seagate ST39173N, ST34573N, ST39173W, ST39173WD, ST39173LW Product Manual

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Barracuda 9LP Family:

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ST39173N/W/WD/LW/WC/LC

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ST34573N/W/WD/LW/WC/LC

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Product Manual, Volume 1

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Barracuda 9LP Family:

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ST39173N/W/WD/LW/WC/LC

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ST34573N/W/WD/LW/WC/LC

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Product Manual, Volume 1

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© 1997, 1998 Seagat e Technology, Inc. All rights reserved

Publication number: 77767517, Rev. C

July 1998

Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technolo gy,
Inc. Barracuda, SeaFAX, SeaFO NE, SeaBOARD, and SeaTDD are either trademarks or registered trade­marks of Seagate Tech nology, Inc. or one of its subsidiaries. All other trademarks 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 form without written permission of S eagat e Technology, Inc.

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected

Rev. A 03/04/98 D . Ashby/S. Welty 1/1, v thru viii, 1-87
Rev. B 05/22/98 D. Ashby/S. Welty 10, 11, 31, 32, 46, 49, 50, 68, 73, 77, 78,

and 79.

Rev. C 07/24/98 D. A shby/S. Welty 4, 7, 10, 11, 19, 21, 44, 46, 52, 77, and 78.

Notice.
Product Manual 77767517 is Volume 1 of a two volume document with the SCSI Interface information in

the Volume 2 SC SI Interface P roduct Manual, par t number 7773 8479.
If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered,

part number 77738479.

Barracuda 9LP Product Manual, Rev. C v

Table of Contents

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

2.0 Applicable standards and refe rence documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

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

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

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

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

3.0 General 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 capacit ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.6 Programmabl e drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.7 Factory installed accessorie s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.8 Options (factory i nstalled). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2.2 Format comm and exec ution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

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

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

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

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

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

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

5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.1 Environmental inte rference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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

5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

5.2.1 Mean time bet ween failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.2 Preve ntive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.5 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.2.6 Hot plugging Barracuda 9LP disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.7 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5.2.8 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.0 Physical/electrical specific ations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

6.2.1 Conduct ed noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.2.3 Current profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

vi Barracuda 9LP Product Manual, Rev. C

6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

6.4.5 Air clea nliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.1 Drive internal defects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.2 Drive erro r recovery proced ures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

7.3 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

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

8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

8.1.1 Notes for Figures 7a, 7b, 7c, 7d, 7e, and 7f. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

8.3.1 Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.1 General d escription. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

9.4 SCSI bus conditions and miscellaneous features supported . . . . . . . . . . . . . . . . . . . . . . . . .51

9.5 Synchronous data trans fer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.1 Synchro nous data transfer periods supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.5.2 REQ/ACK offset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.6 Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.6.1 DC cable and connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

9.6.2 SCSI interface physical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

9.6.3 SCSI interface cable requiremen ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8

9.7.1 Single-ended drivers /receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

9.7.2 Differential drivers/receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

9.8 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

10.0 Seagate Te chnology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Barracuda 9LP Product Manual, Rev. C vii

List of Figures

Figure 1. Barracuda 9LP family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Barracuda 9LP family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3a. Typical Barracuda 9LP family drive +12 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 3b. Typical Barracuda 9LP family drive +5 V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 4. Locations of PCB components listed in Table 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 5. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 6a. Mounting configuration dimensions for models “N” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 6b. Mounting configuration dimensions for models “W,” “WD,” and “LW” . . . . . . . . . . . . . . . . . . 28

Figure 6c. Mount ing configuration dimens ions for models “WC” and “LC” . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 7a. Barracuda 9LP family drive ID select header for models “N”. . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 7b. Barracuda 9LP family drive ID select for models “W,” “WC,” “WD,” “LW,” and “LC” . . . . . . . 35

Figure 7c. Barracuda 9LP family drive ID select header J5 for models “W,” “LW,” and “WD”

(J5 Pins 1A - 12A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 7d. Barracuda 9LP family drive option select header for models “N,” “W,” and “WD” . . . . . . . . . 37

