 6.5)

• device spacing (see sections 6.4 and 6.5)

To minimi ze discontinuance s and sign al reflectio ns, cables of different imped ances should not be used in the same bus. Implementations may require trade-offs in shie lding effectiveness, cable length, number of loads and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedanc e mismatch must be ca refully consider ed. Proper impedance mat ching is esp ecially im por tant in order to main tain adequa te margin at Fast-20, Fast-40, and Fast-80 SCSI transfer rates.

Note.

Note. For “LC” models:

The 80 pin connector option is intended for use on drives that plug directly into a PCBA or wall/bracket mounted connector in the hos t equipment. In such ins tallations, all backplane wirin g segments are subjec t to the electromagnetic concepts presented i n Standard T10/1302 D (SPI-3). For “LC” model dr ives, installations with connectors on cables are not recommended.

9.6.4 Mating connectors

Part numbers for the different type connectors tha t mate with the various B arracuda 18XL I/O con nectors are given in the sections following.

9.6.4.1 Mating connectors for “W,” “LW,” and “LWV” models

The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 male contacts with adjacent contacts 0.050 inch (1.27 mm) apart.

Recommended mating flat cable connector part numbers are: Amp Model 786096-7 Female, 68-pin, panel mount Amp Model 786090-7 Female, 68-pin, cable mount Amp Model 749925-5 (50 mil conductor centers, 28 or 30 AWG wire)

For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair cables are strongly recommended. For Fast-80 operation, twisted pair cables are required.

ST318426LW/LC and ST39226LW/LC models do not support Fast-80/Ultra160.

Use two, 34 conductor, 50 mil center flat cable with this connector. This type connector can only be used on cable ends. [1]

Amp Model 88-5870-294-5 W/O Strain Relief (25 mil conductor centers, 30 AWG wire).

Use either on cable ends or in cable middle section for daisy-chain

installations [1]. Amp Model 1-480420-0 Power connector 4 circuit housing Berg 69307-012 12-position, 2 x 6, 2 mm receptacle housing

[1] See Figure 10a. The drive device connector is a nonsh ielded 68 c onductor co nnector cons isting of two rows of 34 female pins

with adjacent pins 50 mils apart. The connector is keyed by means of its shape (see Figure 11a).

68 Barracuda 18XL Product Manual, Rev. B

9.6.4.2 Mating connectors for “LC” and “LCV” models

The nonshielded connector shall be an 80 conductor connector consisting of two rows of 40 contacts with adjacent contacts 50 ( 1.27 mm) mils apar t (see Figure 11b). I/O connection using a cable is not re commended. The length and size of the host equipmen t DC power carrying conductors fro m the DC power source to the host equipment 80 pin disk dr ive interface connector(s ) should be str ictly desig ned accordi ng to proper power transmission design concepts. No possibility for the equipment user to attach an 80 pin cable/connector should be allowed, since the length o f the DC power carr yi ng condu ctors coul d not be co ntrolled an d therefore could become too long for safe power transmission to the dri ve. Daisy-chain 80 conduc tor cables shoul d especially not be allowed, since the power-carr ying condu ctors on the 80 conductor interface were not i ntended to support a series of drives.

To insure th at both dr ive connect or an d host equip ment matin g conn ector m ate pr oper ly, both drive connector and host equipment mating c onn ec tor must me et the pr ovisions of “SF F- 80 46 S pec ifi c ation for 80-pi n co nne ctor for SCSI Disk Drives.”

9.6.4.3 Mating connectors for “N” models

The nonshielded ca ble connector sha ll be a 50 conduct or connect or cons isting of two rows of 25 female contacts with adjacent contacts 100 mils apart.

Recommended mating flat cable connector part numbers are: Closed end 3M-3425-7000 W/O Strain Relief, No Center Key

(for cable ends) [1] 3M-3425-7050 With Strain Relief, No Center Key

Dupont-66900-290 With Strain Relief, With Center Key

Open end 3M-3425-6000 W/O Strain Relief, No Center Key (In daisy-chain) [1] 3M-3425-6050 With Strain Relief, No Center Key

Dupont-66900-250 With Strain Relief, With Center Key [1] See Figure 10b. The drive device connector is a nonshiel ded 50 conductor connector consisting of two rows of 25 male pins

with adjacent pins 100 mils apart. The connector is keyed (see Figure 11c). Mating panel mount connector: 3M-CHE-2050-J01A10-KLE.

Barracuda 18XL Product Manual, Rev. B 69

Recommended mating 80-position PCBA mount connectors:

Straight-in connector Hot plug version (with ground guide-pin)

Seagate P/N: 77678703 Amp US P/N: or Amp US P/N: or

2-557103-1

94-0680-02-1

2-557103-2

94-0680-02-2

787311-1 with polarization 787311-2 without polarization

Amp Japan P/N: 5-175475-9

Right-angle to PCBA connectors

Seagate P/N: 77678559 Amp US P/N: 2-557101-1 Amp Japan P/N: 5-175474-9 For additional information call Amp. FAX service at 1-800-522-6752.

“LW” Model

Drive

[6]

SCSI ID 1

[2]

Note. Do not mix drives operating single-ended with drives operating differential on the daisy chain.

Terminator

[1]

2 through X

SCSI devices [4]

Pin 1

(check your

adapter for Pin 1 location)

SCSI ID 7 [5]

SCSI ID 0

[2]

[1]

Host Adapter

PCBA

[3]

[1] Closed-end type 68 pin connector used. Terminator required. [2] Open end type (in-line application) connector used. No terminator. [3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the

host having no terminator.

[4] Total interface cable length must not exceed that specified in AN SI Standard T10/1302D (inc luding host

adapter/initiator). The cable length restriction limits the total number of devices allowed.

[5] SCSI ID7 has highest ar bitration priority. For “LW” models, prior ity is ID7 to ID0, then ID15 to ID8 (ID 8

very lowest).

[6] Last drive on the daisy chain.

