seagate ST318203LW, ST318203LWV, ST318203LC, ST318203LCV User Manual

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Cheetah 18LP Fa mil y :

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ST318203LW/LWV/LC/LCV

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ST318233LWV/LCV

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ST39103LW/LWV/LC/LCV

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ST39133LWV/LCV

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Product Manual, Volume 1

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Cheetah 18LP Fa mil y :

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ST318203LW/LWV/LC/LCV

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ST318233LWV/LCV

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ST39103LW/LWV/LC/LCV

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ST39133LWV/LCV

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Product Manual, Volume 1

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Publication number: 83329400, Rev. F

February 2000

Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Tec hnology, Inc. Cheetah, SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trademar ks or registered trademarks of Seagate Technology, Inc. or one of its subsidiaries. All other trademar ks or registered trademarks are the property of their respective owners.

Seagate reserves the right to chang e, without notice, product offerings or specifications. No part of this

publication may be reproduced in any for m without written permission of S eagate Technology, Inc.

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

Rev. A 12/01/98 L. Newman/D. Rusch 9, 10, 24, 25, 43, Rev. B 01/12/99 L. Newman/D. Rusch 7, 33, 45 and 47. Rev. C 02/19/99 L. Newman/D. Rusch Adds ST39103LW/LC data and rewords

references to the SCSI I/O Manual. Pages 5, 8, 9, 14, 19, 21, 22, 23, 24, 25, 31, 32,

46, 47, 50, 51, 52, 53, 54, 55, 63, and 67. Rev. D 05/18/99 L. Newman/D. Rusch 14, 19, 23, 24, 32, and 64. Rev. E 06/15/99 L. Newman/D. Rusch 14, 28, and 30. Rev. F 2/21/ 2000 L. Newman/G. Velaski 1, 3-5, 7-11, 14, 19-23, 25-29, 31-33,

35-37, 39-41, 45-49, 51-62, 67-69, 71,

and 73-75.

Notice. Product Manual 83329400 is Volume 1 of a two volume document with the SCSI Interface information in

the Volume 2 SCSI Interface P roduct Manual. If you need the SCSI Interface information for ST318203 or ST39103 models, order SCSI Interfac e Ma n-

ual, part number 7773 8479. If you need the SCSI Interface information for ST318233 or ST3 9133 models, order SCSI Interface Manual, part number 75789509.

Cheetah 1 8LP Product Manual, Re v. F vii

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 d ocuments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 General descr iption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

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

3.4 Reliabili ty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 characte ristics (visible to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.1 Access tim e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.2 Format comm and ex ecution time (minute s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.4 Prefetch/m ulti-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.5.2 Prefetch o peration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1 Error rate s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.3 Write erro rs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.2 Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4

5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.2 Field failure rate vs time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.3 Preve ntive maintenan ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.4 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.5 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.6 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.7 Hot plugging Cheetah 18LP disc drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.8 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5.2.9 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9

6.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.2.1 Conduct ed noise immu nity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.2 Power sequenc ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.3 12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.3 Power dissi pation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3

6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

viii Cheetah 18LP Product Manual, Rev. F

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

6.4.4 Shock and vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

6.4.4.1 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

6.4.4.2 Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

7.0 Defect and error manageme nt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

7.1 Drive inte rnal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

7.2 Drive erro r recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

7.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7

8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

8.1.1 Notes for Figures 19, 20, and 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

8.3.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

9.1 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

9.3 SCSI interface commands suppo rted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

9.4 SCSI bus conditions and miscellaneous features support ed . . . . . . . . . . . . . . . . . . . . . . . . .53

9.5 Synchronous data trans fer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.1 Synch ronous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.5.2 REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

9.6 Physical i nterface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

9.6.3 SCSI interface cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

9.6.4.1 Ma ting conn ectors for LW and LWV model drives . . . . . . . . . . . . . .58

9.6.4.2 Ma ting conn ectors for LC and LCV model drives. . . . . . . . . . . . . . .59

9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.7.1 Multimo de—SE and LV D alternatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

9.7.1.1 S ingle -ended drivers/recei vers. . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

9.7.1.2 Low v oltage differential I/O circuits. . . . . . . . . . . . . . . . . . . . . . . . . .69

9.7.1.3 General cable characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

9.8 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

9.11 Drive activity LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

10.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

Cheetah 1 8LP Product Manual, Re v. F ix

List of Figures

Figure 1. Cheetah 18LP family drive (LW model shown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Cheetah 18LP family drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. Typical ST318203 and ST318233 drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 4. Typical ST39103 and ST39133 d rive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 5. Typical ST318203 and ST318233 dri ve +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 6. Typical ST39103 and ST39133 drive +5 V current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 7. ST318203 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . 23

Figure 8. ST318203 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . 23

Figure 9. ST39103 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . . 24

Figure 10. ST39103 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . . 24

Figure 11. ST318233 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . 25

Figure 12. ST318233 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . 25

Figure 13. ST39133 DC current and power vs. input/output operations per second (SE) . . . . . . . . . . . 26

Figure 14. ST39133 DC current and power vs. input/output operations per second (LVD) . . . . . . . . . . 26

Figure 15. Locations of PCBA components listed in Tables 3 and 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 16. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 17. LW and LWV mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 18. LC and LCV mounting configuration dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 19. J6 jumper header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 20. J5 jumper header (on LW and LWV models only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 21. J2 option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 22. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 23. LW and LWV model drive physical interface (68-pin J1 SCSI I/O connector) . . . . . . . . . . . . 56

Figure 24. LC and LCV model drive physical interface (80-pin J1 SCSI I/O connector). . . . . . . . . . . . . 56

Figure 25. SCSI daisy chain interface cabling for LW and LWV drives. . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 26. Nonshielded 68 pin SCSI device connector used on LW and LWV drives . . . . . . . . . . . . . . 61

Figure 27. Nonshielded 80 pin SCSI “SCA-2” connector, used on LC and LCV drives . . . . . . . . . . . . . 62

Figure 28. LVD output signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 29. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Cheetah 1 8LP Product Manual, Re v. F 1

1.0 Scope

This manual describes Seagate Technology®, Inc. Cheetah 18LP™ disc drives. ST318203 and ST3 9103 drives suppor t the s m all c omp uter s ystem in terface (SCSI) as des cribed in the ANSI

SCSI, SCSI-2, and SCSI-3 (Fast-20 and Fast-40) interface specifications to the extent described in this manual. The SCS I I nte rface Product M anual (par t num ber 77738479) descr ibes g eneral S CSI interface characteristics of these Seagate drives.

ST318233 and ST3 9133 drives suppor t the s m all c omp uter s ystem in terface (SCSI) as des cribed in the ANSI Ultra160 interface specifications to the extent described in this manual. The SCSI Interface Product Manual (part number 75789509) desc rib es general SCSI interface characteristics of these Seagate drives.

From this point on in this prod uct manual the reference to Cheetah 18LP models is referred to as “the drive” unless references to individual models are necessary.

Figure 1. Cheetah 18LP family drive (LW model shown)

2 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 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 its hos t equipment to provide adequate power and environment in order to ach ieve optimum performance and compliance with applicable industry a nd governmental 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 m ount ed in o rder to guarante e the s pecified pe rform ance c haracteristics. Mounting by bottom holes must meet the requirements of Section 8.4.

2.1 Standards

ST318203 and ST39103 dr ives comply with Seagate standards as noted in the appropriate sections of this Manual and the Seagate SCSI Interface Product Manual, part number 77738479.

ST318233 and ST39133 dr ives comply with Seagate standards as noted in the appropriate sections of this Manual and the Seagate SCSI Interface Product Manual, part number 75789509.

Cheetah 18LP disc dri ves are a UL rec ognized com pone nt per UL1950, CSA certified to CSA C2 2.2 No. 950M89, and VDE certified to VDE 0805 and EN 60950 .

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 supplied as a subassembly and is not subject 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 requirements in their system. Shielded I/O cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external 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 assem bly, the drive is not required to me et any suscep tibility performance requi remen ts. It is the responsibility of those integrating the dri ve within their system s to perform t hose t ests req uired and design their system to ensure that equipment operating in the same system as the drive or external to the system does not adversely affect the performance of the drive. See Section 5.1.1 and Table 2, DC power requirements.

2.2 Electromagnetic compliance

Seagate uses an independen t laboratory to confirm complia nce to the directives/standard(s) for CE Marking 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:

• 486, Pentium, and PowerPC microprocessors

• 3.5-inch floppy disc drive

• Keyboard

• Monitor/display

• Printer

• External modem

• Mouse

Although the test system with this Seagate m odel com plies to the directives/standard(s), we cannot guarantee that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance and provide CE Marking and C-Tick Marking for their product.

Electromagnetic compliance for the European Union

If this model has the CE Marking it complies with the European Union requirements of the Electrom agnetic Compatibility Directive 89/336/EEC of 03 May 1989 as am ended by Directive 92/31/EEC of 28 A pri l 19 92 and Directive 93/68/EEC of 22 July 1993.

4 Cheetah 18LP Product Manual, Rev. F

Australian C-Ti ck

If this model has the C-Tick Marking it complies with the Au stralia/New Zealand Standard AS/NZS3548 1995 and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Management Agency (SMA).

2.3 Reference documents

Cheetah 18LP Installation Guide Seagate P/N 83329410 SCSI Interface Product Manual Seagate P/N 77738479 SCSI Interface Product Manual (Ultra160 and later) Seagate P/N 75789509

ANSI small computer system interface (SCSI) document numbers:

X3.131-1994 SCSI-2 X3.253-1995 SCSI-3 Parallel Interface

T10/1142D Rev. 14 SPI-2 (SCSI-3 Parallel Interface version 2) SFF-8046 Specification for 80-pin connector for SCSI disk drives 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.

Cheetah 1 8LP Product Manual, Re v. F 5

3.0 General description

Cheetah 18LP drives combine dual stripe magnetoresistive (DSMR) heads, partial response/max imum likelihood (PRML) read channel electronics, embedded servo technology, and a wide Ultra2 (Ultra160 on ST318233 and ST39133 mode ls) SCSI interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.

The SCSI interface uses negotiated transfer rates. These transfer rates will occur only if your host adapter supports these da ta transfer rates and is compatible with the required hardware requ irements of the I/O circuit type. This drive also operates at SCSI-1 and SCSI-2 data transfer rates for backward compatibility with nonUltra/Ultra2/Ultra160 SCSI host adapters.

Table 1 lists the features that differentiate the two Cheetah 18LP models.

Table 1: Drive model number vs. differentiating features

Number

Model number

of active heads I/O circuit type [1]

Numbe r o f I/O connector pins

Number of I/O data bus bit s SCSI interface

ST318203LW/LWV ST39103LW/LWV126

Single-ended (SE) and low voltage

68 16 Ultra2

differential (LVD)

ST318203LC/LCV ST39103LC/LCV

12 6

Single-ended (SE) and low voltage

80 16 Ultra2

differential (LVD)

ST318233LWV ST39133LWV

12 6

Single-ended (SE) and low voltage

68 16 Ultra160

differential (LVD)

ST318233LCV ST39133LCV

12 6

Single-ended (SE) and low voltage

80 16 Ultra160

differential (LVD)

[1] See Section 9.6 for details and definitions. The drive records and recovers data on approxim ately 3.3-inc h (84 mm) non-removable discs. ST318203 and ST39103 model drives suppor t the Small Computer System Interface (SCSI) as described in

the ANSI SCSI interface specifications to the extent described in this manual, which defines the product performance characteristics of these drives, and the SC SI Interface Product Manual, part numb er 77738479, wh ich describes the general interface characteristics of these drives.

ST318233 and ST39133 model drives suppor t the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface specifications to the extent described in this manual, which defines the product performance characteristics of these drives, and the SC SI Interface Product Manual, part numb er 75789509, wh ich describes the general interface characteristics of these drives.

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—never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.

Cheetah 18LP drives use a dedicated landing zone at the innermost radius of the media to eliminate the possibility of destroying or degrading data by landing i n the data zone. The d rive automatically go es to t he landing zone when power is removed.

6 Cheetah 18LP Product Manual, Rev. F

An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling. The sh ipping lock autom atically diseng ages when power is applied t o the drive and the head load process begins.

Cheetah 18LP drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments and related reliability concerns.

A high-performance actuator ass embly with a low-inertia, balanced, patented, straight-arm design provides excellent performance with minimal power dissipation.

Figure 2.

Cheetah 18LP

family drive

Cheetah 1 8LP Product Manual, Re v. F 7

3.1 Standard features

The Cheetah 18LP family has the following standard features:

• Integrated Ultra/Ultra2 SCSI controller (ST318203 and ST39103 models)

• Integrated Ultra160 SCSI controller (ST318233 and ST39133 models)

• Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD )

• 16 bit I/O data bus

• Asynchronous and synchronous data transfer protocol

• Firmware downloadable via SCSI interface

• Selectable even by te secto r sizes from 512 to 4,096 bytes/sector

• 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 185 bits

• Sealed head and disc assembly

• No preventative maintenance or adjustment required

• Dedicated head landing zone

• Embedded servo design

• 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

• 1,024 kbyte data buffer (4 , 096 kbytes on LWV/LCV models)

• Hot plug compatibility (Section 9.6.4.2 lists proper host connector needed) for “LC” and “LCV” model drives

• SCAM (SCSI Configured Automatically) plug-n-play level 2 compliant, factory set to level 1

3.2 Media characteristics

The media used on the drive has a diameter of approximately 3.3 inches (84 mm). The aluminum substrate is coated with a thin film magnet ic materi al, overcoated with a proprie tary prot ective layer for improved dura bilit y and environmental protection.

3.3 Performance

• Supports industry standard Ultra2 SCSI interface (ST318203 and ST39103 models)

• Supports industry standard Ultra160 SCSI interface (ST318233 and ST39133 models)

• Programmable multi-segmentable cache buffer (see Section 3.1)

• 10,016 RPM spindle. Average latency = 2.99 ms

• Command queuing of up to 64 commands

• Background processing of queue

• Supports start and stop commands (spindle stops spinning)

3.4 Reliability

• 1,000,000 hour MTBF

• LSI circuitry

• Balanced low mass rotary voice coil actuator

• Incorporates industr y-standa rd Self-Monitori ng, Analysis and Reporting Technol ogy (S.M.A.R.T.)