Figure 7e. Barracuda 9LP family drive option select header for “WC” model . . . . . . . . . . . . . . . . . . . . . 37

Figure 7f. Barracuda 9LP family drive option select header for models “LC” and “LW”. . . . . . . . . . . . . 38

Figure 8. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 9a. Physical interface for “N” model drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3

Figure 9b. Model “W,” “WD,” and “LW” drive physical interface (68 pin J1 SCSI I/O connector) . . . . . . 54

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

DC power connector). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 10. SCSI daisy chain interface cabling for “N,” “W,” “WD,” and “LW” model drives. . . . . . . . . . . 58

Figure 11a. Nonshielded 50 pin SCSI device connector used on “N” models. . . . . . . . . . . . . . . . . . . . . . 59

Figure 11b. Nonshielded 68 pin SCSI device connector used on “W,” “WD,” and “LW” models. . . . . . . . 59

Figure 11c. Nonshielded 80 pin SCSI “SCA-2” connector, used on “WC” and “LC” models . . . . . . . . . . . 60

Figure 12. Single-ended transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 13. HVD output signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 14. Typical high-voltage differential I/O line transmitter/receiver and external terminators . . . . . 70

Figure 15. LVD output signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 16. Typical SE-LVD alternative transmitter receiver circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Barracuda 9LP Product Manual, Rev. C 1

1.0 Scope

This manual describes the Seagate Technology®, Inc. Barracuda 9LP™ disc drives.
Barracuda 9LP drives suppor t the small computer system interface (SCSI) as descr ibed in the ANSI SCSI,

SCSI-2, and SCSI-3 (Fast-20 and Fast-40) interface specifications to the extent described in this manual. The

SCSI Interface Product Manual

this and other families of Seagate drives.
From this point on in this product manual the reference to Barracuda 9LP models is referred to as “the drive”

(unless references to individual models are necessary).

(part num ber 77738479) descr ibes general SCSI interface characteristics of

*

*Model “N” version with 50 pin SCSI I/O connector

Figure 1. Barracuda 9LP famil y drive

Barracuda 9LP Product Manual, Rev. C 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 adeq uate power and environment in order to a chieve 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 par ticular, the drive must be securely m ount ed in o rder to guarante e th e spec ified pe rformanc e char­acteristics. Mounting by bottom holes must meet the requirements of Section 8.4.

2.1 Standards

The Barracuda 9LP family complies with Seagate stand ards as noted in the appropr iate sections of this Man­ual and the Seagate

The Barracuda 9LP disc dr ive is a UL recognized component per UL1950, CSA cer tified to C AN/CSA C22.2
No. 950-95, and VDE certified to VDE 0805 and EN60950.

2.1.1 Electromagnetic compatibility

The drive, as delivered, is designed f or s ystem integr ation and installation into a suitable enclosure prior to use.
As such the drive is supplied as a subassembly and is not subjec t to Subpart 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 do es not provide adeq uate shielding. If the I /O cables are extern al to
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con­troller.

SCSI Interface Product Manual

, part number 77738479 (Vol. 2).

2.1.2 Electromagnetic susceptibility

As a component assem bly, the drive is not required to me et any suscep tibility perform ance requi rements. It is
the responsibility of those integrating the dri ve within their systems to perform t hose t ests req uired a nd des i gn
their system to ensure that equipm ent operating in the same system as the drive or external to the system
does not adversely affect the perf ormance of the drive. S ee Section 5.1.1 and Table 2, DC power requirements.

2.2 Electromagnetic compliance

Seagate uses an independen t laboratory to confirm com pliance 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 pli es to the direct ives/standard(s), we cannot guarantee

that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compli ance
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 Electromagnet ic
Compatibility Directive 89/336/EEC of 03 M ay 198 9 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.

4 Barracuda 9LP Product Manual, Rev. C

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 Aust ral ia’s Spectrum Man­agement Agency (SMA).