Figure 10a. SCSI daisy chain interface cabling for “LW” model drives

70 Barracuda 18XL Product Manual, Rev. B

“N” Model

Drive

[6]

SCSI ID 1

[2]

“W” Model

Drive

[6]

[7]

[1]

2 through X

SCSI devices [4]

Pin 1

(check your

adapter for Pin 1 location)

SCSI ID 7 [5]

[1]

SCSI ID 0

[2]

Host Adapter

PCB

[3]

[1] Closed-end type 58-pin connector used. Terminators on the PCB enabled. [2] Open end type (in-line application) connector used. Terminators disabled. [3] Host need not be on the end of the daisy chain. Another device can be on the end with the terminator, the

host having no terminator.

[4] Total interface cable length must not exceed that specified in AN SI Standard T10/1302D (inc luding host

adapter/initiator). The cable length restriction limits the total number of devices allowed.

[5] SCSI ID7 has highe st arbitratio n pr ior ity. ID0 has lowest for “N” models. For “W” models, priority is ID7 to

ID0, then ID15 to ID8 (ID8 is very lowest). [6] Last drive on the daisy chain. [7] Open-end type 68-pin connector used. On “W” models, install terminator enable (TE) jumper plug. “N” and

“W” drives do not require external terminators .

Figure 10b. SCSI daisy-chain interface cabling for “N” and “W” model drives

Barracuda 18XL Product Manual, Rev. B 71

3.650±.005

.100

(2.54)

.155

.050

.022

.346

1.650 .3937 .600

.519

(13.18)

1.816

(46.13)

Position 1

.315

(8.00)

.270

.0787 .200

.020 .047

.60

(15.24)

Pos.

.20

(5.08)

.085

(2.16)

typ

x 45° chamfer typ

.315 ± .010

(8.00)

.218

(5.54)

Pos. 68

.050

(1.27)

1.650

(41.91)

.980

(24.89)

1.368

(37.74)

Pos. 35

.0787 (2.00)

Pos.

(19.48)

3.650

(92.71)

Figure 11a. Nonshielded 68-pin SCSI device connector used on “LW” models

.840 ± .005

(21.34)

.767

+.001 –.002

dia

.083 (2.1)

Trifurcated Pins (4 places)

72 Barracuda 18XL Product Manual, Rev. B

7.00

(.276)

Pin 1

0.15

62.15

(2.447)

0.15

Housing

MYM

–Y–

± 0.15 (± .005)

MYM

57.87

(2.278)

Grounding

0 –0.15 + .000

[

– .006

Pins

[

of Datum Y

12.70

(.500)

End View

2.15±0.10 2 places

Front View

Insert mating I/O connector

Contact

0.50

(.020)

0.3

(.012)

MYM

1.27 (.05)

Typ

of Datum Y

Pin 1 Pin 40

Pin 41 Pin 80

Figure 11b. Nonshielded 80 pin SCSI “SCA-2” connector, used on “LC” models

Top View

Grounding

Pins

Back View

Barracuda 18XL Product Manual, Rev. B 73

77.6015.24

6.35

5.08

R 0.51 Typ.

9.27

13.89

14.86 (2X)

1.45±0.05

12.80

7.62

2.54

10.03

2.03±0.25 (3X)

Ø2.10±0.04

Trifurcated Pin

(4X)

1.27 (4X)

1.52

8.50

5.08 (3X)

6.60

R 0.73

17.65 62.23 Ref.

24.13

21.32

2 3 4

15.24

10.67

C 1.65X45° Typ.

0.50 Typ.

97.40

2.54 Typ. 0.64+0.05/–0.025

93.72 Ref.

68.58

Figure 11c. Nonshielded 50-pin connector for “N” and “W” models

60.96

Sq. Contact

1.27 Typ.

34.29

2.16

3.81

2.54 6.60

R 0.51 Typ.

74 Barracuda 18XL Product Manual, Rev. B

T a ble 13a: “LW” models SE operation 68 conductor cable signal/pin assignments (Nonshielded connector)[11]

Note.

The minus sign next to the sign al indicate s ass erted state is the low voltage o f the two levels used for logic signals.

Signal name [1]

Connector contact number [3]

Cable conductor number [2]

Connector contact number [3]

Signal name [1]

Signal Return 1 1 2 35 –DB12 Signal Return 2 3 4 36 –DB13 Signal Return 3 5 6 37 –DB14 Signal Return 4 7 8 38 –DB15 Signal Return 5 9 10 39 –DBP1 Signal Return 6 11 12 40 –DB0 Signal Return 7 13 14 41 –DB1 Signal Return 8 15 16 42 –DB2 Signal Return 9 17 18 43 –DB3 Signal Return 10 19 20 44 –DB4 Signal Return 11 21 22 45 –DB5 Signal Return 12 23 24 46 –DB6 Signal Return 13 25 26 47 –DB7 Signal Return 14 27 28 48 –DBP GND 15 29 30 49 GND GND 16 31 32 50 GND TermPwr 17 33 34 51 TermPwr TermPwr 18 35 36 52 TermPwr Reserved 19 37 38 53 Reserved GND 20 39 40 54 GND Signal Return 21 41 42 55 –ATN GND 22 43 44 56 GND Signal Return 23 45 46 57 –BSY Signal Return 24 47 48 58 –ACK Signal Return 25 49 50 59 –RST Signal Return 26 51 52 60 –MSG Signal Return 27 53 54 61 –SEL Signal Return 28 55 56 62 –C/D Signal Return 29 57 58 63 –REQ Signal Return 30 59 60 64 –I/O Signal Return 31 61 62 65 –DB8 Signal Return 32 63 64 66 –DB9 Signal Return 33 65 66 67 –DB10 Signal Return 34 67 68 68 –DB11

Notes [ ]:

See page following Table 13f.

Barracuda 18XL Product Manual, Rev. B 75

T a ble 13b: “LW” models differential cable 68 conductor signal/pin assignments (Nonshielded connector) [11]

Note.

The minus sign next to the sign al ind icate s asserted sta te is the low voltage of the two levels used for logic signals.