• 5-year warranty

8 Cheetah 18LP Product Manual, Rev. F

3.5 Unformatted a n d 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 standard OEM model capacities:

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

ST318203 and ST318233 21EB390h (18.20 GB) [2] 21.6 GB ST39103 and ST39133 10F59C8h (9.10 GB) [2] 10. 8 GB

Notes.

[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block

size before issuing a format command and obtain di fferent formatted capacities t han those listed. See Mode Select Command and Format Command in the appropriate SCSI Interface Product Manual.

[2] User available capacity depends on spare reallocation scheme selected, the number of data tracks per

sparing zone, and the number of alternate sectors (LBAs) per sparing zone.

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 appropriate SCSI Interface Product Manual. Refer to the Parameter li st block descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not change the c apacity it is currently format ted to have. A number in the number o f blocks field that is less than the max imum number of LB As changes th e total drive capacity to the value in the block descr iptor number of blocks field. A value greater than the m aximum number of LB As is rou nded down to the maximum capacity.

3.7 Factory installed accessories

OEM Standard drives are shipped with the Cheetah 18LP Installation Guid e, part number 83329410 (unless otherwise specified). The factory also ships with the drive a small bag of jumper plug s used for the J2, J5, and J6 option select jumper headers.

3.8 Optio ns (factory insta lled)

All customer requested options are in corporated duri ng production or packaged at t he manufacturing 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 secto r size requested.

• Single unit shipping pack. T he drive is nor mally shipped in bulk packaging to provide max imum protection

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 Cheetah 18LP Installation Gu ide, par t number 8332941 0, is usually include d with each standard OEM

drive shipped, but extra copies may be ordered.

3.9 Accessories (user installed)

The following accessories are available. All accessories may be installed in the field.

• Single unit shipping pack.

Cheetah 1 8LP Product Manual, Re v. F 9

4.0 Performance characteristics

4.1 Internal drive characteristics (transparent to user)

ST318203 ST39103 ST318233 ST39133

Drive capacity 18.2 9.10 18.2 9.10 GByte (formatted, rounded) Read/write heads 12 6 12 6 Bytes/track 153,284–

229,045 Bytes/surface 1,913 1,913 1,913 1,913 Mbytes (unformatted, rounded) Tracks/surface (total) 9,801 9,801 9,801 9,801 Tracks (user accessible) Tracks/inch 12,580 12,580 12,580 12,580 TPI Peak bits/inch 2 52 252 252 252 K BPI Internal data rate 193-308 193–308 193-308 193–308 Mbits/sec (variable with zone) Disc rotational speed 10,016 10,016 10,016 10,016 r/min (+ Average rotational latency 2.99 2.99 2.99 2.99 msec

4.2 SCSI performance characteristics (visible to user)

The values given in Section 4.2.1 apply to all models of the Cheetah 18LP family unless otherwise specified. Refer to Section 9.10 and to the appropriate SCSI Interface Product Manual, for additional timing details.

153,284– 229,045

Bytes (average, rounded)

0.5%)

4.2.1 Access time [5]

Including cont roller overhead (without disconnect) [1] [3]

Drive level Drive level

Not including controller overhead (without disconnect) [1] [3]

Read Write R ead Write

msec msec Average – Typical [2] 5.4 6.0 5.2 5.8 Single Track – Typical [2] 0.7 0.9 0.5 0.7 Full Stroke – Typical [2] 12.2 13.2 12.0 13.0

4.2.2 Format command execution time (minutes) [1]

ST318203/ST318233 ST39103/ST39133

Maximum (with verify) 60 60 Maximum (no verify) 30 30

4.2.3 Generalized performance chara cteris tics

Minimum sector interleave 1 to 1

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

Min. [3] 22.7 MByte/sec Avg. [3] 29.5 MB yte/ s ec Max. [3] 36.2 MByte/sec

SCSI interface data transfer rate (asynchronous):

Maximum instantaneous one byte wide 5.0 Mbytes/sec [4] Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]

Synchronous transfer rate for SCSI Fast-40, Ultra2 SCSI (ST318203 and ST39103 models):

In single-ended (SE) interface mode 5.0 to 40 Mbytes/sec In low voltage differential (LVD) interface mode 5.0 to 80 Mbytes/sec

10 Cheetah 18LP Product Manual, Rev. F

Synchronous transfer rate for Ultra160 SCSI (ST318233 and ST39133 models):

In single-ended (SE) interface mode 5.0 to 40 Mbytes/sec In low voltage differential (LVD) interface mode 5.0 to 160 Mbytes/sec

Sector Sizes:

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

If n (number of bytes per sector) is odd, then n-1 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 zone reallocation scheme.) Average rotational latency 2.99 msec

Notes for Section 4.2.

[1] Execution time measured from receipt of t he last byte of the Command Descrip tor Block (CDB) to the

request for a Status Byte Transf er to the Initiator (excluding connect/disconnect).

[2] Typical access times are m easured und er nominal conditions of temperature, voltage, and horizontal ori-

entation as measured on a representative sample of drives. [3] Assumes no errors and no sector has been relocated. [4] Assumes system ability to support the rates listed and no cable loss. [5] Access time = controller overhead + average seek time.

Access to data = controller overhead + average seek time + latency time.

4.3 S tar t/stop ti me

After DC power at nominal voltage has been applied, the drive becomes ready within 30 seconds if the Motor Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error condition is detected during the star t sequence, the drive executes a recovery procedu re which may cause the time to become ready to exceed 30 sec onds. During spin up to read y time the drive responds to some c ommands over the SCSI interface in less than 3 seconds after application of power. Stop time is less than 30 seconds from removal of DC power.

If the Motor Start Option is enabled, the inter nal controller accept s the commands listed in the S CSI Interface Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has been received the drive becomes ready for normal operations within 30 seconds typically (excluding an error recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle (see the appropriate SCSI Interface Product Manual).

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 b uffer storage space when it is used in cache operations. To select prefetch and cache features the host sends the Mode Select command with the proper values in the applicable bytes in Mode Page 08h (see the appropr iate SCS I Interface Product Manual). Prefetch and cache ope ration are independe nt features from the standpoin t that each is enabled and disabled independently via the Mode S el ect com m and. 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 parameter values (Mode Page 08h) for standard OEM versions of this drive family are given in Tables 9.

4.5 Cache operation

In general, 840 Kbytes (3,600 kbytes of the 4,096 kbytes on LWV and LCV units) of the physical buffer space in the drive can be used as storage space for cache operations. The buffer c an be divided into logical segments (Mode Select Page 08h, byte 13) from which data is read and to which data is written. The drive maintains a

Cheetah 1 8LP Product Manual, Re v. F 11

table of logical block disk medium addresses of the data stored in each segmen t of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See the appropriate SCSI Interface Product Man- ual), data requested by the host with a Read 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 segment s during disc medium read operations (disregarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the requested read data, but goes directly to the medium to retrieve it. The retrieved dat a merel y 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 bufferfull ratio rules. On a cache hit the drive ignores the buffer-full ratio rules. See explanations assoc iated with Mode page 02h (disconnect/reconnect control) in the appropriate SCSI Interface Product Manual.

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

Case A -

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

1. Drive transfers to the initiator the first LB requested plus all subsequent contiguous LBs that are alre ady in the cache. This data may be in multiple segments.

2. When the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining requested LBs from the disc and puts them in a segment of the cache. The drive transfers the remaining requested LBs from t he cac he to the host in acco rdance with the disconnect/reconnec t sp ecification mentioned above.

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

Case B -

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

1. The drive fetches the requested LBs from the disc and transf ers t hem into a segment, and from there to the host in accordance with the disconnect/reconnect specification referred to in case A.

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

Each buffer segment is actually a self-contained circular storage (wrap-around occurs), 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 overall performance as a cache storage, allowing a wide range of user selectable config- urations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled (see Section 4.5.2). The number of segm ents may be selected using the Mode Select comm and, but the size can not be directly selected. Size is selected only as a by-product of selecting the segment number specification. 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 by the host in a Mode Select command

(bytes 14 and 15) no new segment size is set up by the drive, and if the STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see the appropriate SCSI Interface Product Manual). The dri ve supports operation of any integer number o f segm ent s from 1 to 16. Default is three segments.

4.5.1 Caching write data

Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to be written to the medium is stored in one or more segments while the drive performs the write command.

If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made available for future read cache hi ts. The sam e buffer space and segmentation is us ed as set up for read f unct ions. The buffer se gmentation scheme is set up or changed independently, hav ing 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 cache from a previous read or write command. If there are, the respective cache segments are cleared. The new data is cached for subsequent Read commands.

If the number of write data logi cal blocks exceeds the size of the segment bei ng written into, when the end of 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 t he drive may return GOOD status on a wri te command after the data has been transferred into the cache, but before the data has been written to the medium. If an error occurs

12 Cheetah 18LP Product Manual, Rev. F

while writing the dat a to the medium, and G OOD status has already been returned, a deferred error will be generated.

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.

Tables 9 show Mode default settings for the drives.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in con tig uous l ogical blocks on the disc immediately beyond that wh ich was requested by a Read command can be retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read commands that request thos e logical blocks (this is tr ue even if cache operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in the buffer is a prefetch hit, not a cache operation hit. Prefetch is enabled using Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched replaces data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize system performance. The max prefetch field (bytes 8 and 9) limits the amount of prefetch. The drive does not use the Prefetch Ceiling field (bytes 10 and 11).

During a prefetch operation, the drive crosses a cylinder boundar y t o fetch more data only if the Discontinuity (DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

Whenever prefet ch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA (Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous blocks from the disc when it se nses that a prefetch hit will likely oc cur, even if two consecutive read operations were not for physically contiguous blocks of data (e.g., “software interleave”). ARLA disables prefetch when it decides that a prefetch hit will n ot likely oc cur. If the host is not using s oftware inter leave, and if two sequentia l read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read operations request contiguous blocks of data, ARLA keeps prefetch enabled.

Cheetah 1 8LP Product Manual, Re v. F 13

5.0 Reliability specifications

The following reliability specifications assume correct host/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 1,000,000 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 command.

• Errors caused by media defects or host system failures are excluded from error rate computations. Refer to Section 3.2, “Media Characteristics.”

• Assume random data.

seeks

bits transferred (OEM default settings)

bits transferred

5.1.1 Environmental interference

When evaluating syste ms operation under conditions of Electromagnetic Interference (EMI), the perfor mance of the drive within the system shall be c onsidered acc eptable if the drive does not generate an unrecoverable 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 drive or system recovery procedures without operator interven-

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 v erifi ed as being written correctly on the m edia.

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

5.1.3 Write errors

Write errors can occur a s 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 because of an equipment malfunction in the drive, the error is classified 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 (exc luding media defects).

5.1.4 Seek errors

A seek error is defined as a failure of the dr ive to posi tion the heads to the addressed track. There shal l be no more than ten recoverable seek errors in 10

physical seek operations. After detecting an initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning error (15h) is reported with a Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an

14 Cheetah 18LP Product Manual, Rev. F

unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to the appropriate SCSI Interface Product Manual, for Request Sense information.

5.2 Reliability and service

You can enhance the reliability of Cheetah 18LP disc drives by ensuring that the drive receives adequate cooling. Section 6.0 provides temperatu re measurem ents and other i nformation that m ay be used to enha nce the service life of the drive. Section 8.3.1 prov id es recomm ended air-flow information.

5.2.1 Mean time between failure

The production disc dri ve shall achieve an MTBF of 1,000,000 hours w hen operated in an environment that ensures the case temperatures specified in Section 6.4.1, T able 3 are not exceeded. Short-term excursions up to the specification l imits of the operating environment will not affect MTBF performance. Continual or sustained operation at case temperatures above the values shown in Table 3 may degrade product reliability.

The MTBF target is specified as device power-on hours (POH) for all drives in se rvice per failure.

Estimated power-on operating hours in the period

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 service. Each disc drive shall have accumulated at least nine months of operation. Data shall be calculated on a rolling average base for a minimum period of six months.

MTBF is based on the following assumptions:

• 8,760 power-on hours per year.

• 250 average on/off cycles per year.

• Operations at nominal voltages.

• Systems will provide adequate cooling to ensure the case tempe ratures specified in Section 6.4.1 are not

exceeded. Drive failure means any stoppage or failure to meet defined specifications caused by drive malfunction. A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered

an MTBF hit.

5.2.2 Field failure rate vs time

The expected field failure rate is listed below. Drive utilization will vary. An estimated range of utilization is:

• 720 power-on hours (POH) per month.

• 250 on/off cycles per year.

• Read/seek/write operation 20% of power-on hours.

• Systems will provide adequate cooling to ensure the case tempe ratures specified in Section 6.4.1 are not

exceeded.

Month 1 2,364 PPM Month 2 1,422 PPM Month 3 1,403 PPM Month 4 1,391 PPM Month 5 1,317 PPM Month 6 1,255 PPM Month 7 1,162 PPM Month 8+ 1,025 PPM

Failure rate is calculated as follows:

• No system-induced failures are counted

• Based on 1,000,000 MTBF and 720 power-on hours per month

• Month 1’s rate includes a 300 PPM installation fai lure

Cheetah 1 8LP Product Manual, Re v. F 15

5.2.3 Preventive maintenance

No routine scheduled preventiv e maintenance shall be required.

5.2.4 Service life

The drive shall have a usef ul service life of five years. Depot repair or replacement of major parts is permitted during the lifetime (see Section 5.2.5).

5.2.5 Servi c e philosophy

Special equipment is required to repair the drive HDA. In order to achieve the above service life, repairs must be performed only at a proper ly equipped and st affed service and r epair facility. Troubleshooting and repair of PCBs in the field is not rec ommended, because of the extensive diagnostic equi pment required for effective servicing. Also, there are no spare parts available for this drive. Drive warranty is voided if the HDA is opened.

5.2.6 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.5. 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.