2.3 Reference documents

Barracuda 9LP Installation Guide
SCSI Interface Product Manual

ANSI small computer system interface (SCSI) document numbers:

X3.131-1994 SCSI-2
X3T10/855D SPI
X3T10/1071D Fast-20 (also called “Ultra SCSI”)
X3T10/1142D SPI-2

X3T10/1143D
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.

Seagate P/N 77767518
Seagate P/N 77738479

Barracuda 9LP Product Manual, Rev. C 5

3.0 General description

Barracuda 9LP drives combine magnetoresistive (MR) heads, partial response/maximum likelihood (PRML)
read channel electronics, embedded servo technology, and a SCSI-3 (Fast -20 and Fast-40) interface to provide
high performance, high capacity dat a storage for a variety o f systems includi ng e nginee rin g work st ations, net­work servers, mainframes, and supercomputers.

Fast-20 and F ast-40 (also known as Ultra-1 SCSI and Ultra-2 SCSI, respectively) are negotiated transfer rates .
These tran sfer rat es w ill oc c u r o nly if you r h os t ad apter also sup p orts thes e data transfer rate s. Th is dr i ve als o
operates at SCSI-1 and SCS I-2 data transfer rates for backward compatibility with non-Fast-20/Fast-40 capa­ble SCSI host adapters.

Table 1 lists the features that differentiate the various Barracuda 9LP models.

Table 1: Drive model number vs. differentiating features

Model number

Number
of heads I/O circuit type [1]

Number of I/O
connector pins

ST39173N 10 single-ended 50 8
ST39173W 10 single-ended 68 16
ST39173WD 10 differential (HVD) 68 16
ST39173LW 10 differential (LV D) 68 16
ST39173WC 10 single-ended 80 16
ST39173LC 10 differential (LV D) 80 16
ST34573N 5 single-ended 50 8
ST34573W 5 single-ended 68 16
ST34573WD 5 differential (HVD) 68 16
ST34573LW 5 differential (LVD) 68 16
ST34573WC 5 single-ended 80 16
ST34573LC 5 differential (LVD) 80 16

[1] See Section 9.6 for details and definitions.

Number of I/O
data bus bits

The drive records and recovers data on 3.5-inch (86 mm) non-removeable discs.
The drive supports the Small Computer System Interface (SCSI) as describe d in the ANSI SCSI-2/SCSI-3

SPI-2 interface specifications to the extent described in this manual (volume 1), which defines the product per­formance characteristics of the Barracuda 9LP family of drives, and the

SCSI Interface Product Manual

(vol­ume 2), part number 77738479, which descr ibe s the general interface characteristics of this and other families
of Seagate SCSI 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 a nd do not attempt to ser vice 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.

6 Barracuda 9LP Product Manual, Rev. C

Barracuda 9LP drives use a ded icated landi ng zone at th e inner m os t radius of the me dia to eli minat e the pos ­sibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the landing
zone when power is removed.

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

Barracuda 9LP drives decode track 0 location data from the servo data embedded on each surface to eliminate
mechanical transducer adjustments and related reliabilit y concer ns.

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

Figure 2. Barracuda 9LP famil y drive

Barracuda 9LP Product Manual, Rev. C 7

3.1 Standard features

The Barracuda 9LP family has the following standard features:

• Integrated SCSI controller

• Single-ended or high voltage differential SCSI drivers and receivers, or low voltage differential drivers and

receivers (“LC” and “LW” models only)

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

• Asynchronous and synchronous data transfer protocol

• Firmware downloadable via SCSI interface

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

• Programmable drive capacity

• Programmable sector reallocation scheme

• Flawed sector reallocation at format time

• Programmable auto write and read reallocation

• Reallocation of defects on command (post format)

• Enhanced ECC correction capability up to 185 bits

• Sealed head and disc assembly

• No preventative maintenance or adjustment required

• Dedicated laser textured head landing zone

• Embedded servo data rather than a separate servo data surface

• Self diagnostics performed when power is applied to the drive

• 1:1 Interl eave

• Zoned bit recording (ZBR)

• Vertical, horizontal, or top down mounting

• Dynamic spindle brake

• Active IC terminators enabled by jumpers (“N” and “W” models only)