Signal name [1]

Connector contact number [3]

Cable conductor number [2]

Connector contact number [3]

Signal name [1]

+DB12 1 1 2 35 –DB12 +DB13 2 3 4 36 –DB13 +DB14 3 5 6 37 –DB14 +DB15 4 7 8 38 –DB15 +DBP1 5 9 10 39 –DBP1 +DB0 6 11 12 40 –DB0 +DB1 7 13 14 41 –DB1 +DB2 8 15 16 42 –DB2 +DB3 9 17 18 43 –DB3 +DB4 10 19 20 44 –DB4 +DB5 11 21 22 45 –DB5 +DB6 12 23 24 46 –DB6 +DB7 13 25 26 47 –DB7 +DBP 14 27 28 48 –DBP GND 15 29 30 49 GND DIFFSNS [8] 16 31 32 50 GND TermPwr 17 33 34 51 TermPwr TermPwr 18 35 36 52 TermPwr Reserved 19 37 38 53 Reserved GND 20 39 40 54 GND +ATN 21 41 42 55 –ATN GND 22 43 44 56 GND +BSY 23 45 46 57 –BSY +ACK 24 47 48 58 –ACK +RST 25 49 50 59 –RST +MSG 26 51 52 60 –MSG +SEL 27 53 54 61 –SEL +C/D 28 55 56 62 –C/D +REQ 29 57 58 63 –REQ +I/O 30 59 60 64 –I/O +DB8 31 61 62 65 –DB8 +DB9 32 63 64 66 –DB9 +DB10 33 65 66 67 –DB10 +DB11 34 67 68 68 –DB11

Notes [ ]:

See page following Table 13f.

76 Barracuda 18XL Product Manual, Rev. B

T a ble 13c: “LC” SE models, 80 pin I/O connector pin assignments (nonshielded connector)

Connector Signal name [1]

contact

number [3]

Signal number [3]

Contact name[1]

[11]

12 V CHARGE 1 41 12 V GND 12 V 2 42 12 V GND 12 V 3 43 12 V GND 12 V 4 44 MATED 1 NC [10] 5 45 NC [10] NC [10] 6 46 DIFFSNS [8]

–DB11 7 47 Signal Return –DB10 8 48 Signal Return –DB9 9 49 Signal Return –DB81050Signal Return –I/O 11 51 Signal Return –REQ1252Signal Return –C/D1353Signal Return –SEL1454Signal Return –MSG1555Signal Return –RST1656Signal Return –ACK1757Signal Return –BSY1858Signal Return –ATN1959Signal Return –DBP2060Signal Return –DB72161Signal Return –DB62262Signal Return –DB52363Signal Return –DB42464Signal Return –DB32565Signal Return –DB22666Signal Return –DB12767Signal Return –DB02868Signal Return –DP12969Signal Return –DB15 30 70 Signal Return –DB14 31 71 Signal Return –DB13 32 72 Signal Return –DB12 33 73 Signal Return

+5 V3474MATED 2 +5 V35755 V GND +5 V36765 V GND NC [10] 37 77 ACTIVE LED OUT [4] [9] RMT-START [5] [9] 38 78 DLYD-START [6] [9] SCSI ID (0) [7] [9] 39 79 SCSI ID (1) [7] [9] SCSI ID (2) [7] [9] 40 80 SCSI ID (3) [7] [9]

Notes [ ]

: See page following Table 13f.

Barracuda 18XL Product Manual, Rev. B 77

T a ble 13d: “LC” differential models, 80 pin I/O connector pin assignments (nonshielded connector)

Connector Signal name [1]

contact

number [3]

Signal number [3]

Contact name [1]

12 V CHARGE 1 41 12 V GND 12 V 2 42 12 V GND 12 V 3 43 12 V GND 12 V 4 44 MATED 1 NC [10] 5 45 NC [10] NC [10] 6 46 DIFFSNS [8]

–DB11 7 47 +DB11 –DB10 8 48 +DB10 –DB9 9 49 +DB9 –DB81050+DB8 –I/O 11 51 +I/O –REQ1252+REQ –C/D1353+C/D –SEL1454+SEL –MSG1555+MSG –RST1656+RST –ACK1757+ACK –BSY1858+BSY –ATN1959+ATN –DBP2060+DBP –DB72161+DB7 –DB62262+DB6 –DB52363+DB5 –DB42464+DB4 –DB32565+DB3 –DB22666+DB2 –DB12767+DB1 –DB02868+DB0 –DP12969+DP1 –DB15 30 70 +DB15 –DB14 31 71 +DB14 –DB13 32 72 +DB13 –DB12 33 73 +DB12

[11]

Notes [ ]

: See page following Table 13f.

78 Barracuda 18XL Product Manual, Rev. B

T a ble 13e: “N” model, single-ended I/O, 50 conductor, signal/contact assignments

Signal name [1]

Connector contact number [13]

Cable conductor number [12]

Connector contact number [13]

Signal name [1]

GND 1 1 2 2 –DB0 GND 3 3 4 4 –DB1 GND 5 5 6 6 –DB2 GND 7 7 8 8 –DB3 GND 9 9 10 10 –DB4 GND 11 11 12 12 –DB5 GND 13 13 14 14 –DB6 GND 15 15 16 16 –DB7 GND 17 17 18 18 –DBP GND 19 19 20 2 0 GND GND 21 21 22 2 2 GND GND 23 23 24 2 4 GND NC [10] 25* 25 26 26 TERMPWR GND 27 27 28 2 8 GND GND 29 29 30 3 0 GND GND 31 31 32 32 –ATN GND 33 33 34 3 4 GND GND 35 35 36 36 –BSY GND 37 37 38 38 –ACK GND 39 39 40 40 –RST GND 41 41 42 42 –MSG GND 43 43 44 44 –SEL GND 45 45 46 46 –C/D GND 47 47 48 48 –REQ GND 49 49 50 50 –I/O

*CAUTION:

Notes [ ]

: See page following Table 13f.

Connector contact 25 must not be connected to ground at the hos t end or the drive end of the

cable. If the I/O cable should accidently be pl ugged in upside down, ter minator power on pin 26 will be shorted to ground.