5.2.7 Hot plugging Chee ta h 1 8LP di s c dri v es

The ANSI SPI-2 (T10/1142D) docum ent defines the physical requirements for removal and insertion of SCSI 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 Cheetah 18LP disc d rives support all four hot plugging cases. Provision shall be made by the system such that a device being inserted m akes power and ground connections prior to the conne ction of any device signal contact to the bus. A device being removed shall maintain power and ground connections after the disconnection 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 processes for the SCSI device being insert ed or removed shall be quiescent. All SCS I devices on the bus shall have receivers that conform to the SPI-2 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 processes for all devices on the bus must be completed, 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 Re set, 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 (HVD) drivers and receivers and devices with SE, LVD, or multimode drivers and receivers on the same SCSI bus since the common mode voltages in the HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-2).

The disc drive spindle must come to a complete stop prior to completely rem oving the drive from the cabinet chassis. Use of the Stop Spindle command or partial withdrawal of the drive, enough to be disconnected from 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, "Shock and vibration" in this manual.

16 Cheetah 18LP Product Manual, Rev. F

5.2.8 S.M.A.R.T.

S.M.A.R.T. is an acronym for Self-Monitoring Anal ysis and Re port ing Techn ology. This technology is intended to recognize conditions that indicate a drive failure and is designed to provide sufficient warning of a failure to allow data back-up before a n actual failure occurs.

Note.

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

Each attribute has been selecte d to m onitor a s pecific s et of failure conditions in th e operating pe rformanc e of the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.

Controllin g S.M.A.R.T.

The operating mode of S.M.A.R.T. is co ntrol led by t he DEXCPT bit and the PERF bit of the “Informational Exceptions Control Mode Page” (1Ch). The DEXCPT bit is used to enable or di sable 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 normal read/write operations. When the PERF bit is set, the drive is considered to be in “On-line Mode Only” and will not perform off-line functions.

The process of measuring of f-line attributes and saving data can be forced by the RTZ command. Forcing S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.

The drive can be interrogated by the host to determine the time remaining before the next scheduled measurement and data logging process will occur. 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 Rezero Unit 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 s ave parameters once every two hours subject t o an idle period on the SCSI bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable and the maximum delay is summarized below:

Maximum processing delay

On-li ne o nly de l ay Fully enabled de lay DEXCPT = 0, PERF = 1 DEXCPT = 0, PERF = 0

S.M.A.R.T. delay times 50 milliseconds 300 milliseconds

Repor tin g c on t rol

Reporting is controlled in the Informational Exce ptions Control Page (1Ch). Sub ject to the repor ting method, the firmware will issue a 01-5D00 sens e code t o the host. The error code is preser ved through bus resets and power cycles.

Determining rate

S.M.A.R.T. monitors the rate at which errors occur an d sig nals a predictive failure if the rate of degraded error rate increases to an unacceptable level. To determine rate, error events are logged and com pared to the num ber of total operations for a gi ven attribute. The interval defines the number of operations over which to measure the rate. The counter that keeps track of the current number of operations is referred to as the Interval Counter.

S.M.A.R.T. measures error rate, hence for each attribute the occurrence 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 operation. The algorithm that S.M.A.R.T. uses t o record rates of error is to set thresholds for t he number of errors and the interval. If t he number of errors exceeds the threshold before the interval expires, then the error rate is considered to be unacceptable. If the number of errors does 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 star ts over.

Cheetah 1 8LP Product Manual, Re v. F 17

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of tim e. The fir m ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accomplish this, a counter is incremented whenever the error rate is unacceptable and decremented (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.

5.2.9 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 materials on workmanship or due to nonconformance to the applicable specifications will be repaired or replaced, at Seagate ’s option and at no charge to customer, if returned by customer at customer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty procedure. Seagate will pay for transporting the rep air or replacement item to customer. For more detailed warranty information refer to the Standard terms and condition s of Purchase for Seagate products.

Shipping

When transpor ting or shipping a drive, a Seagate approved containe r must be used. Keep your original box. They are easily identified by the Seagate-approved package label. Shipping a drive in a non-approved c ontainer voids the drive warranty .

Seagate repair centers may refuse recei pt of compon ent s im properly packaged or obviously damage d in transit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends s hipping by an air-ride carrier experienced in handling computer equipment.

Product repair and re turn information

Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory-seal voids the warranty.

18 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 19

6.0 Physical/electrical specifications

This section provides information relating to th e physical and electrical characteristics of the Cheetah 18LP drive.

6.1 AC power requirem ents

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 table shows current values in Amperes.

T able 2: DC power requirements

Notes

SE mode LVD mode SE mode LVD mode

ST318203 ST39103

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

[1][7] 0.69 0.6 0.71 0.6 0.71 0.34 0.72 0.34

Maximum starting current

(peak DC) DC (peak AC) AC

[3] [3]

0.79

1.0

1.53

2.4

0.81

1.03

1.53

2.4

0.81

0.94

1.4

2.2

0.82

0.95

1.4

2.2 Delayed motor start (max) DC [1][4] 0.61 0 .02 0.62 0.02 0.62 0.02 0.65 0.02 Peak operating current

DCX Maximum DC Maximum (peak) DC

[1][6] [1]

0.76

0.79

1.05

1.03

1.13

2.66

SE mode LVD mode SE mode LVD mode

0.82

0.84

1.27

ST318233 ST39133

1.03

1.13

2.66

0.79

0.80

1.06

0.81

0.84

2.2

0.84

0.85

1.27

0.81

0.84

2.2

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

[1][7] 0.8 0.65 0.88 0.65 0.8 0.45 0. 88 0.45

Maximum starting current

(peak DC) DC (peak AC) AC

[3] [3]

0.82

1.1

1.61

3.1

0.90

1.13

1.61

3.1

0.81

1.1

1.71

3.1

0.89

1.12

1.71

3.1 Delayed motor start (max) DC [1][4] 0.67 0.04 0.76 0.04 0. 67 0.04 0.76 0.04 Peak operating current

DCX Maximum DC Maximum (peak) DC

[1][6] [1]

0.82

0.83

0.91

1.09

1.13

2.4

0.92

0.93

1.18

1.09

1.13

2.4

0.82

0.83

0.95

0.88

0.98

2.24

0.92

0.93

1.19

0.88

0.98

2.24

[1] Measured with average reading DC ammeter or equivalent sampl ing scop e. Instantaneo us c urrent peak s

will exceed these values. Power supply at nominal voltage. N = 6, 22 Degrees C ambient.

[2] For +12 V, a –10% tolerance is perm issible during initial start o f spindle, and must return to ±5% before

10,000 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence

has been completed and that the drive is able to accept selection by the host initiator. [3] See +12 V current profile in Figure 3. [4] This condition occurs when the Motor Star t Option is enabled and the drive has not yet received a Start

Motor co mm a n d. [5] See Section 6.2.1 “Conducte d Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,

and transient response.

20 Cheetah 18LP Product Manual, Rev. F

[6] Operating condition is defined as random 8 block reads at 200 I/Os per second for ST318203 drive, 203 I/

Os per second for ST39103 drives, and 197 I/Os per second for ST318233 and ST39133 drives. Current and power specified at nominal voltages. ST318203 and ST39103: Increasin g +5 volts by +5% increas es 5 volt current by < 0.5%. ST318233 and ST39133: Decreasing +5 volts by +5% increases 5 volt current by

2.7%. All Cheetah 18LP models: Decreasing +12 volt supply by 5% increases 12 volt current by 1.4%.

[7] During idle, the drive heads are re located every 60 seconds to a random loca tion within the band from

track zero to one-fourth of maximum track.

General Notes for Table 2:

1. Minimum current loading for each supp ly voltage is not le ss than 1. 9% of the m aximum 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.

4. Parameters, other than spindle start, are measured after a 10-minute warm up.

5. No ter m inator power.

6.2.1 Conducted noise immunity

Noise is specified as a per iodic and random distri bution of frequencies 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 = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

+12 V = 150 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 req uire power sequenc ing. The d rive protects against inadvertent writing d uring power-up and down. Daisy-chain operation requires that power be maintained on the SC SI bus terminator to ensure proper termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI ID) enable the Delay Motor Start option and disable the Enable Motor Start option on the J2 connector. See Section 8.1 for pin selection information. To delay the motor until the drive receives a Star t Unit command, enable the Enable Remote Motor Start option on the J2 connector.

6.2.3 12 V - Current profile

Figures 3 and 4 identify t h e drive +12 V current profiles of drives doc um ente d in this m anual. The current during the various times is as shown:

T0 - Power is applied to the drive. T1 - Controller self tests are pe rformed. T2 - Spi ndle begins to accelerate under current limiting after performing drive internal

diagnostics. See Note 1 of T able 2. T3 - The spindle is up to speed and the head-arm restraint is unlocked. T4 - The adaptive servo calibration sequence is performed. T5 - Ca libration is complete and drive is ready for reading and writing.

Note.

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

Cheetah 1 8LP Product Manual, Re v. F 21

+12 Volt Current during spindle start – Typical Amperes

2.5 AC Envelope

2.0

1.5

1.0

0.5

0.0

T0 T1 T3 T4

DC (average) of waveform

0.0 2 4 6 8 10 12 14 16

Seconds

Figure 3. Typical ST318203 and ST318233 drive +12 V curr ent profile

+12 Volt Current during spindle start – Typical Amperes

2.5 Peak AC Envelope

2.0

Peak DC

1.5

1.0

0.5

T0 T1 T3 T4

0.0 2 4 6 8 10 12 14 16

Seconds

Figure 4. T ypical ST39103 and ST39133 drive +12 V current profile

22 Cheetah 18LP Product Manual, Rev. F

+5 Volt Current during spindle start – Typical Amperes

+5V

Current

(amps)

1.0

0.5

Nominal (average) DC curve

T3 T5

Component

0.0 4 8 12 16 20 24 28 32

Seconds

Figure 5. Typical ST318203 and ST318233 drive +5 V current profile

+5 Volt Current during spindle start – Typical Amperes

+5V

Current

(amps)

1.0 A

0.5

Component

Nominal (average) DC curve

T1T0 T3 T5

0.0 2 4 6 8 10 12 14 16

Seconds

Figure 6. Typical ST39103 and ST39133 drive +5 V curr ent profile

Cheetah 1 8LP Product Manual, Re v. F 23

6.3 Power dissipation ST318203

For drives using single-ended interface circuits, typical power dissipation under idle conditions i s 10.65 watts (36.3 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is

10.75 watts (36.7 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curves. Locate the

typical I/O rate for a drive in y our system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

1.8 5V A

1.6

1.4

12V A Watts

1.2

Amperes

0.8

0.6

0.4

0 50 100

I/Os per Second

150 200 250

Figure 7. ST318203 DC current and power vs. input /output operations per second (SE)

1.8

1.6

1.4

1.2

Watts

5V A 12V A Watts

Amperes

0.8

0.6

0.4 0 50 100

150 200 250

I/Os per Second

Figure 8. ST318203 DC current and power vs. input /output operations per second (LVD)

Watts

24 Cheetah 18LP Product Manual, Rev. F

ST39103

For drives using single-ended interface circuits, t ypical power di ssipation under idle conditions is 7.63 watts (26 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 7.68 watts (26.2 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 9 and 10). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

1.600

1.400

1.200

5V A 12V A Watts

1.000

0.800

Amperes

0.600

0.400

0.200 0 50 100

I/Os per Second

Figure 9. ST39103 DC current and power vs. input/output operations per second (SE)

150 200 250

1.600

1.400

1.200

1.000

Watts

5V A 12V A Watts

0.800

Amperes

0.600

0.400

0.200 0 50 100

150 200 250

I/Os per Second

Figure 10. ST39103 DC current and power vs. input /output operations per second (LVD)

Watts

Cheetah 1 8LP Product Manual, Re v. F 25

ST318233

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 11.8 watts (40.27 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 12.2 watts (41.63 BTUs per hour).

To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 7 and 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123.

1.6

1.4

5V A

12V A Watts

1.2

1.0

0.8

Amperes

0.6

0.4

0.2 0 50 100

I/Os per Second

Figure 11. ST318233 DC current and power vs. input/output operations per second (SE)

1.6

1.4

1.2

150 200 250

Watts

5V A 12V A Watts

1.0

0.8

Amperes

0.6

0.4

0.2 0 50 100

I/Os per Second

Figure 12. ST318233 DC current and power vs. input/output operations per second (LVD)

150 200 250

Watts

26 Cheetah 18LP Product Manual, Rev. F

ST39133

For drives using single-ended interface circuits, typical power dissipation under idle c ondi tions is 9.4 watts (32 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 9.8 watts (33.4 BTUs per hour).

1.6

1.4

5V A

12V A Watts

1.2

1.0

0.8

Amperes

0.6

0.4

0.2 0 50 100

I/Os per Second

Figure 13. ST39133 DC current and power vs. input /output operations per second (SE)

1.6

1.4

1.2

150 200 250

Watts

5V A 12V A Watts

1.0

0.8

Amperes

0.6

0.4

0.2 0 50 100

I/Os per Second

Figure 14. ST39133 DC current and power vs. input /output operations per second (LVD)

150 200 250

Watts

Cheetah 1 8LP Product Manual, Re v. F 27

6.4 Environment al limits

Temperature and humi dity values experienced by the drive must be s uch th at con densat ion do es not oc cur on any drive part. Altitude and atmospheric pressu re specifications are referenced to a standard 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 main tain the case temperatures of Table 3 (ST318203 and ST39103 models) or Table 4 (ST318233 and ST39133 models), the drive meets all specifications over a 41°F to 122°F ( 5°C to 50°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C) per hour. The enclosure for the drive should be designed such that the temperatures at the locations specified in Table 3 (ST318203 and ST 39103 models) or Table 4 (ST31823 3 an d S T3 9133 models) are not exceeded. A ir flow may be needed to achieve these temperature values (see Section 8.3 and 8.3.1). Operation at case temperatures above these values may adversely affect the drives ability to meet specifications.