Barracuda 18XL Product Manual, Rev. B 79

T a b l e 13f: “W” model, single-ended I/O cable, 68 conductor, signal/contact assignments

Signal name [1]

Connector

contact

number [3]

Cable conductor number [2]

Connector contact number [3]

Signal name [1]

GND 1 1 2 35 –DB12 GND 2 3 4 36 –DB13 GND 3 5 6 37 –DB14 GND 4 7 8 38 –DB15 GND 5 9 10 39 –DBP1 GND 6 11 12 40 –DB0 GND 7 13 14 41 –DB1 GND 8 15 16 42 –DB2 GND 9 17 18 43 –DB3 GND 10 19 20 44 –DB4 GND 11 21 22 45 –DB5 GND 12 23 24 46 –DB6 GND 13 25 26 47 –DB7 GND 14 27 28 48 –DBP GND 15 29 30 49 GND GND 16 31 32 50 GND TermPwr 17 33 34 51 TermPwr TermPwr 18 35 36 52 TermPwr Reserved 19 37 38 53 Reserved GND 20 39 40 54 GND GND 21 41 42 55 –ATN GND 22 43 44 56 GND GND 23 45 46 57 –BSY GND 24 47 48 58 –ACK GND 25 49 50 59 –RST GND 26 51 52 60 –MSG GND 27 53 54 61 –SEL GND 28 55 56 62 –C/D GND 29 57 58 63 –REQ GND 30 59 60 64 –I/O GND 31 61 62 65 –DB8 GND 32 63 64 66 –DB9 GND 33 65 66 67 –DB10 GND 34 67 68 68 –DB11

Notes [ ]

: See page following this Table.

80 Barracuda 18XL Product Manual, Rev. B

Notes [ ] for Tables 13a through 13f.

[1] See Section 9.7.1 or 9.7.2 for detailed electrical characteristics of these signals. [2] The conduc tor number r efers to the condu ctor pos ition wh en using 0.025-inch (0.635 m m) cent erline flat

ribbon cable. Other cables types may be used to implement equivalent contact assignments. [3] Connector contacts are on 0.050 inch (1.27 mm) centers. [4] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator. [5] Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command). [6] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 sec-

onds times drive ID). This and [5] above are mutually exclusive options. [7] Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive. [8] GND provides a means for differential devices to detect the presence of a single ended device on the bus.

Drive will not operate I/O bus at Ultra-2 or Ultra160 data rates if this is grounded. [9] Signals [4 ] through [7] are used in place of in stalling jump ers and cables o n option selec t connectors J2

and J6. See Section 8.1.1 notes. [10] “NC” means no connection. [11] 8 bit devices which are connected to the 16 data bit differential I/O shall leave the following signals open:

–DB12 –DB13 –DB14 –DB15 –DBP1 –DB8 –DB9 –DB10 –DB11,

+DB12 +DB13 +DB14 +DB15 +DBP1 +DB8 +DB9 +DB10 +DB11. 8 bit devices which are connected to the 16 data bit single-ended I/O shall have the following signals connected as shown:

to ground: +DB12 +DB13 +DB14 +DB15 +DBP1 +DB8 +DB9 +DB10 +DB11,

open circuit: –DB12 –DB13 –DB14 –DB15 –DBP1 –DB8 –DB9 –DB10 –DB11. All other signals should be connected as shown.

[12] The conductor number refers to the conductor posi tion (ri ght to left in Figure 10b) when using 0.050 inch

(1.27 mm) centerline fla t ribbon cable. Other cable types may be used to implement equivalent contact assignments.

[13] Connector contacts are on 0.100 inch (2.54 mm) centers.

Barracuda 18XL Product Manual, Rev. B 81

9.7 Electrical description

“LC” models use the single connection attachment (SCA) connector. This 80-pin connector is designed to plug directly into a back panel or plane. N o extern al c ables are req uir ed . Ac ti ve ter min ato rs on the back panel must be provided by the user. This connector is not recommended where cabling is required.

“LC” and “LW” models are Multimode drives. That is, their I/O circuits can operate as either single-ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line). They require external terminators. See Section 9.7.2 for additional information on these models.

“N” and “W” models use single-ended interface signals. These signals must be terminated with 110-ohm active terminatio n circuits at eac h end of the tot al cable. Single-ende d circuits use open coll ector or thr ee state dr ivers. These models can be configured to provide the SCSI termination.

Note.

The SCSI protocol chip dr ives the upp er eight da ta and pari ty bits of the SCSI bus even when operating in narrow (eight bit) mode. This is nor mal operation for this chip. If the unused data bit signals are connected to conductor s tha t extend out beyond this drive’s SCSI connector, correct termin ation mus t be provided for these unused signals at the device/system at each end of the bus onto which this drive is connected. Termination is required to control radiated emissions and conducted noise on other SCSI bus signals.

9.7.1 Single-ended drivers/receivers

For “N” a nd “W” mo dels which use sin gle- ended d rivers and re ceivers, typical circ uits a re shown in Fig ure 12 . Terminator circuits (Note [1]) are to be enabled only when the disc drive is first or last in the daisy-chain.

Transmitter characteristics

Single-ended drives use an ANSI SCSI compatible open collector single-ended driver. This driver is capable of sinking a current of 48 mA with a low level output voltage of 0.4 volt.

Receiver characteristics

Single-ended drives use an ANSI SCSI single-ended receiver with hysteresis gate or equivalent as a line receiver.

Line Driver

Transmitter

(or transceiver)

TP TP

[4]

Flat

Cable

Pair

[1]

110

Ohm

Line Receiver

[4]

[1]

Receiver

110

Ohm

[5]

[3]

[2]

Figure 12. Single-ended transmitter s and rece ivers on “N” and “W” models

[2]

Notes.

[1] Part of ac tive terminator circuits. Non-re movable LSI ter minators, enabled in the drive (mode ls “N” and

“W” only) with jumper plug TE when it is first of last in the daisy-chain.