The MTBF specification for the drive is based on operating in an environment that ensures that the case temperatures specified in Table 3 (ST318203 and ST39103 models) or Table 4 (ST318233 and ST39133 models) are not exceeded. Occasional excursions to drive ambient temperatures of 122°F (50°C) or 41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these temperatures (see Section 8.3.1). Continual or sustained operation at case temperatures above these values may degrade MTBF.

To confir m that the requi re d cooling for the electronics and HDA is provided, place the dr ive in its final mechanical configuration, perform random write/read operat ions. After the temperatures stabilize, measure the case temperature of the comp onents listed in Table 3 (ST31 8203 and ST39103 models) or Table 4 (ST318233 and ST39133 models). See note [2].

The maximum allowable HDA case temperature is 60°C. 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 and HDA temperatures (ST318203 and ST39103 models)

Items in Figure 15

Maximum allo wa ble case temperature (

C) operating

Maximum allowable case [3] temperatures (°C) to meet MTBF spec.

HDA [2] 60 45 1 80 60 268 48 376 56 471 51

Table 4: PCBA and HDA temperatures (ST318233 and ST39133 models)

Items in Figure 15

Maximum allo wa ble case temperature (

C) operating

Maximum allowable case [3] temperatures (°C) to meet MTBF spec.

HDA [2] 60 45 1 80 60 273 53 381 61 471 51

Notes.

[1] Section 8.3.1 de scribes the air-flow patter ns used when generating the 1 milli on hours MTB F guide-

lines in column 2. Air flow was opposite that s hown in Sect ion 8 .3.1. Loc al air velocity was 0.92 m/sec (180 lfpm). Inlet air temperature to the dr ive was 77 °F (25°C), plus 9°F (5°C) temperature rise in the

test enclosure (86°F/30°C ambient local to the drive). [2] Measure HDA temp at point labeled “HDA” on Figure 15. [3] PCB mounted integrated circuit case.

28 Cheetah 18LP Product Manual, Rev. F

b. Non-operating

–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This specification assumes that the drive is packaged in the shipping container designed by Seagate for use with drive.

HDA Temp.

Check Point

Model “LC” PCBA

U11

U18

U14

U12

J1A

U20

1.0"

.5"

Model “LW” PCBA

U11

U18

U14

U12

U20

Figure 15. Locations of PCBA components listed in Tables 3 and 4

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 (–305 to +3,048 meters)

b. Non-operating

–1,000 to +40,000 feet (–305 to +12,210 meters)

Cheetah 1 8LP Product Manual, Re v. F 29

6.4.4 Shock and vibration

Shock and vibration limits specified in th is docum ent are measured directly on t he drive chassis. If the drive is installed in an enclosure to which the stated shock and/or vibration criteria is app lied, resonances 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 shock and vibration defined within this document are specified with the drive mounted by any of the four methods shown in Figure 16, and in acc ordance with t he res trict ions of S ecti on 8.4. Orientation 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 5.0 Gs at a m aximum duration of 11 msec (h alf sinewave). Shock may be applied in the X, Y, or Z axis.

b. Operating—abnormal

Equipment, as installed for nor mal operation, does not incur physical damage while subject ed to intermittent shock not exceeding 10 Gs at a maxim um duration of 11 msec (half sinewave). Shock occurring at abnormal levels may promote degraded operational perfo rmance during the abnor m al 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 shall apply to all conditions of handling and transportation. This includes both isolated drives and integrated drives.

The drive subjected to nonrepetitive shock not exceeding 75 Gs at a maximum duration of 11 msec (half sinewave) shall not exhibit device damage or performance d egradation. Shock may be applied in the X, Y, or Z axis.

The ST318203LW/LWV/LC/LCV and ST318233LWV/LCV drive subjected to nonrepetitive shock not exceeding 200 Gs at a maximum duration of 2 msec (half sinewave) does not exhibit de vice damage or performance degradation. The ST39103LW/LWV/ LC/LCV and ST39133LWV/LCV drive subjected to nonrepetitive shock not exceeding 230 Gs at a maximum duration of 2 m sec (half sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y , or Z axis.

The drive subjected to nonre petitve shock not exceeding 100 Gs a t a maximum duration of 0.5 msec (half sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y, or Z axis.

d. Packaged

Disc drives shipped as loose load (not palletized) general freight will be package d to withstand d rops 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).

Pack age 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)

Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 k g) or less by Seagate for general freight shipment shall withstand a drop test from 48 i nches (1,070 mm ) against a concrete floor or equivalent.

30 Cheetah 18LP Product Manual, Rev. F

Y X

Figure 16. Recommended mounting

Cheetah 1 8LP Product Manual, Re v. F 31

6.4.4.2 Vibration

a. Operating - normal

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

5-400 Hz @ 0.5 G

Vibration may be applied in the X, Y, or Z axis.

b. Operating - abnormal

Equipment as install ed for normal operation shall n ot incur physical damage while subjec ted to periodic vibration not exceeding:

15 minutes of duration at major resonant frequency 5-400 Hz @ 0.75 G (X, Y, or Z axis)

Vibration occurring at these levels may degrade operational performance during the abnormal vibration period. Specified operational performance will continue when normal operating vibration levels are resumed. This assumes system recovery routines are ava ila ble.

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 damage or degraded performance as a result of continuous vibration not exceeding

5-22 Hz @ 0.080 inches (2.03 mm) displacement 22-400 Hz @ 2.00 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 4.3 bels typical when measured to ISO 7779 specification. There will not be any disc rete tones more than 10 dB above the masking noise on typical drives when m ea-

sured according to Seagate specificat ion 30553-0 01. There wil l not be a ny tones mo re than 24 dB above the mas king noise on any drive.

6.4.7 Electromagnetic susceptibility

See Section 2.1.2.

32 Cheetah 18LP Product Manual, Rev. F

6.5 Mechanical specifications

The following nominal dimensions are ex clusive of the decorative front panel accessory. However, dimensions of the front panel are shown in figure below. Refer to Figures 17 and 18 for detailed 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 146.05 mm Weight: 1.3 pounds (ST318203 and ST318233)

1.2 pounds (ST39103 and ST39133)

-Z-

-Z-T//

[1]

Notes:

[1]

0.589 kilograms

0.544 kilograms

-Z-

Mounting holes are 6-32 UNC 2B, three on each side and four on the bottom. Max screw penetration into side of drive is 0.15 in. (3.81 mm). Max screw tightening torque is 6.0 in-lb (3.32 nm) with minimum full thread engagement of

0.12 in. (3.05 mm).

-X-U

[1]

-X-

Figure 17. LW and LWV mounting configuration dimensions

1.028

5.787

4.000

3.750

.125

1.750

1.625

1.122

4.000

.250

1.638

.181

1.625

.265

.315

.015

Dimension Table

Inches

max max

± .010 ± .010 ± .010 ± .010 ± .020 ± .020 ± .010 ± .010 ± .010 ± .020 ± .020 ± .010 ± .040

max max

26.10

147.00

101.60

92.25

44.45

41.28

28.50

101.60

41.60

41.28

Millimeters

max max ± .25

± .25

3.18

± .25

± .25 ± .50 ± .50 ± .25

6.35

± .25 ± .25

4.60

± .50 ± .50

6.73

± .25

7.00

± 1.02

0.38

max

0.38

max

Cheetah 1 8LP Product Manual, Re v. F 33

-Z-

-Z-T//

[1]

-Z- -X-N

-Z-

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom. Max screw penetration into side of drive is 0.15 in. (3.81 mm). Max screw tightening torque is 6.0 in-lb (3.32 nm) with minimum full thread engagement of

0.12 in. (3.05 mm).

-X-

[1]

-X-

Figure 18. LC and LCV mounting conf igur ation dimensions

Dimension Table

Inches

1.028

5.787

4.000

3.750 .125

1.750

1.122

4.000 .250

1.638 .181 .040

1.625

2.618 .276 .015 .015

max max

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

max

± .020 ± .010 ± .040

max max

B C D E F H

J K L

N P R S T U

Millimeters

26.10

147.00

101.60

92.25

3.18

44.45

28.50

101.60

6.35

41.60

4.60

1.20

41.28

66.50

7.00

0.38

max max

± .25

± .25 ± .50 ± .25 ± .25 ± .25 ± .50

max

± .50 ± .25 ± 1.02

max max

34 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 35

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 SCSI system involves the drive internal defect/error management a nd SCSI systems error considerations (errors in communications between Initiator and the drive). Tools for use in designing a defect/error management plan are bri efly outlined in this section, with references to other sections where further details are given.

7.1 Dri ve internal defects

During the initial drive format operation at the factory, media defects are identified, tagged as b eing unusable, and their locations recorded on the drive primar y defects list (referred to as the “P” list and also a s the ETF defect list). At fac tory format time, these known defects are also reallocated, that is, reassigned to a new place on the medium and the locati on listed in the defects reallocation table. The “P” list is not altered after factory formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the Read Defect Data command (see the appropriate SCSI Interface Product Manual).

7.2 Drive error recovery procedures

Whenever an error occurs during drive operation, the d rive, if programmed to do so, performs error recovery procedures to attempt to recover the data. The error recovery procedures used depen d on the options previously set up in the error recovery parameters mode page. Error recovery and defect management m ay involve the use of several SCSI commands, the details of which are descri bed in the S CSI Interface Product Manual. The drive implements selectable error recovery time limits such as are required in video applications. For additional information on t his, refer to the Error Recover y Page table in the a ppropriate SCSI Interface Product Manual, which describes the Mode Select/Mode Sense Error Recovery parameters.

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 limited via the Recovery T ime Limit bytes in the Error Rec overy Mo de 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 11 levels for read recoveries and 5 levels for writes. Table 5 equates the Read and Write Retr y Count with the maximum possible recovery time for read and write

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 comm and has not yet been met . Time needed to perform reallocation is not counted against the Recovery Time Limit.

The Read Continuous (RC) bit, when set to one, requests the disc dr ive to transfer the requested data length without adding delays (for retries or ECC correction) that may be req uired to insure data integrity. The disc drive may send erroneous data in order to maintain the continuous flow of data. The RC bit should only be used when data integrity is not a concer n and speed is of utmost impor tance. If the Recovery Time Limit or retry count is reached during error rec overy, the state of the RC b it is examined. If the RC bit is set, the dr ive will transfer the unrecovered data with no error indication and continue to execute the remaining com mand. If the RC bit is not set, t he drive will stop data transfer with the last goo d LBA, and report a “Check Condition, Unrecovered Read Error.”

36 Cheetah 18LP Product Manual, Rev. F

Table 5: Read and write retry count maximum recovery times [1]

Read retry count [1]

0 65.7 0 35.8 1 77.6 1 53.7 2 89.6 2 59.7 3 113.4 3 77.6 4 149.3 4 185.1 5 197. 0 5 (default) 226.9 6 244.8 7 334.3 8 394.0 9 441.8 10 549.2 11 2,009.2 12 (default ) 4,283.8

Maximum reco very ti me per LBA (cumulative, msec)

Writ e re try count

Maximum recovery time per LBA (cumulative, msec)

[1] These values are subject to change.

Setting these retry counts to a value below the default setting could result in an increased unrecovered error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the drive not performing error recovery.

For example, suppose the Read/Wr ite Recovery page has the RC bit set to 0, read retry count set to 4, and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A four LBA Read command is allowed to take up to 209 msec recovery time for e ac h of the four LBAs in the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery Tim e Limit field allows finer granularity on control of the time spent in error recov ery. The recovery time limit only starts counting when the dr ive is executing error recovery and it restarts on each command. Therefore, each command’s total recovery time is subject to th e recover y time limit. Note: A recover y time limit of 0 will use the drive’s def ault value of FF FF. Minimum recovery time limit is achieved by setting the Recovery Time Limit field to 00 01.

7.3 SCSI system s errors

Information on the reporting of operational errors or faults across the interface is given in the appropriate SCSI Interface Product Manual. Message Protocol System is described in the SCSI Interface Product Manual. Sev-

eral of the messages are used in the SCSI systems error management system. The Request Sense command returns information to the host about numerous kinds 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 appropriate SCSI Interface Product Manual. Status reporting plays a role in the SCSI system s error management and its use in that respect is described in sections where the various commands are discussed.

Cheetah 1 8LP Product Manual, Re v. F 37

8.0 Installation

Note.

The first thing to do when installing a drive is to set the drive SCSI ID and set up certain operating options. This is usually done by installing small shorting jum pers on t he pins of c onnectors J2 and J6 on t he PC BA (or J1Auxiliary on the LW/LWV models), or via the dr ive to host I/O signals on the L C model. Some us ers connect cables to J6 or J5-Aux iliary and perfo rm the set- up us in g r e m o te switch es.

If your system is “SCAM” (SCSI Configured Automatically) compliant, the system assigns the drive SCSI ID over the interface, so there is no need to be concerned about drive SCSI ID. Setting the drive SCSI ID jumpers doesn’t hurt anything, but is not necessary.

If your syste m is not “SCAM” compliant you do need to set the drive SCSI ID using the ID jumpers.

Configure drive options

For option jumper locations and definitions refer to Figures 19, 20, and 2 1. 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

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

• If the drive is the only device on the bus, attach it to the end of the SCSI bus cabl e. The user, system integra-

These drives are designed to b e us ed only on single-ended (SE) or l ow voltage differential (LVD) busses. Do not install these drives on a high voltage differential (HVD) bus.

because ID 7 is the highest priority on both 8 and 16 bit data buses.

the bus.

tor, or host equipment manufacturer must provide external ter mi nators.

Note.

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

• Installation instructions are provided by host system documentation or with any additionally purchased drive

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

Formatting

• It is not necessary to low level format this drive. The drive is shipped from the factory low level formatted in

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

• High level formatting the drive involv es assigning one or more partitions or logical drives to the drive volume.

8.1 Dri ve ID/optio n select heade r

Figures 19 and 20 show views of the drive ID select jumper connec tors. Figure 21 shows the option select jumper connector for all models. Figure 19 shows the drive’s J 5-auxiliary jumper conn ector. Both J5-auxiliary 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 t he drive. The notes following the figures describe the functions of the various jumper positions on the connectors J2, J5-Auxiliar y and J6. Suggested part number for the jumpers used on J2 is Molex 52747-0211 (Seagate part number 77679052). A bag with the two jumper plug types is shipped with the standard OEM drives.