[2] ANSI SCSI compatible circuits. [3] Total interface cable length should not exceed that specified in ANSI Standard T10/1302D. [4] Source of drive terminator power is an active circuit which has an input source voltage selected by jumper

plug TP. See Figure 7d. Applies to “N” and “W” models.

[5] Interface signal levels and logical s ense at th e dr ive I/O conne ctor for “N” and “W” model s are define d as

follows: Vil (low-level input voltage) = 1.0 V maximum (signal true) ; minimum = Vss – 0.5 V.

Vih (high-level input voltage) = 1.9 V minimum (signal false); maximum = Vdd +0.5V. Vihys (Input Hysteresis) = 425 mV minimum

82 Barracuda 18XL Product Manual, Rev. B

See ANSI Standard T10/1302D (SPI-3) for detailed electrical specifications.

9.7.2 Multimode—SE or LVD alternative

“LW” and “LC” models have I/O circuits that can op erate either in single-en ded (SE) or low voltage differential mode (LVD). When the interface “DIFFSNS” line is between 0 V and .6 V, the dr ive interface circuits operate single-ended and up to a nd inc lud ing 20 M tran sfers/s (Fast-20 or Ultra-1 SCSI). Whe n “DIFFSNS” is be tween +0.7 V and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 80 M transfers/sec or less. This arrangement is not intended to allow dynamically changing transmission modes, but rather to prevent incompatible devices from attempting to interoperate. Multimode I/O circuits used by “LC” and “LW” devices do not operate at high voltage differential levels and should never be exposed to high voltage differential environments unless the com mon mode voltages in the environment are contr olled to safe levels for single-ended and low voltage differential devices (see the ANSI SPI-3 specification T10/1302D).

Multimode signals

Multimode circuit SE alternative logic sense and signal level characteristics are described as follows:

Vil (low-level input voltage) = 1.0 V maximum (signal true); minimum = Vss – 0.5 V Vih (high-level input voltage) = 1.9 V minimum (signal false); maximum = Vdd +0.5V Vihys (Input Hysteresis) = 425 mV minimum

Multimode circuit LVD alternati ve signal characterist ics are not the same as high voltage differential signals (HVD). This drive does not support HVD. It should never be connected to an HVD bus. The SCA-2, 80-pin connector signal/pin assignments are shown in Tables 13b and 13d, but the electrical characteristics of the signals are not the same. “LC” and “LW” model dr ives do not have onboard ter minators. The Mu ltimode signal lines (either SE or LV D) should be terminated with 110 ohm acti ve termina tor circuit s at each end of the tota l cable. Termination of the I/O lines must be provided for by the Host equipment designers or end users.

The SE and differential alternatives are mutually exclusive.

Output characteristics

Each LV D sign al ( V

) driven by LVD inte rface dri vers shall have output ch aracteristics as described in this sec-

tion when measured at the disc drive connector (refer to f igure 13). A signal that is “released” goes to the negated (false or logic 0) state be cause th e bias o f the ter mi nator pulls the si gnal levels to the negate d state. Refer to paragraphs 7.2.2, and Annex A of ANSI SPI-3 specification, T10/1302D for details. The output characteristics shall additionally conform to EIA RS-485.

Table 14: Drive steady state limits and conditions (T10/1302D, Annex A, Table A.2)

Test parameter V

| VA | Differential output voltage

magnitude (asserted) [1]

| Differential output voltage

| V

magnitude (negated) [1]

| Differential output voltage

| V

magnitude (asserted)

Test conditions (figure 13) Minimum (mV) Maximum (mV)

V1=1.056 V, V2=0.634 V V1=1.866 V, V2=1.444 V V1=1.056 V, V2=1.444 V V1=1.866 V, V2=1.444 V All four above conditions 0,69 x | VN | + 50

375 800 375 800 375 800 375 800

1,45 x | VN | – 65

[1] The test circuit (figure 13) is approximately equivalent to two terminators creating the normal system bias.

Barracuda 18XL Product Manual, Rev. B 83

STEADY STATE LOGIC INPUT

–SIGNAL

100Ω

(1 OR 0)

75Ω

100Ω

+SIGNAL

MEASURED PARAMETER

DEVICE CONNECTOR

Note.

Resistors are ± 0.1%

Figure 13. LVD steady-state output voltage test circuit (T10/1302D, Annex A, Figure 1)

Input characteristics

Each signal (Vs) recei ved by LVD interface recei ver circuits sh all have the following input character isti cs when measured at the disk drive connector:

Steady state Low level output voltage* = 0.030 V = < V Steady state High level output voltage* = –3.6 V = < V Differential voltage = +

0.30 V minimum with common-mod e voltage ranges 0.7 00 V = < Vcm = < 1.800 V. (T10/

= < 3.6 V (signal negation/logic 0)

= < –0.030 V (signal assertion/logic 1)

1302D, SPI-3) *These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference. Input characteristics shall additionally conform to EIA RS-485-983.

VCCA VCCB

Single Ended Circuitry

Single Ended Ground Driver

Ground

Single Ended: LVD:

GND

+Signal

Figure 14. Typical SE-LVD alternative transmitter receiver circuits

LVD Signal Drivers

LVD

Receiver

LVD Signal Drivers

Single Ended Receiver

–Signal –Signal

Single Ended Negation Driver

Single Ended Assertion Driver

84 Barracuda 18XL Product Manual, Rev. B

9.8 Terminator requirements

“N” and “W” models have active, permanently mounted LSI terminator circuits on board the PCB. All single initiato r/single targ et (non-daisy -chain) appli cations req uire that the Initia tor and disc dr ive be termi-

nated. Daisy-chain applications require tha t only the units at eac h end of the daisy-chain b e terminated. All other peripherals on the chain must not be terminated (see Figure 10a).

Note.

It is required that ANSI SCSI -2 Standard’s Alternative 2 termina tion (active termination) be us ed for applications with single-ended mode, especially if the bus will be operated at transfer rates above 5 Mbytes/sec.

Note.