For additional information about ter m inator requirement s, 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.

38 Cheetah 18LP Product Manual, Rev. F

Drive Front

Jumper Plug

(enlarged to show detail)

Pin 1

[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

[4]

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

[4]

Alternate Usage Plug:

+5V

[6]

Reserved

Pins

1197531

6842

Ground

Do not install jumpers; retain cover.

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

[4]

connected to host supplied optional usage plug.

Do not connect anything to pins 13-20.

Figure 19. J6 jumper header

Drive Activity LED

Cheetah 1 8LP Product Manual, Re v. F 39

Drive HDA (rear view, PCB facing downward)

68 Pin

SCSI I/O Connector

[4]

Pin 1

+5V Ground

Pin 1

[2]

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

1197531

Host Alternate Usage Plug

Reserved

N.C.

[4]

12 10 8 6 4 2

+5V

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

N.C.

Ground

Drive Activity LED

A0A1A2A

[1] [2]

1P2P3P4P

J1-DC Power

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.

PCB

Figure 20. J5 jumper header (on LW and LWV models only)

40 Cheetah 18LP Product Manual, Rev. F

Additional notes on these

functions in section 8.1.2.

Jumper

Positions

Force single-ended bus mode

Delay Motor Start

Enable Remote Motor Start

Write Protect

Parity Disable

Reserved

Term. Power to SCSI Bus

SEDSMEWPP

Pin 1

EST

[3]

(applies to “LW” model only; reserved on “LC” model)

Jumper Plug

(enlarged to show detail)

Drive Front

Figure 21. J2 option select header

8.1.1 Notes for Figures 19, 20, and 21.

[1] Notes explaining the functions of the various jumpers on jumper header connectors J2, J5, and J6 are

given here and in Section 8.1.2. The term “

default

” means as standard OEM units are configured with a jumper on those positions whe n shipped from factory. “Off” means no jumper is installed; “On” means a jumper is installed. OFF or ON underlined is factory

default

condition.

The PCBA on LC and LCV models does not have connector J5. The J5 connector signals conform t o SFF-8009 Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.

[2] These signals are also on 80-pin J1 I/O connector. See Tables 18 and 19. [3] Vol tage supplied by the drive.

Cheetah 1 8LP Product Manual, Re v. F 41

8.1.2 Function description

J2 jumper installation Jumper function descripti on

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, depend-

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

Default

is SE jumper not installed.

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 WP jumper not 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

Off

Reserved jumper position.

Default

is no

RES

jumper installed.

TP1 (Do es not apply to “LC” or “LCV” models)

Off The drive does not supply terminator power to external terminators or to the SCSI bus I/O

cable.

On Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a

jumper on the

TP1

position may be needed to power external terminators (see system docu-

mentation). These drives do not have terminator circuits on the drive.

42 Cheetah 18LP Product Manual, Rev. F

8.2 Dri ve 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 designed by the customer so that the amb ient temp erature immediately s urrounding the drive will not exceed temperat ure conditions specified in Section 6 .4.1, “Te mperature.” Specific consider- ation should be given to make sure adequate air circulation is present around the printed circuit board (PCB) to meet the requirements of Section 6.4.1, “Temperature.”

8.3.1 Air flow

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

Forced air flow may be requi red to keep temperatures at or below the specified case temperatures of Table 3, in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is created while providing air flow to the electronics and HDA. Also, t he shortest possible path between the air inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources within the rack, cabinet, or drawer environment.

If forced air is determined to be neces sary, possible air-flow patterns are shown in Figure 22 . The ai r-flow patterns are created by one or more fans, either forcing or draw ing air as shown in the illustrations. Conduction, convection, or other forced air-flow patterns are acceptable as long as the temperature measurement guidelines of Section 6.4.1 are met.

Above unit

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

Under unit

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

Figure 22. Air flow (suggested)

Above unit

Under unit

Cheetah 1 8LP Product Manual, Re v. F 43

8.4 Dri ve moun ting

When mounting the drive using the bottom holes (x-y plane in Figure 16) care must be taken to ensure 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:

k * x = F < 15lb = 67N

where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane mountin g surface di stor tion (uni ts of inc hes or mi llimeters ). The o ut-of-plan e distor tion (‘x’) is determined by defining a plane with t hree of the four mounting points fixed and evaluating the out-of-plane deflection of the fourth mounting point when a known force (F) is applied to the fourth point.

Note.

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 specifications given herein while mounted in such an adapter frame. Adapter frames that are available may not have a mechanical struct ure capable of mounting the drive so that i t can meet t he shoc k and vibration specifications listed in this manual.

8.5 Grounding

Signal ground (PCBA) and HDA ground are connected together in th e drive and cannot be separated by the user. The equipment in which the drive is mounted is connected di rectly to the HDA and PCBA with no el ec tr ically isolating shock mounts. If it is desired for the system chassis to not be connected t o the HDA/PCBA ground, the systems integrator or user must provide a nonconduc tive (electrically isolating) met hod of mount ing the drive in the host equipment.

Increased radiated emissions may result if you do no t provide the maximum s urface area ground connection between system ground and drive ground. This is t he system designer’s and integrator’s responsibility.

44 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 45

9.0 Interface requirements

This section partially describes the interface requirements as implemented on the drives.

9.1 General description

This section describes in essentially general terms the interface requirements supported by the Cheetah 18LP. No attempt is made t o describe all of t he minute details of c onditions and constraints that must b e c onsid ered by designers when designing a system in whi ch this family of drives can properly operate. Seagate d eclares that the drives operate in accordance with the appropriate ANSI Standards referenced in various places herein, with exceptions as noted herein or in the appropriate Seagate SCSI Interfa ce Product M anual (P/N 77738479 for ST318203 and ST39103 drives and P/N 75789509 for ST318233 and ST39133 drives).

9.2 SCSI interface m essag es sup ported

Table 6 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Cheetah 18LP family drives.

Table 6: SCSI messages supported by Cheetah 18LP family dri ves

Supported by

Message name Message code

Abort 06h Y Abort-tag 0Dh Y Bus device reset 0Ch Y Clear ACA 16h N 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 (ST318233 and ST39133 only) [1] [2] Y

Queue tag messages (two bytes)

ACA 24h N Head of queue tag 21h Y Ordered queue tag 22h Y

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

Notes.

[1] Extended messages (see the appropriate SCSI Interface Product Manual). [2] Supports all options except qas_req and iu_req.

SCSI-2/3

46 Cheetah 18LP Product Manual, Rev. F

9.3 SCSI interface comm a nds suppor ted

Table 7 following lists the SCSI interface commands that are suppor ted in the SCSI -2, and SCSI-3 modes of the drive. Cheetah 18LP Family drives can be changed back and forth bet ween SCSI-1 and SCSI-2/SCSI-3 modes using the Change Definition Command . OEM standard drives are shipped set to operate in SCSI-2/ SCSI-3 mod e.

Table 7: Commands suppor ted by Cheetah 18LP fami ly drive

Command name

Command code

Supported by SCSI-2/3

Change definition 40h Y (N for Ultra160) Compare 39h N Copy 18h N Copy and verify 3A h N Format unit [1] 04h 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 12h Y

Date code page (C1h) 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

PCR bit Y

DU bit N

DS bit Y

TSD bit Y

ETC bit N

TMC bit N

LP bit N Log sense 4Dh Y Application client log page (0F) Y (Ultra160 only)

Cache statistics page (37h) Y

Non-medium error page (06h) Y

Pages supported list (00h) Y

Read error counter page (03h) Y Self-test results page (10h) Y (Ultra160 only) Start-stop cycle counter page (0Eh) Y (Ultra160 only) Temperature page (0Dh) Y (Ultra160 only)

Veri fy error counter page (05h) Y

Write error counter page (02h) Y Factory log page (3Eh) Y Mode select (same pages as Mode Sense 1Ah) 15h Y [2] Mode select (10) (same pages as Mode Sense 1Ah) 55h Y

Cheetah 1 8LP Product Manual, Re v. F 47

Table 7: Commands suppor ted by Cheetah 18LP fami ly drive (Continued)

Command name

Command code

Supported by SCSI-2/3

Mode sense 1Ah Y [2]

Caching parameters page (08h) Y Control mode page (0Ah) Y Disconnect/reconnect (02h) 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) (same pages as Mode Sense 1Ah) 5Ah Y Prefetch 34h N Read 08h Y Read buffer (modes 0, 2, 3 supported). Ah and Bh modes

3Ch Y

also supported by Ultra160 Read c apacity 25h Y Read defect data (10) 37h Y Read defect data (12) B7h Y Read extended 28h Y DPO bit supported Y FUA bit supported Y Read long 3Eh Y Reassign blocks 07h Y Receive diagnostic results 1Ch Y

Supported diagnostics pages (00h) Y

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

Actual ret ry count bytes Y

Extended sense Y

Field pointer bytes Y Reserve 16h Y

3rd party reser ve Y

Extent reservation N Reserve (10) 56h Y 3rd pa rt r eserve Y Extent reservation N Rezero unit 01h Y Search data equal 31h N Search data high 30h N Search data low 32h N Seek 0B h Y Seek extended 2Bh Y

48 Cheetah 18LP Product Manual, Rev. F

Table 7: Commands suppor ted by Cheetah 18LP fami ly drive (Continued)

Command

Command name

code

Send diagnostics 1Dh Y

Supported diagnostics pages (00h) Y

Translate page (40h) Y Set limits 33h N Start unit/stop unit (spindle ceases rotating) (1Ch) 1Bh Y Synchronize cache 35h Y Test unit ready 00h Y Verify 2Fh Y BYTCHK bit Y Write 0Ah Y Write and verify 2Eh Y DPO bit Y Write buffer (modes 0, 2, supported) 3Bh Y Firmware download option (modes 5, 7 supported) .

Ah and Bh also supported by Ultra160. [3] Write extended 2Ah Y DPO bit Y FUA bit Y Write long 3Fh Y Write same 41h Y PBdata N LBdata N XDRead 52h N XDWrite 50h N XPWrite 51h N

Supported by SCSI-2/3

[1] The drive can format to any even number of bytes per sector from 512 to 4,096. [2] Tables 9 show how individual bits are set and which are changeable by the host.

WARNING:

[3]

A power loss during flash programming can result in firm ware corr uption. Thi s usu ally makes

the drive inoperable.

Cheetah 1 8LP Product Manual, Re v. F 49

Table 8 lists the Standard Inquiry command data that the drive should return to the initiator per the format given in the SCSI Interface Product Manual, Inquiry command sec tion.

Table 8: Cheetah 18LP family drive Standard Inquiry data

Bytes Data (HEX)

0-15 00 00 [02]1[12]28B 00 [01] [3E] 53 45 41 47 41 54 45 20 VENDOR ID

16-31 53 54 [33] [31] [38] [32] [30] [33] [ 4C] [57] [20] 32-47 R# R# R# R# S# S# S# S# S# S# S# S# 00 00 00 00 48-63 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 [32] COPYRIGHT

112-127 [30] [30] [30] 128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20

01 means SCSI-1 implemented;

[]

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

20 20 20 20 20 PRODUCT ID

02 means SCSI-2/SCSI-3 implemented.

[]

The drive can be changed between these two configurations: 01 means response data in SC SI-1 form at and has co mpa tib ilit y with Com m on Co mm and S et data. 02 means response data in SCSI-2/SCSI-3 format (default is 02).

R# Four ASCII d igits represent ing the last four digits of the product Firmware Rele ase num ber. This informa-

tion is also given in th e Vital Product Dat a page C0h, t ogether with ser vo RAM and ROM rel ease numbers.

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

[]

Bytes 18 through 26 reflect model of drive. Shown here are hex values for Model ST318203LW. For ST39103 drives, bytes 18 through 23 are: 33 39 31 30 33 00. For ST318233 drives, bytes 18 through 23 are: 33 31 38 32 33 33. For ST39133 drives, bytes 18 through 23 are: 33 39 31 33 33 00.

For “LW” models, bytes 24, 25 and 26 are 4C 57 20. For “LWV” model s, bytes 24, 25 and 26 are 4C 57 56 For “LC” models, bytes 24, 25 and 26 are 4C 43 20. For “LCV” models, bytes 24, 25 and 26 are 4C 43 56.

[]

9.3.1 Inquiry Vi tal Product data

Instead of the standard Inquiry data shown in Table 8, the initiator can request several Vital Product Data pages by setting the Inquiry command E VPD bit to one. The SCSI Interface Product Manual lists the Vita l Product Data pages an d describes their formats. A separate Inquir y command must be se nt to the drive for each Vital Product Data page the initiator wants the drive to send back.

50 Cheetah 18LP Product Manual, Rev. F

9.3.2 Mode Sense data

The Mode Sense com mand provides a me ans for the drive to repor t its operating parameters to the in itiator. The drive maintains four sets of Mode paramete rs, Default values, Saved values, Current values and Changeable values.

Default values are hard coded in the drive firm ware that is stored in f lash EPROM no nvolatile memory on t he drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash EPROM. An initiator can request and receive from the dr ive a list of default values and use those i n 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 are allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters in the saved values list that are not chan geable by the Mode Select command get t heir values from the default values storage.

Current values are volatil e values currently being used by the drive t o control its operation. A Mode Select command can be used to c han ge t hese values (only thos e that are changeable). Originally, t hey are insta lled 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, t hat dictates which of the current values and saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a “zero” allows no change. For example, in Table 9 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, because those fields are all zeros. If some changeable code had a hex value EF, tha t 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 0 1, those 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 dr ives 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 ta kes saved values from the media and stores them to the current 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 control firmware in the total population of drives in the field, the Mode Sense values given in the following tables may not exactly match those of some drives.

Cheetah 1 8LP Product Manual, Re v. F 51

The following tables list the values of the data bytes returned by the drive in response to the Mode Sense command pages for SCSI-2/SCSI-3 implementation (see the appropriate SCSI Interface Product Manual).

Definitions: DEF = Default value. Standard drives are shipped configured this way.

CHG = Changeable bits; indicates if current and saved values are changeable.

Note.

Table 9: Mode sense data, ST318203 and ST318233 values (SCSI-2/3 implementation)

Bytes 0001020304050607080910 1112 1314151617181920212223

Mode Sense Data

Mode Page

01 DEF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

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 DEF 83 16 02 A5 00 00 00 04 00 00 01 03 CHG

04 DEF 84 16 00 26 2C 0C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 27 20 00 00 04 CHG

07 DEF 87 0A 00 0B E8 00 00 00 00 00 FF FF 07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF

Saved values for OEM drives are normally the same as the default values.

9F 00 10 08 02 1E B3 90 00 00 02 00

<------------------------------Mode P age Headers and Parameter Data Bytes---------------------------->

81 0A C0 0B E8 00 00 00 05 00 FF FF

[1]

2F 02 00 00 01 00 2C 00 38 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 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

08 DEF 88 12 14 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00 08 CHG 88 12 B5 00 00 00 FF FF FF FF 00 00 A0

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

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 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 DEF 80 02 00 00 00 CHG 80 02 77 40

Read capacity data

02 1E B3 8F 00 00 02 00

[2]

FF 00 00 00 00 00 00

[1] The value of this byte will change depending on the amount of buffer memory available. [2] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function govern ed by that bit is not imple-

mented by this drive.

52 Cheetah 18LP Product Manual, Rev. F

T able 10: Mode sense data, ST39103 and ST39133 values (SCSI-2/3 implementation)

Bytes 0001020304050607080910 1112 1314151617181920212223

Mode Sense

9F 00 10 08 01 0F 59 C8 00 00 02 00 Data Mode

<-------------------- -- -- ------M od e Page H e a ders and Parame te r Data Byt es - ------- -- -- ---------------->

Page 01 DEF

81 0A C0 0B E8 00 00 00 05 00 FF FF 01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

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 DEF 83 16 0A EC 00 00 00 0D 00 00 01 03 CHG

83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

[1]

30 02 00 00 01 00 2C 00 38 40 00 00 00

04 DEF 84 16 00 26 2C 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 27 20 00 00 04 CHG

84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 07 DEF 87 0A 00 0B E8 00 00 00 00 00 FF FF

07 CHG 87 0A 0F FF 00 00 00 00 00 00 FF FF 08 DEF 88 12 14 00 FF FF 00 00 FF FF FF FF 80 03 00 00 00 00 00 00

08 CHG 88 12 B5 00 00 00 FF FF FF FF 00 00 A0

[2]

FF 00 00 00 00 00 00

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

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 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 DEF 80 02 00 00 00 CHG 80 02 77 40

Read capacity data

01 0F 59 C7 00 00 02 00

[1] The value of this byte will change depending on the amount of buffer memory available. [2] Though byte 12, bit 7 (A0) is shown as changeable, the FSW function govern ed by that bit is not imple-

mented by this drive.

Cheetah 1 8LP Product Manual, Re v. F 53

9.4 SCSI bus conditions and miscellaneous features supported

Asynchronous SCSI bus conditions suppor ted by the drive are listed below. These conditions cause the SCSI device to perform certain ac tions and can alter the SCSI bus phas e sequence. Other miscellaneou s operating features supported are also listed here. Refer to the appropriate SCSI Interface Product Manual, for details.

Table 11: SCSI bus conditions and other miscellaneous features

Condition/feature supported by:

SCSI-2/SCSI-3 Conditions or feature

N Adaptive Caching Y Arbitrating System Y Asynchronous Data Transfer N Asynchron ous Event Notification Y Attention Condition N Auto Conti ngent Allegiance Condi ti on Y Contingent Allegiance Condi tion Y Deferred Error Handling Y Disconnect/Reconnect N High vo lt age differential (HVD) interface available Y Low voltage differential (LVD) interface avai lable Y Parameter Rounding (controlled by the Round bit in Mode Select page 0) Y Queue tagging (up to 64 Queue tags supported) Y Reporting actual retry count in Extended Sense bytes 15, 16 and 17. Y Reset Condition Y Segmented Caching Y SMP = 1 in Mode Select command needed to sav e RPL and Rotat ional Offset by tes (See RPL in

the Rigid Drive Geometry P arameters table in the appropriate SCSI Interface Product Manual) Y Synchronous Data Transfer N Zero Latency Read

SCSI-2/SCSI-3 Status supported

YGood Y Check Condition Y Condition Met/Good YBusy Y Intermediate/Good Y Intermediate/Condition Met/Good Y Reservation Conflict Y Queue Full N ACA Active

54 Cheetah 18LP Product Manual, Rev. F

9.5 Synchronous data transfer

9.5.1 Synchronous data transfer periods supported ST318203 and ST39103 models:

Table 12 lists the synchronous data transfer periods supported by the drive. The data transfer period to be used by the drive and the initiator is established by an exchange of message s during the Message Phase of operation. See the section on message protocol in the SCSI Interface Product Manual, part number 77738479.

Table 12: Synchronous data transfer peri ods

M (decimal)

Transfer period (nanoseconds)

Transfer rate (megatransfers/second)

9 12.5 80.0 [1] 10 25 40.0 [2] 12 50 20.0 25 100 10.0 50 200 5.0

[1] This transfer rate is only allowed when using the LVD interface. [2] This transfer rate is only allowed when using the LVD interface on

ST318203 and ST39103 model drives.

ST318233 and ST39133 models:

The data transfer period to be used by the drive and the initiator is e stablished by an exchange of messages during the Message P hase of operation. See the sec tion on message protocol in the SCSI Interface Product Manual, par t numb er 757895 09. In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that represents the associated transfer period and transfer rate values.

Table 13 lists the synchronous data transfer periods supported by the d rive in DT Dat a phas e. DT Dat a p has e is only allowed when using the LVD interface.

Table 13: Synchronous DT Data transfer per iods

M (decimal)

Transfer period (nanoseconds)

Transfer rate (megatransfers/second)

9 12.5 80.0 10 25 40.0 12 50 20.0 25 100 10.0

Table 14 lists the synchronous data transfer periods supported by the drive in ST Data phase. ST Data phase is allowed with either L VD or SE interface except as noted.

Table 14: Synchronous ST Data transfer per iods

M (decimal)

Transfer period (nanoseconds)

Transfer rate (megatransfers/second)

10 25 40.0 [1] 12 50 20.0 25 100 10.0 50 200 5.0

[1] This transfer rate is only allowed when using the LVD interface.

9.5.2 REQ/ACK offset

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

Cheetah 1 8LP Product Manual, Re v. F 55

9.6 Physical interface

This section describes the connectors, cables, signals, terminators and bus timing of t he DC and SCSI I/O interface. See Section 9.8 and Section 9.9 for additional terminator information.

Figures 23 and 24 show the locations of the DC power connector, SCSI interface connector, drive select headers, and option select headers.

Details of the physical, electrical and logical characteristics are g iven in sections following, while the SCSI operational aspects of Seagate drive interfaces are given in the SCSI Interface Product Manual.

9.6.1 DC cable and connector

LW and LWV model drives recei ve DC power through a 4 pin connec tor (see Figure 25 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.

Typ e of cabl e Connector Contacts (20-1 4 AWG)

14 AWG MP 1-480424-0 A M P 60619-4 (Loose Piec e)

AMP 61117-4 (Strip)

LC and LCV model drives receive power through the 80-pin I/O connector. See Tables 18 and 19.

56 Cheetah 18LP Product Manual, Rev. F

Pin 1

Pin 1A J1

Pin 1

68 Pin

SCSI I/O

Connector

1P 2P 3P 4P

Pin 1P

Pin 1A

J1-DC Power

Power

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

J1-DC Power

1P2P3P4P

PCB

Figure 23. LW and LWV model drive physical interface (68-pi n J1 SCSI I/O connector)

80-pin

SCSI I/O

Connector

Pin 1

Figure 24. LC and LCV model drive ph ysical interface (80-pi n J1 SCSI I/O connector)

Cheetah 1 8LP Product Manual, Re v. F 57

9.6.2 SCSI interface physical description

The drive models described by this product manual support the physical interface requirements of the SCSI-3 Parallel Interface-2 (SPI-2) standards as defined in American National Standard docum ent X3T1 0/1 142D revision 14, and operate compat ibly at the interface with devices that suppor t earlier SCSI-2 and S CSI-3 standards. It should be noted that this is only true if the systems engineering has been correctly done, and if earlier SCSI-2 and SCSI-3 devices respond in an acceptable manner (per applicable SCSI Standards) to reject newer SCSI-3 protocol extensions that they don’t support.

The drives documented in this manual support single-ended and low voltage differential physical interconnects (hereafter referred to as SE and LVD, respectively) as descr ibed in the ANSI SPI-2 standard. T hese drives implement driver and receiver circuits that can operate either SE or LVD. However, they cannot switch dynamically between SE and LVD operation.

The drives typically operate on a daisy-chain interface in which other SCSI devices are also operating. Devices on the daisy chain must all operate in the same mode, either SE or LVD, but not a mixture of these. On the 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 te rminated at both ends with the proper impe dance in order to operate correctly. Do not terminate intermediate S CSI devices. In some cases, the SCSI devices at each end have onboard termination circuits that can be enabled by installation of a jumper plug (TE) on the device. These termination circuits receive power from either a source internal to the device, or f rom a line in the interface cable specifically powered for that purpose. LC, LCV, LW and LWV model drives do not have onboard termination circuits. Some type of external termination circuits must be provided for these drives by the end user or designers of the equipment into which the drives will be integrated. See Standard X3T10/ 1142D, sections 6.4 and 6.5 for the maximum number of devices that can successfully ope rate at various interface transfe r rates on SE and LVD daisy chains.

LC and LCV model dr ives 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 runs that have adequate DC current carrying capacity to suppor t the numbe r of dri ves plugged in to the PC BA o r bulkhead c onne ctors. A s ingle 80-pi n I /O c onnect or cable cannot suppor t the DC current needs of several drives, so no daisy chain cables beyond the bulkhead connectors should be used. A single drive connec ted via a cable to a host 80-pin I/O conne ctor is not recommended.

Table 15 shows the interface transfer rates supported by the various drive models defined in this manual.

Table 15: Interface transfer rates supported

Maximum transfer rate

Interface typ e / drive models

ST318203 ST318203 ST39103 ST39103

LVD

ST318203 ST318203

LC/LCV

LW/LWV LC/LCV LW/LWV

LC/LCV

LW/LWV

Asynchronous Fast-5 Fast-10

yes yes yes yes no no

yes yes yes yes yes no

Fast-20 (Ultra)

Fast-40 (Ultra2)

Fast-80 (Ultra160)

ST39103LC/LCV ST39103LW/LWV

LVD

ST318233 ST318233 ST39133 ST39133

ST318233 ST318233

LCV

LWV LCV LWV

LCV

LWV

yes yes yes yes no no

yes yes yes yes yes yes

ST39133LCV ST39133LWV

58 Cheetah 18LP Product Manual, Rev. F

9.6.3 SCSI interface cable requirements

The characteristics of cables used to connect SCSI -3 parallel interface devices are discussed in detail in section 6 of ANSI Standard X3T10/11 42D. The cable characteristics that must be considered when interconne cting 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 minimize discontinuances and signal reflections, cables of different impedances should not be used in the same bus. Implementations may require trade-offs in s hielding 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 impedance m ismatch mus t be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at FAST-20 and FA ST-40 S CSI transfer rates.

Note.

For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair cables are strongly recommended. For Fast-80 (Ultra160) operation, twisted pair cables are required.

LC and LC V m odels:

The 80-pin connector option is intended for use on drives that plug directly into backplane connector in the host equipment. In such installations, all backplane wiring segments are subject to the electromagnetic concepts presented in Standard X3T10/1142D, section 6. For LC and LCV model drives, installations with connectors on cables are not recommended.

9.6.4 Mating connectors

Part numbers for the different type connectors that mate with the various Cheetah 18LP I/O connectors are given in the sections following.

9.6.4.1 Mating connectors for LW and LWV m odel drives

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)

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 AW G wire).

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

installat ions [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 25. The drive device connector is a nonshielded 68 conductor connector consist ing of two rows of 34 female pins

with adjacent pins 50 mils apart. The connector is keyed by means of its shape (see Figure 26).

Cheetah 1 8LP Product Manual, Re v. F 59

9.6.4.2 Mating connectors for LC and LCV model drives

The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 contacts with adjacent contacts 50 (1.27 mm) mils apart (see Figure 27). I/O conne ction using a cable is not recommended. The length and size of the host equipment DC power carrying conduc tors from the DC power source to the host equipment 80-pin disk drive interface connector(s) should be strictly designed according to proper power transmission design concepts. No possibi lity for the equipment user to attach an 80-pin cable/connect or should be allowed, since the length of the DC power carrying conductors could not be controlled and therefore could become too long for safe p ower transmission to the drive. Daisy-chain 80-conductor cables should especially not be allowed, since the power-carrying conductors on the 80-conductor interface were not intended to support a series of drives.

To insure that both drive connector and host equipment mating connector mate proper ly, both drive c onnector and host equipment mating connect or must meet th e provisions of “SFF-8 046 S pec ification for 80-pin connector for SCSI Disk Drives.”

60 Cheetah 18LP Product Manual, Rev. F

Recommended mating 80-position PCBA mount con nectors:

Straight-in connect or 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

Righ t -angle to PCB A conne ctors

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

Terminator

[6]

SCSI ID 1

[2]

SCSI ID 0

[2]

[7]

2 through X

SCSI devices [4]

Pin 1

(check your

adapter for Pin 1 location)

SCSI ID 7 [5]

[1]

Host Adapter

PCB

[3]

[1] Closed end type 68-pin connector used. Ter m inat ors enabled. [2] Open end type (in-line application) connector used. [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 n ot exceed that specified in ANSI doc ument X3T10/1142D (including

host adapter/initiator). The cable length restriction limits the total number of devices allowed. [5] SCSI ID7 has highest arbitration priority, then ID15 to ID8 (ID 8 very lowest). [6] Last drive on the daisy chain. [7] Open-end type 68-pin connector used. If end device, use external terminator and closed-end type 68-pin

connector.