Drive models “LW” and “LC” do not have internal ter minators available. The user, systems integrator or host equipment manufacturer must provid e a terminator ar rang eme nt extern al to the drive. For “LW” models, terminator modules can be purc hased that plug b etween the SCSI I/O cable and the dr ive I/O connector or on th e end of a short I/O cable stub extending past the last cable connector.

ANSI Standard X3T10/1143D contains additional details about SCSI bus terminator and terminator power requirements.

9.9 Terminator power “LW” model drives

You can configure terminator power in two different ways. See Section 8.1 for illustrations that show how to place jumpers enabling each of the following terminator power configurations:

1. The external terminator accepts terminator power through SCSI bus pins 17, 18, 51, and 52.

2. Drive supplies terminator power to the SCSI bus on pins 17, 18, 51, and 52.

Remove drive terminator enabling jumper TE where terminators are not required. Removal of terminator power source selection jumper TP (see Figure 7d) does not disconnect the ter minator resistors from the circuit.

ACTIVE TERMINATORS ARE REQUIRED FOR USE IN THE DAISY CHAIN AS DESCRIBED ABOVE. PASSIVE TERMINATORS SHALL NOT BE USED AT ANY TRANSFER SPEED. ACTIVE AND PASSIVE TERMINATORS SHALL NOT BE MIXED ON THE SAME SCSI BUS.

SCSI devices providing terminator power (TERMPWR) must have the following characteristics: 8-bit SCSI V TERM = 4.25 V to 5.25 V

800 mA minimum source drive capability

1.0 A maximum

16-bit SCSI V TERM = 4.25 V to 5.25 V

1,500 mA minimum source drive capability

3.0 A maximum

“LC” model drives

These drives cannot fu rn ish t er mi nator power bec ause n o con ductors in the 80-pin I /O co nnecto r ar e devoted to terminator power.

“N” and “W” model drives

You can config ure terminator power in four different ways. See Section 8.1 for illustrations that show h ow to place jumpers enabling each of the following terminator power configurations:

1. Drive accepts terminator power through SCSI bus pins:

“N” ModelsPin 26 “W” ModelsPins 17, 18, 51, and 52

2. Drive supplies power to the SCSI bus.

3. Drive provides terminator power for optional internal terminator resistors using the drive’s power connector.

4. Drive provides power to its own terminators and to the SCSI bus terminator power line.

Barracuda 18XL Product Manual, Rev. B 85

SCSI devices providing terminator power (TERMPWR) must have the following characteristics: 8-bit SCSI V TERM = 4.25 V to 5.25 V

800 mA minimum source drive capability

1.0 A maximum

16-bit SCSI V TERM = 4.25 V to 5.25 V

1,500 mA minimum source drive capability

3.0 A maximum

9.10 Disc drive SCSI timing

Table 15: Disc drive SCSI timing

These values are not current Barracuda 18XL values, but are listed for information only.

Description

Waveform symbol [1]

Waveform table [1] Typical timing

Target Select Time (no Arbitration) T00 N/A <1.4 µs

Target Select Time (with Arbitration) T01 4.5-1,2 1.93 µs

Target Select to Command T02 4.5-1 3.77 µs

Target Select to MSG Out T03 4.5-2 1.57 µs

Identify MSG to Command T04 4.5-3 3.36 µs

Command to Status T05 4.5-5 Command Dependent

Command to Data (para. In) T06 4.5-9 Command Dependent

Command to Data (para. Out) T07 4.5-10 Command Dependent

Command to Data (Write to Data Buffer) T08 4.5-10 Command Dependent

Command to Disconnect MSG T09 4.5-6 Command Dependent

Disconnect MSG to Bus Free T10 4.5-6,14 0.52 µs

Disconnect to Arbitration (for Reselect)

T11 4.5-6 Command Dependent

This measures disconnected CMD overhe ad Target win Arbitration (for Reselect) T12 4.5-7 3.00 µs Arbitration to Reselect T13 4.5-7 1.60 µs Reselect to Identify MSG In T14 4.5-7 1.39 µs Reselect Identify MSG to Status T15 4.5-8 Command Dependent Reselect Identify MSG to Data (media) T16 4.5-11 Command Dependent Data to Status T17 4.5-15 Command Dependent Status to Command Complete MSG T18 4.5-5,8,15 0.98 µs Command Complete MSG to Bus Free T19 4.5-5,8,15 0.51 µs Data to Save Data Pointer MSG T20 4.5-14 4.00 µs Save Data Pointer MSG to Disconnect MSG T21 4.5-14 0.79 µs Command Byte Transfer T22 4.5-4 0.04 µs Next Command Byte Access: 4.5-4

Next CDB Byte Access (Byte 2 of 6) T23.6.2 4.5-4 0.58 µs

Next CDB Byte Access (Byte 3 of 6) T23.6.3 4.5-4 0.12 µs

Next CDB Byte Access (Byte 4 of 6) T23.6.4 4.5-4 0.12 µs

Next CDB Byte Access (Byte 5 of 6) T23.6.5 4.5-4 0.12 µs

Next CDB Byte Access (Byte 6 of 6) T23.6.6 4.5-4 0.12 µs

Next CDB Byte Access (Byte 2 of 10) T23.10.2 4.5-4 0.59 µs

Next CDB Byte Access (Byte 3 of 10) T23.10.3 4.5-4 0.11 µs ±1 µs

86 Barracuda 18XL Product Manual, Rev. B

Table 15: Disc drive SCSI timing

These values are not current Barracuda 18XL values, but are listed for information only.