Figure 25. SCSI daisy chain interface cabl ing for LW and LWV drives

Cheetah 1 8LP Product Manual, Re v. F 61

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.

.840 ± .005

(21.34)

.767

(19.48)

3.650

(92.71)

Figure 26. Nonshielded 68 pin SCSI device connector used on LW and L W V drives

+.001 –.002

dia

.083 (2.1)

Trifurcated Pins (4 places)

62 Cheetah 18LP Product Manual, Rev. F

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)

2.15±0.10 2 places

End View

Front View

Insert mating I/O connector

Top View

Contact

0.50

(.020)

0.3

(.012)

1.27

(.05)

Typ

MYM

Pin 1 Pin 40

Pin 41 Pin 80

of Datum Y

Figure 27. Nonshielded 80 pin SCSI “SCA-2” connector, used on LC and LCV drives

Grounding

Pins

Back View

Cheetah 1 8LP Product Manual, Re v. F 63

T able 16: L W 68-conductor single-ended (SE) P cable signal/pin assignm ents [11]

Note.

A minus sign preceding a signal name indicates that signal is active low.

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 Table 19.

64 Cheetah 18LP Product Manual, Rev. F

T able 17: L W 68-conductor LVD P cable signal/pin assignments [ 11]

Note.

Signal name [1]

A minus sign preceding a signal name indicates that signal is active low.

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 Ground 15 29 30 49 Ground DIFFSNS [8] 16 31 32 50 Ground TermPwr 17 33 34 51 TermPwr TermPwr 18 35 36 52 TermPwr Reserved 19 37 38 53 Reserved Ground 20 39 40 54 Ground +ATN 21 41 42 55 –ATN Ground 22 43 44 56 Ground +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 19.

Cheetah 1 8LP Product Manual, Re v. F 65

Table 18: LC 80-pin single-ended ( SE) I/O connector pin assignments [11]

Note.

A minus sign preceding a signal name indicates that signal is active low.

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 GND –DB10 8 48 GND –DB9 9 49 GND –DB81050GND –I/O1151GND –REQ1252GND –C/D1353GND –SEL1454GND –MSG1555GND –RST1656GND –ACK1757GND –BSY1858GND –ATN1959GND –DBP2060GND –DB72161GND –DB62262GND –DB52363GND –DB42464GND –DB32565GND –DB22666GND –DB12767GND –DB02868GND –DP12969GND –DB15 30 70 GND –DB14 31 71 GND –DB13 32 72 GND –DB12 33 73 GND

+5 V3474MATED 2 +5 V35755 V GND +5 V36765 V GND NC [10] 37 77 ACTIVE LED OUT [4] [9] RMT- STA RT [5] [9] 38 78 D LYD-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 19.

66 Cheetah 18LP Product Manual, Rev. F

T able 19: LC 80-pin single-ended (LVD) I/O connector pin assignments [11]

Note.

Signal name [1]

A minus sign preceding a signal name indicates that signal is active low.

Connector 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/O1151+I/O –REQ1252+REQ –C/D1353+C/D –SEL1454+SEL –MSG1555+MSG –RST1656+RST –ACK1757+ACK –BSY1858+BSY –ATN1959+ATN –DBP2060+DBP0 –DB72161+DB7 –DB62262+DB6 –DB52363+DB5 –DB42464+DB4 –DB32565+DB3 –DB22666+DB2 –DB12767+DB1 –DB02868+DB0 –DBP1 29 69 +DP1 –DB15 30 70 +DB15 –DB14 31 71 +DB14 –DB13 32 72 +DB13 –DB12 33 73 +DB12

+5 V3474MATED 2 +5 V35755 V GND +5 V CHARGE 36 76 5 V GND NC [10] 37 77 ACTIVE LED OUT [4] [9] RMT_ STA RT [ 5 ] [9] 3 8 78 D LYD_STA RT [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 this table.

Cheetah 1 8LP Product Manual, Re v. F 67

Notes [ ] for Tables 16 through 19.

[1] See Section 9.6.4.1 for detailed electrical characteristics of these signals. [2] The conductor number refers to the conductor position w hen using 0. 025-inch (0.635 mm) centerline 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 m otor via SCSI bus command). [6] Asserted by host to enable Delay ed Motor Start option (motor starts at power on or after a delay of 12 sec-

onds times drive ID). This and [3] above are mutually exclusive options. [7] Binary code on A3, A2, A1 and A0 asser t ed 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 Ultra2 SCSI data rates if this is grounded. [9] Signals [4] through [7] are used in place of installing jumpers and cables on option select 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 LVD I/O shall leave the following signals open: –DB8,

–DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the followi ng signals

open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.

All other signals should be connected as shown.

9.7 Electrical descr iption

Cheetah 18LP LW, LWV, LC and LCV model drives are mu ltimod e devices. That is, the ir I/O c ircuits c an operate as either single-ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).

See ANSI Standard X3T10/1142D for ST318203 and ST39103 model electrical spec ifications. See ANSI SPI-3 specification T10/1302D for ST318233 and ST39133 model electrical specifications.

9.7.1 Multimode—SE and LVD alternatives

When the interface “DIFFSNS” line is between +0.35 V a nd +0 .5 V, the drive interface circuits operate singleended and up to an d including 20 M transfers/s (Fast-20 or Ultra SCSI). When “DIFFSNS” is be tween +0. 7 V and +1.9 V, the ST3182 03 and S T39103 d rive interface circuits operate low voltage differential and up to a nd including 40 M transfers/s or less (Fast-40 or Ultra2 SCSI); the ST318233 and ST39 133 dri ve interface circuits operate low voltage differential and up to and including 80 M transfers/s or less (Fas t-80 or Ultra160 SCSI).

This multimode design does not allow dynamically changing transmission modes. Drives must operate only in the mode for which the installation and interface cabling is designed. Multimode I/O circuits use d by these drives do not operate at high voltage differential levels and should never be exposed to high voltage differential environments unless the common mode voltages in the environment are controlled to safe leve ls for singleended and low voltage differential devices (see the ANSI SPI-2 specification X3T10/1142 D for ST318203 and ST39103 models; see the ANSI SPI-3 specification T10/1302D for ST318233 and ST39133 models).

Multimode signals

Multimode circuit SE alternative signal characteristics are the same as descr ibed elsewhere in Section 9.7.1. The SE alternative for these circuits is selected as described above. SE cables and termination must be used.

LC, LCV, LW and LWV model drives do not have onboard terminators. The Multimode signal lines (either SE or LVD) should be terminated with 110 ohm active terminator circuits at each end of the total 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 signal (V

) driven by LVD in terface drivers shall have the following output characteristics when measured

at the disc drive connector:

68 Cheetah 18LP Product Manual, Rev. F

Steady state Low level output voltage* = –.95 V = < Vs = < –1.55 V (signal negation/logic 0) Steady state High level output voltage* = –.95 V = < V Differential voltage = +

0.6 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.

= < 1.55 V (signal assertion/logic 1)

*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference. The output characteristics shall additionally conform to EIA RS-485.

LVD Differential

Driver

Signal +

Signal –

LVD Differential

Driver

Signal +

Signal –

| = .6V

Figure 28. LVD output signals

1.55V

.95V +15ma

.95V

1.55V –15ma

–15ma

+15ma

= True / Logic 1 / Assertion

= False / Logic 0 / Negation

Input characteristics

Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics 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-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.

= < 3.6 V (signal negation/logic 0)

= < –0.030 V (signal assert ion/log ic 1)

(X3T10/1142D revision 13, p. 152) *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

LVD Signal Drivers

LVD

Receiver

LVD Signal Drivers

Single Ended Receiver

Single Ended Negation Driver

Single Ended Assertion Driver

Single Ended Ground Driver

Single Ended Circuitry

Ground

Single Ended: LVD:

GND

+Signal

Figure 29. Typical SE-LVD alternative transmitte r receiver circuits

–Signal –Signal

Cheetah 1 8LP Product Manual, Re v. F 69

9.7.1.1 Single-ended drivers/receivers

The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits depends on several factors. Table 20 l ists the maximum lengths allowed for different configurations of drive usage. These values are from the SPI-2 document. All device I/O lines must have equal to or less than 25 pf capacitance to ground, measured at the beginning of the stub.

Table 20: Cable characteristics for single-ended circuits

Transmission line impedance

I/O transfer rate

10M transfers/s 16 (wide SCSI bus) 6 meters (19.7 ft) 90 + 6 Ohms 90 + 10 Ohms

20M tran sfer s /s 4 (wide SCSI bus ) 3 meters (9 .8 ft) 90 + 6 Ohms 90 + 10 Ohms

20M transfers/s 8 (wide SCSI bus) 1.5 meter s (4.9 ft) 90 + 6 Ohms 90 + 10 Ohms

Maximum number of devices on the bus

maximum cable length allowed

REQ/ACK Other signals

A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.

Single-ended I/O cable pin assignments for LW and LWV drives are shown in Table 17. Single-ended I/O pin assig nments for LC and LCV models are shown in Ta ble 18. The LC model does not

require an I/O cable. It is designed to connect directly to a back panel connector.

9.7.1.2 Low voltage differential I/O circuits

The maximum total cable length for use with drives using LV D I/O drivers and receiver circuits is 12 meters (39.37 ft.). A stub length of no more than 0.1 meter is allowed off the mainline interconnection with any connected equipment. LVD I/O pin assignments for LW and LWV model drives are shown in tables 16 and 17. LVD I/O pin assignments for LC and LCV model drives are shown in tables 18 and 19.

9.7.1.3 General cable characteristics

A characteristic impedance of 100 ohm + 10% is recommended for unshielded flat or twisted pair ribbon cable. However, most available cables have a somewhat lowe r characteristic impedan ce. To Minimize discont inuities and signal reflections, cables of different impedances should not be us ed in the same bus. Implementations may require tradeoffs in shielding effectiveness, cable length, the numbe r of l oads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper impedance matching is especially important in order to maintain adequate margin at fast SCSI transfer rates.

9.8 Terminator requirements Caution:

These drives do not have onboard internal terminators. The user, systems integrator or host equipment manufacturer must provide a terminator arrangement external to the drive when termination is required. For LW and LWV drives, terminator modules can be purchased that plug between the SCSI I/O cable and the d rive I/O connector or on the en d of a shor t I/O cable st ub extending past the last cable connector. LC and LCV drives are designed to be plugged into a backpanel connector without cabling.

9.9 Terminator power LW and LW V drives

You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device supply terminator power to the external ter minator. See Sect ion 8.1 for illustrations that show how to place jumpers for this configuration.

LC and LCV drives

These drives cannot furnish terminator power because no conducto rs in the 80-pin I/O connector are devoted to terminator power.

70 Cheetah 18LP Product Manual, Rev. F

9.10 Disc drive SCSI timing

T able 21: Disc drive SCSI timing

These values are not current Cheetah 18LP 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 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 Iden tify MSG to Com mand 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 overhead Target win Arbitration (for Reselect) T12 4.5-7 3.00 µs Arbitration to Reselect T 13 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 Pointe r MSG T20 4.5-14 4.00 µs Save Data Pointer MSG to Disconnect MSG T21 4.5-14 0.79 µs Command Byte Tr ansf er 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

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

Cheetah 1 8LP Product Manual, Re v. F 71

T able 21: Disc drive SCSI timing (Continued)

These values are not current Cheetah 18LP values, but are listed for information only .

Description

Waveform symbol [1]

Waveform table [1] Typical timing

Next CDB Byte Access (Byte 10 of 10) T 23. 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 Tr ansfer (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 Transf er 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 4.5-5,8,15 0.04 µs Synchronous Data Transfer Characteristics:

Request Signal Tr ansf er Period [3] –– various (800 ns max)

Notes.

[1] See the appropriate SCSI Interface Product Manual, Timing examples section. [2] Maximum SCSI asynchronous interface transfer rate is given in Section 4.2.3 of this manual. [3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Dri ve. The Drive is

capable of setting periods as given in Section 9.5. See also the Synchronous data transfer section and the Extended messages s ection of the appropriate SCSI Interface Product Manual, for a description of syn- chronous data transfer operation.

9.11 Drive activity LED

The following table provides drive activity LED status.

Table 22: Drive activity LED status

Spindle status Command status LED status

Spinning up with DC power appl ied N/A On until spinup is complete Spun down Start Unit On while processing the command Powered down by removal of DC power N/A Off due to absence of power Spun up Stop Unit On while processing the command Spun down No command activity Off Spun down Write/Read Buffer On whil e processing the command Spun down SCSI Bus Reset On while processing the reset Spun down Test Unit Ready On while processing the command Spun up No command activity Off Spun up Write/Read On while processing the command Spun up SCSI Bus Reset On while processing the reset Spun up Test Unit Ready On while processing the command Spun up Format with Immediate option on On while the comm and is initially pr ocessed Spun up Format without Immediate LED toggles on/off on each cylinder boundary

72 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 73

10.0 Seagate Technology support se rvices Online Services

Internet

For online inf ormation about Seagate products, visit www .seagate.com or e-mail y our disc or t ape questions to:

Presales Support:

Disc: ht tp://www.seagate.com/suppor t/email/email_presales.html or DiscPresales@Seagate.com Tape: http://www.seagate.com/support/email/email_tape_presales.html or

Tape_Sales_Support@Seagate.com

Technical Suppor t :

Disc: ht tp://www.seagate.com/support/email/email_disc_support.html or DiscSuppor t@Seag ate.com Tape: http://www.seagate.com/support/email/email_tape_support.html or TapeSupport@Seagate.com

is a computer bulletin board system that contains information about Seagate disc and tape dr ive

SeaBOARD

products and is availabl e 24 hours daily. Set your communications software to eight data bits, no parity and one stop b i t (8 -N-1 ).

Automated Services

SeaFONE® (1-800-SEAGATE)

help services. U sing a touch-tone phone, you can find answers to service phone numbers, comm only asked questions, troubleshooting tips and specifications for disc drives and tape drives 24 hours daily. Inter national 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 technical

is Seagate's toll-free number (1-800-732-4283) to a ccess our automated s elf-

Presales Support

Our Presales Suppo rt staff c an help you deter mine which S eagate products are best suited for your specific application or computer system. Di sc: 1-877-271-3285; Tape: 1-800-626-6637.