Description

Waveform symbol [1]

Waveform table [1] Typical timing

Next CDB Byte Access (Byte 4 of 10) T23.10.4 4.5-4 0.12 µs ±1 µs Next CDB Byte Access (Byte 5 of 10) T23.10.5 4.5-4 0.11 µs ±1 µs Next CDB Byte Access (Byte 6 of 10) T23.10.6 4.5-4 0.11 µs ±1 µs Next CDB Byte Access (Byte 7 of 10) T23.10.7 4.5-4 0.13 µs ±1 µs Next CDB Byte Access (Byte 8 of 10) T23.10.8 4.5-4 0.12 µs ±1 µs Next CDB Byte Access (Byte 9 of 10) T23.10.9 4.5-4 0.12 µs ±1 µs

Next CDB Byte Access (Byte 10 of 10) T23.10.10 4.5-4 0.12 µs ±1 µs Data In Byte Transfer (parameter) T24 4.5-12 0.04 µs Data Out Byte Transfer (parameter) T25 4.5-13 0.04 µs Next Data In Byte Access (parameter) T26 4.5-12 0.12 µs Next Data Out Byte Access (parameter) T27 4.5-13 0.12 µs Data In Byte Transfer (media) [2] T28 4.5-12 0.04 µs Data Out Byte Transfer (media) [2] T29 4.5-13 0.04 µs Next Data In Byte access (media [2] T30 4.5-12 0.12 µs Next Data Out Byte access (media [2] T31 4.5-13 0.12 µs MSG IN Byte Transfer T32 4.5-5,7,8,14,15 0.04 µs MSG OUT Byte Transfer T33 4.5-2 0.04 µs STATUS Byte Transfer T34 4.5-5,8,1 5 0.04 µs Synchronous Data Transfer Characteristics:

Request Signal Transfer Period [3] –– various (800 ns max)

Notes.

[1] See the SCSI Inte rface Product Manual, part number 75789509. [2] Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual. [3] Synchronous Transfe r Period is de termined by negotiations between an Init iator an d a Drive. The Drive is

capable of setting perio ds as given in Section 9.5. See also the Synchr onous Data Transfer section and the Extended Message s section in the SCSI Interface Product Manual, for a description of synchronous data transfer operation.

Barracuda 18XL Product Manual, Rev. B 87

10.0 Seagate Technology support services Online Services

Internet

www.seagate.com

hours daily by e-mail for your disc or tape questions.

Presales Support:

Disc: www.seagate.com/support/email/email_presales.html or DiscPresales@Seagate.com. Tape: www.seagate.com/support/email/email_tape_presales.html or Tape_Sales_Support@Seagate.com.

Technical Support:

Disc: www.seagate.com/support/email/email_disc_support.html or DiscSupport@Seagate.com . Tape: www.seagate.com/support/email/email_tape_support.html or TapeSupport@Seagate.com. Server Appliance: www.seagate.com/support/email/email_nas_support.html or NAS_Support@Seagate.com.

Reseller Marketplace

Reseller Marketplace is the storage industry’s first collaborative, e-commerce marketplace offering res ellers the fastest, most efficient online purcha sing process for Seagate storage so lutions. The Reseller Marketplace at marketplace.seagate.com, an exclusive ser vice for US resellers partici pating in the Seagate Partner Program (SPP), is designed to streamline the purchasing process of Seagate solutions and provide unprecedented value to Seagate’s resellers through real-time pricing and availability, fast and easy comparison shopping, and seamless integration with key distributors for a one-stop shopping experience.

for information about Sea gate products and ser vices. Worldwide suppor t is available 24

For support, q uestions and comments: resel ler.seagate.com/benefits/T1.htm l or 1-877-271-3285 (toll-fr ee) 9

. to 7 P.M. (eastern time) Monday through Friday.

A.M

Tape Purchases

US customers can purc hase Seagate data cartri dges, tape supplies, accessories, and selec t Seagate tape drive products 24 hours daily at buytape.seagate.com.

SeaBOARD

products and is available 24 hours daily . Set your communications software to eight data bits, no parity and one stop bit (8-N-1).

is a computer bulletin board sy st em tha t co ntai ns information about Seagate disc and tape drive

Automated Services

SeaFONE® (1-800-SEAGATE)

help service s. Using a touch-tone phone, you can fin d answers to service ph one numbers, commonly a sked questions, troubleshooting tips and specifications for disc dri ves and tape drives 24 hours daily. International callers can reach this service by dialing +1-405-936-1234.

SeaFAX

support information by return FAX 24 hours daily. This service is available worldwide.

is Seagate’s automated FAX delivery system. Using a touch-tone phone, you can obtain tech nical

is Seagate’s toll-free number (1-800-732- 4283) to access our a utomated self-

Presales Support

Our Presales Suppor t staff can he lp you determine whic h Seagate products are bes t suited for your specific application or computer system.

88 Barracuda 18XL Product Manual, Rev. B

Technical Support

If you need help installing your drive, consult your dealer. Dealers are familiar with their unique system configurations and can help you with system confl icts and other tec hnica l issues. If you need add ition al help, you can talk to a Seagate tec hnical sup por t specia list. Before callin g, note your sy stem configurat ion and dr ive model number (ST####).

SeaTDD™ (+1-405-936-1 687)

comments 24 hours daily and exchange messages with a technical support specialist from 8:00 11:45

. and 1:00 P.M. to 6:00 P.M. (central time) Monday through Friday.

A.M

is a telecommuni cations device for the deaf (TDD) . You c an send q uestions or

. to

A.M

Customer Service (CSO)

Warranty Service

Seagate offers worldwide customer supp or t for Seagate drives. Seagate direct OEM, Distri bution and System Integrator customers should contact their Seagate service center representative for warranty information. Other customers should contact their place of purchase.

Authorized Service Center s

If you live outside the US, you can contact an Authorized Service Center for service.