Online Tape Purchases

US customers can purchase Seagate data cartridges, tape supplies, accessories, and select Seaga te tape drive products 24 hours daily at http://buytape.seagate.com.

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 conflicts and other t echnical issues. If you need additional help, you can talk to a Seag ate technical suppo rt specialist. Before calling, note your system configuration and dr ive model number (ST####).

SeaTDD™(+1-405-936-1687)

comments 24 hours dai ly and exchange messages with a t echnical su pport specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M . to 6:00 P. M. (central time) Monday through Friday.

is a telecommunications device for the deaf (TDD). You can send ques tions or

Customer Service (CSO)

Warranty Serv ic e

Seagate offers worldwide customer support for Seagate drives. Seagate direct OEM, Distribution and System Integrator customers should contact their Seagate service center representative for warranty information. Other customers should contact their place of purchase.

74 Cheetah 18LP Product Manual, Rev. F

Authorized Service Centers

If you live outside the US, you can contact an Authorized Service Center for service.

USA/Canada/Latin America Support Services

Presales Support

Disc: 1-877-271-3285 or +1-405-936-1210 FAX: +1-405-936-1683 Tape: 1-800-626-6637 or +1-714-641-2500 FAX: +1-714-641-2410

T e c hnical Support (SeaFONE)

1-800-SEAGATE or +1-405-936-1234 (for specific product phone number) FAX: Disc: +1-405-936-1685; Tape: +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 Serv ic e

USA 1-800-468-3472 FAX: +1-405-949-6740 Mexico and Latin America +1-405-9 49-7758 FAX: +1-405-949-6738

Canada

Memofix* +1-905-660-4936 or 1-800-636-6349 FAX: +1-905-660-4951

http://www.memofix.com

Adtech* +1-905-812-8099 or 1-800-624-98 57 FAX: +1-905-812-7807

http://www.adtech1.com

Brazil

MA Informatica +55-21-516-6649 FAX: +55-21-223-3156

e-mail: sgt_cso@gbl.com.br

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.

A.M

If your country is not listed here, dial our European call center at +31-20-316-7222 from 8:30 (European central time) Monday through Friday. The European call center is located in A msterdam , The Net herlands.

. to 5:00 P.M.

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

*Authorized Service Centers

Cheetah 1 8LP Product Manual, Re v. F 75

Turkey 00 800-31 92 91 40 United Kingdom 0 800-783 5177

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, wa rranty service a nd FAX ser vices in Africa and the Middle East , dial our European call center at +31-20-316-7222 from 8:30 a.m. to 5:00 p. m . (European central time) Monday through Friday, or send a FAX to +31-20-653-3513. The European call center is located in Amsterdam, The Netherlands.

Asia/Pacific Support Services

T e c hnical Support

Australia +61-2-9725-3366 FAX: +61-2-9725-4052 Hong Kong +852-2368 9918 FAX: +852-2368 7173 Japan — FAX: +81-3-5462-2979 Singapore +65-488-7584 FAX: +65-488-7528 Taiwan +886-2-2514 -2237 FAX: +886-2-2715-2923

SeaFAX

Australia +61-2-9756-5170

Warranty Serv ic e

Japan + 81-3-5462-2904 FA X: +81-3-546 2-2979 Asia/Pacific and Australia +65-485-3595 FAX: +65-488-7503

76 Cheetah 18LP Product Manual, Rev. F

Cheetah 1 8LP Product Manual, Re v. F 77

Index

bytes/surface bytes/track

Symbols

+5 and +12 volt supplies 20

Numerics

68 conductor connector 58 68-pin connector 80 conductor connector 80 conductor interface 80 pin connector option 80 pin I/O connector

65, 66

AC power 19 access time accessories acoustics activity indicator acti vity LE D actuator actuator assembly address air circulation air cleanliness air flow

suggested air inlet altitude altitude and atmospheric pressure ambient ambient temperature ANSI SCSI documents arbitration priority asynchronous interface transfer rate audible noise Australia/New Zealand Standard automatic retry automatic shipping lock average idle current average latency average rotational latency

9 8

7, 42

27, 42

42 28

27, 42

9, 10

background processing 7

backward compatibility bits/inch buffer buffer segment buffer-full buffer-full ratio bulkhead connector bus device reset message bytes per sector

10, 11, 12

11, 12

cabinet cooling 42 cable

55 cache cache buffer cache miss cache mode cache operation cache operation hit cache segment caching write data Canadian Department of Communications capacities capacity, drive, programmable case temperature CE Marking change definition command changeable bit changeable value check condition circuits class B limit command command descriptor block (CDB) command queuing condensation conducted noise immunity connect/disconnect connector connector contact consecutive read operation contiguous blocks of data continuous vibration controller controller overhead controlle r se lf t es t cooling C-Tick Marking current current lim it in g current profile current requirements current value cylinder boundary

10, 11, 12

10, 46

27, 28

20, 21, 22

50, 51

19, 20

daisy-chain 20, 57, 60

80 conductor data correction data transfer period data transfer protocol data transfer rate DC cable and connector DC current

78 Cheetah 18LP Product Manual, Rev. F

DC power 10, 13, 41, 55

19, 67

DC power carrying conductor

14 32, 43 13

DC power connector DC power requirements DC power source dedicated landing zone default default mode parameter default value defect/error management delayed motor start option delayed start depot repair depot repair philosophy diagnostics differential I/O circuit differentiating features dimensions disable read ahead disc access disc media disc rotational speed disconnect/reconnect

discontinuity (DISC) bit DRA bit drive drive activity drive activity LED drive capacity

drive default mode parameter drive failure drive firmware drive ID drive ID select jumper connector drive ID/option select header drive interface connector drive internal drive internal defects and errors drive malfunction drive mounting

drive orientation drive power drive primary defects list drive SCSI timing drive select header drive spindle drive transfer drive volume drive warranty dynamic spindle brake

40, 41

50, 51

control specification

programmable

constraints

ECC 13

55, 67

ECC correction capability electrical characteristics electromagnetic compatibility electromagnetic interference (EMI) electromagnetic susceptibility

embedded servo EMC com plia nce EMI requirements environment environmental control environmental interference environmental limits environmental requirements

EPROM equipment malfunction error error management system error rate error rate calculation error recovery ETF defect list European Union requirements EVPD bit execution time extended messages

fault status 13 FCC rules and regulations

51, 52

field repair firmware flat ribbon cable flaw reallocation format format command format time formatted formatting front panel front panel LED FSW function

gradient 28

ground return grounding

hard reset 50

hardware error HDA

5, 15, 27, 42, 43

temperature head and disc assembly. See HDA heat removal heat source high level format

Cheetah 1 8LP Product Manual, Re v. F 79

host 12, 35, 41, 48, 57, 60 host adapter

adapter/initiator host backplane wiring host equipment

DC power host I/O signal host system host system malfunction host/drive operational interface hot plug humidity

7, 15

27, 28

43, 58, 59

I/O connector 57 identified defect idle condition Input characteristics inquiry command inquiry vital product data installation installation guide installat ion ins t r u c ti on s instantaneous current peak integrated Ultra1/Ultra2 SCSI controller integrated Ultra160 SCSI controller interface cable length interface data interface requirements interface timing interleave internal data rate

23, 24, 25, 26

J1-auxiliary 37 jumper jumper function description jumper header jumper plug type

8, 37, 40, 41, 67

landing zone 7 LB

LED

71 logical logical block logical characteristics logical segment (mode select page 08h) low level fo r mat low voltage differential (LVD) drivers and receivers LVD LVD interface receiver circuits LVD output signals

67, 68

11, 12

magnetoresistive heads 5

55, 58, 59

10, 19, 67

10, 11, 50

50, 51

13, 43

32, 33

mating connector mating flat cable connector maximum current requirements maximum operating current maximum starting current ME jumper mean time between failure. See MTBF media media defect media defect induced error medium error message protocol message protocol syste m messages

miscellaneous features mode page 01 mode page 08h mode parameter

mode select command mode select page 08h mode sense command mode sense command page 08h mode sense data mode sense value model number table motor start command motor start delay option motor start o p tion mounting configuration mounting configuration dimensions mounting constraints mounting point mounting surface mounting surface distortion mounting surface stiffness MR heads MTBF multimode drivers and receivers multiple segment multi-segmented cache control

7, 50

SCSI interface

page 08h

13, 14, 27

noise 20

audible

non-operating

temperature non-operating vibration nonshielded 68 conductor connector

28, 29, 31

office environment 31 operating operating environment operating option operating parameter

28, 29, 31

80 Cheetah 18LP Product Manual, Rev. F

operator intervention 13 option jumper option jumper location option select header option select jumper options orientation out-of-plane deflection out-of-plane distortion Output characteristics

10, 29, 42

55 37

43 43 67

package size 29

10, 12

package test specification packaged parity parity checking parity error partition or logical drive PCB

PCBA PCBA circuit run PD jumper peak bits/inch peak starting current performance characteristics performance degradation peripheral I/O cable physical buffer space physical characteristics physical damage physical interface physically contiguous blocks of data power power connector power control switch power dissipation power distribution power sequencing power supply voltage power-carrying conductor power-on power-on operating hours power-on reset power-up power-up hours prefetch prefetch (read look-ahead) prefetch ceiling field prefetch data prefetch field prefetch hit prefetch mode prefetch of contiguous blocks prefetch operation prefetch segmented cache control

15, 40, 42

temperature

37, 43, 50, 55, 57, 60

20, 41

10, 11, 12

37, 67

20, 41

55, 56

19, 20

23, 24, 25, 26

10, 12

13, 15

preventive maintenance printed circuit board. See PCB PRML read channel electronics product data page programmable drive capacity

radio interference regulations 3 read

11, 12

13, 35 11

read command read data read error read error rate read operation read retry count read/write head ready

50 receive diagnostic results receiver circuits recommended mounting recoverable seek error reference documents regulation relative h umidity reliability reliability and service reliability specifications remote switch repair facility repair information REQ/ACK offset request sense command request sense information resonance retrieved data

S.M.A.R.T. 7, 16

safe power transmission safety saved value SCAM SCSI

SCSI bus cable SCSI bus condition SCSI bus ID SCSI bus phase sequence SCSI command SCSI I/O connector SCSI ID SCSI interface SCSI interface cable SCSI interface commands supported

50, 51

7, 37

commands format commands interface data transfer rate messages

37, 41

10, 13, 57

Cheetah 1 8LP Product Manual, Re v. F 81

SCSI interface connector 55

3, 4, 5

23, 24, 25, 26

SCSI interface data SCSI Interface Product Manual SCSI Interface Product Manual (Ultra160) SCSI systems error SCSI systems error consideration SCSI systems error management SCSI-1 mod e SCSI-2/SCSI-3 SCSI-2/SCSI-3 mode SE

67 Seagate support service sector

11 sector interleave sector size sector sizes seek error seek positioning error segment segment number self-contained Self-Monitoring Analysis and Reporting Technology.

SE-LVD alternative sense key sequential read operations service

servo data shielding shipping shipping container shock

shock mount signal ground single unit shipping pack single-ended (SE) drivers and receivers single-ended interface circuit site installation software interleave spare part spindle spindle startup standard day standards start motor command start unit command start/stop time status stop spindle stop time storage capacity straight-in connector strict bit in Mode page 00h supply voltage

See S.M.A.R .T.

life

13, 15 philosophy tools

and vibration

support services synchronous data transfer synchronous data transfer operation synchronous data transfer period synchronous transfer period system chassis system recovery procedures

technical support services 73 temperature

ambient case gradient non-operating PCB and HDA regulation

See also cooling termination terminator enable jumper TE terminator power terminator requirements TP1 position tracks/inch tracks/surfa ce , total transfer period transmitter receiver circuits typical access ti me

10, 27, 42 27

37, 69

Ultra/Ultra2 SCSI controller 7

5, 7

Ultra160 SCSI controller Ultra160 SCSI interface Ultra2 SCSI interface unformatted unrecoverable condition unrecoverable error unrecoverable seek error Unrecoverable write error

vibration 29, 31

vital product data volatile m e m o r y voltage

10, 19

warranty 7, 17

wet bulb temperature wide Ultra2 SCSI interface WP jumper wrap-around write caching write error

unrecoverable write operation

82 Cheetah 18LP Product Manual, Rev. F

write protect 41 write retry count

zoned bit recording (ZBR) 7

Seagate Tech no logy, Inc. 920 Disc Drive, Scotts Valley, California 95066-4544, USA

Publication Number: 83329400, Rev. F, Printed in USA

seagate ST318203LW, ST318203LWV, ST318203LC, ST318203LCV User 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 a n d formatted capacities

3.6 Programmable drive capacity

3.7 Factory installed accessories

3.8 Optio ns (factory insta lled)

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 [5]

4.2.2 Format command execution time (minutes) [1]

4.2.3 Generalized performance chara cteris tics

4.3 S tar t/stop ti me

4.4 Prefetch/multi-segmented cache control

4.5 Cache operation

4.5.1 Caching write data

4.5.2 Prefetch operation

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 Field failure rate vs time

5.2.3 Preventive maintenance

5.2.4 Service life

5.2.5 Servi c e philosophy

5.2.6 Service tools

5.2.7 Hot plugging Chee ta h 1 8LP di s c dri v es

5.2.8 S.M.A.R.T.

5.2.9 Product warranty

6.0 Physical/electrical specifications

6.1 AC power requirem ents

6.2 DC power requirements

6.2.1 Conducted noise immunity

6.2.2 Power sequencing

6.2.3 12 V - Current profile

6.3 Power dissipation ST318203

6.4 Environment al 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 Dri ve internal defects

7.2 Drive error recovery procedures

7.3 SCSI system s errors

8.0 Installation

8.1 Dri ve ID/optio n select heade r

8.1.1 Notes for Figures 19, 20, and 21.

8.1.2 Function description

8.2 Dri ve orientation

8.3 Cooling

8.3.1 Air flow

8.4 Dri ve moun ting

8.5 Grounding