USA/Canada/Latin America Support Services

Presales Support

Call Center Toll-free Direct dial FAX

Disc: 1-877-271-3285 +405-936-1210 +1-405-936-1683 Tape: 1-800-626-6637 +1-714-641-2500 +1-714-641-2410 Server Appliance: 1-800-732-4283 +1-405-936-1234 +1-405-936-1683

Technical Support (SeaFONE)

1-800-SEAGATE or +1-405-936-1234 (for specific product phone number) FAX: Disc: +1-405-936-1685; Tape and Server Appliance: +1-405-936-1683

SeaFAX SeaTDD SeaBOARD

1-800-SEAGATE

+1-405-936-1687 Disc: +1-405-936-1600; Tape: +1-405-936-1630

Warranty Service

Call Center Toll-free Direct dial FAX / Internet

USA 1-800-468-3472 +1-405-949-7758 +1-405-949-6740 Mexico and Latin America — +1-405-949-7758 +1-405-949-6738 Canada

Memofix* 1-800-636-6349 +1-905-660-4936 or +1-905-660-4951

www.memofix.com

Adtech* 1-800-624-9857 +1-905-812-8099 or +1-905-812-7807

www.adtech1.com

Brazil

MA Informatica* — +55-21-516-6649 +55-21-223-3156

e-mail: sgt_cso@gbl.com.br

*Authorized Service Centers

Barracuda 18XL Product Manual, Rev. B 89

European Support Services

For European customer support, dial the toll-free number for your specific country for presales support, technical support, SeaFAX and warranty service.

If your country is not liste d here, dial our Eu ropea n call c enter at +31- 20-3 16-7222 from 8 :30 (European central time) Mon day through Friday. The European call cen ter is lo ca ted i n A ms ter dam , The Ne therlands.

Call Center

Austria 0 800-20 12 90 Belgium 0 800-74 876 Denmark 80 88 12 66 France 0 800-90 90 52 Germany 0 800-182 6831 Ireland 1 800-55 21 22 Italy 800-790695 Netherlands 0 800-732 4283 Norway 800-113 91 Poland 00 800-311 12 38 Spain 900-98 31 24 Sweden 0 207 90 073 Switzerland 0 800-83 84 11 Turkey 00 800-31 92 91 40 United Kingdom 0 800-783 5177

. to 5:00 P.M.

A.M

SeaBOARD

Germany +49-89-1409331

Fax Services—All European Countries

Presales/Technical Support/Warranty Service 31-20-653-3513

Africa/Middle East Support Services

For presales, technical suppor t, warranty service and FAX services in Africa and the Middle East, dial our European call ce nter at +31- 20-316- 7222 fr om 8:3 0 Friday, or send a FAX to +31-20-653-3513. The Eu ropean call center is loca ted in Amsterdam, The Netherlands.

. to 5:00 P.M. (European central ti me) Monday throug h

A.M

Asia/Pacific Support Services

For Asia/Pacific presales and technical suppor t, dial the toll-free number for your specific co untry. The Asia/ Pacific toll-free numbers are available from 6:00 ern time) Monday through Friday. If your country is not listed here, direct dial one of our technical support locations.

Call Center Toll-free Direct dial FAX

Australia 1800-14-7201 +61-2-9725-3366 +61-2-9725-4052 Hong Kong 800-90-0474 — +852-2368 7173 Indonesia 001-803-1-003-2165 —— Japan ——+81-3-5462-2979 Singapore 800-1101-150 +65-488-7584 +65-488-7528 Taiwan — +886-2-2514-2237 +886-2-2715-2923 Thailand 001-800-11-0032165 ——

Warranty Service

Call Center Toll-free Direct dial FAX

Asia/Pacific and Australia — +65-485-3595 +65-488-7503 Japan — +81-3-5462-2904 +81-3-5462-2979

. to 10:45 A.M. and 12:00 P.M. to 6:00 P.M. (Australian east-

A.M

90 Barracuda 18XL Product Manual, Rev. B

seagate ST318436LW, ST318436LC, ST318436LWV, ST318436LCV, ST318426LW Product Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

1.0 Scope

2.0 Applicable standards and reference documentation

2.1 Standards

2.1.1 Electromagnetic compatibility

2.1.2 Electromagnetic susceptibility

2.2 Electromagnetic compliance

2.3 Reference documents

3.0 General description

3.1 Standard features

3.2 Media characteristics

3.3 Performance

3.4 Reliability

3.5 Unformatted and formatted capacities

3.6 Programmable drive capacity

3.7 Factory installed accessories

3.8 Options (factory instal led)

3.9 Accessories (user installed)

4.0 Performance characteristics

4.1 Internal drive characteristics (transparent to user)

4.2 SCSI performance characteristics (visible to user)*

4.2.1 Access time [8]*

4.2.2 Format command execution time (minutes) [1]*

4.2.3 Generalized performance characteristics

4.3 Start/stop time

4.4 Prefetch/multi-segmented cache control

4.5 Cache operation

4.5.1 Caching write data

4.5.2 Prefetch operation

4.5.3 Optimizing cache performance for desktop and server applications

5.0 Reliability specifications

5.1 Error rates

5.1.1 Environmental interference

5.1.2 Read errors

5.1.3 Write errors

5.1.4 Seek errors

5.2 Reliability and service

5.2.1 Mean time between failure

5.2.2 Preventive maintenance

5.2.3 Service life

5.2.4 Service philosophy

5.2.5 Service tools

5.2.6 Hot plugging Barracuda 18XL disc drives

5.2.7 S.M.A.R.T.

5.2.8 Drive Self Test (DST)

5.2.8.1 DST Failure Definition

5.2.8.2 Implementation

5.2.8.2.1 State of the drive prior to testing

5.2.8.2.2 Invoking DST

5.2.8.2.3 Check condition

5.2.8.2.4 Immediate and non-immediate modes

5.2.8.2.5 Short and extended tests

5.2.8.2.6 Log page entries

5.2.8.2.7 Self-Test Progress Indicator

5.2.8.2.8 Abort

5.2.9 Product warranty

6.0 Physical/electrical specifications

6.1 AC power requirements

6.2 DC power requirements

6.2.1 Conducted noise immunity

6.2.2 Power sequencing

6.2.3 Current profile

6.3 Power dissipation

6.4 Environmental limits

6.4.1 Temperature

6.4.2 Relative humidity

6.4.3 Effective altitude (sea level)

6.4.4 Shock and vibration

6.4.4.1 Shock

6.4.4.2 Vibration

6.4.5 Air cleanliness

6.4.6 Acoustics

6.4.7 Electromagnetic susceptibility

6.5 Mechanical specifications

7.0 Defect and error management

7.1 Drive internal defects