• 512 Kbyte data buffer or 2 Mbyte optional; “LW” and “LC” model drives have 1 Mbyte, or optional 4 Mbyte

data buffer

• Hot plug compatibility (section 9.6.4.3 lists proper host connector needed) for “WC” and “LC” model drives

• SCAM (SCSI Configured AutoMagically) plug-n-play level 2 compliant, factory set to level 1 (not user select-

able)

• Low audible noise for office environment

• Low power consumption

3.2 Media characteristics

The media used on t he drive has a diameter of approximately 3.5 inches (86 m m ). The alum inum substrate is
coated with a thin film magnetic material, overcoated with a proprietar y protec tive layer for i mproved durability
and environmental protection.

3.3 Performance

• Supports indus try standard Fast-20 and Fast-40 (“LC” and “LW” d rives only) SCSI interfaces (also called

“Ultra-1 SCSI” and “Ultra-2 SCSI,” respectively)

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

• 7200 RPM spindle. Average latency = 4.17 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-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)

8 Barracuda 9LP Product Manual, Rev. C

• Incorporates Seek To Improve Reliability algorithm (STIR)

• 5-year warranty

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 O EM model read capacities data. Total L BAs = read capac ity
data shown below +1.

Formatted data block size
512 bytes/sector [1]

ST39173 10F59C7h (9,105 GB) [2]
ST34573 87A25Bh (4,551 GB) [2]

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 than those listed. See
Mode Select Command and Format Command in the

SCSI Interface Product Manual

, part number

77738479.

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

sparing zone and the num ber of alternat e sectors (LBAs) p er sparing zone can be determined by using
the Mode Sense command and reading Mode Page 03h. Total LBAs(h) x 200(h) = total byte capacity.

3.6 Programmable drive capacity

Using the Mode Select command, the drive can change its capacity to something less than maximum. See
Table 5.2.1-13 in the

SCSI Interface Product Manual

, part number 77738479 . Refer to the Parameter list block
descriptor number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not
change the capacity it is currently formatted to have. A number in the number of blocks field that is less than
the maximum number o f LBAs chan ges the tot al drive capacity to t he value in the block de scriptor num ber of
blocks field. A va lue greater than the maximum number of LBAs is rounded down to the maximum capacity.

3.7 Factory installed accessories

OEM Standard drives a re shipped with the

Barracuda 9LP Inst allation Guide

, part number 77767518 (unless
otherwise specified). The factory also ships with the drive a small bag of jumper plugs used for the J2, J5, and
J6 option select jumper headers.

3.8 Options (factory installed)

All customer reques ted options are inco rporated during prod uction or packaged at the manufactur ing 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.

• 2 Mbyte optional buffe r size for “N,” “W,” “WD,” and “WC” models.

• 4 Mbyte optional buffe r size for “LC” and “LW” models.

• Single unit shipping pack. T he drive is n ormally ship ped in bulk packaging to provide m aximum protecti on

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

•The

Barracuda 9LP Installation Guide

, part number 77767518, is included 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.

Barracuda 9LP Product Manual, Rev. C 9

4.0 Performance characteristics

4.1 Internal drive characteristics (transparent to user)

ST39173 ST34573

Drive capacity 9,100 4,550 GByte (formatted, rounded off values)
Read/write he ads 10 5
Bytes/track 155,000 155,000 Bytes (average, unformatted, rounded off values)
Bytes/surface 1,165 1,165 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 7,501 7,501 Tracks (user accessible)
Tracks/inch 8,250 8,250 TPI
Peak bits/inch 180 180 KBPI
Internal data rate 120-190 120-190 Mbits/sec (variable with zone)
Disc rotational speed 7,200 7,200 r/min
Average rotational latency 4.17 4.17 msec
Recording code 16/17 16/17 EPR4

4.2 SCSI performance characteristics (visible to user)*

The values given in Section 4.2.1 apply to all models of the B arracuda 9LP family unless otherwise s pecified.
Refer to Section 9.10 and to the
details.

SCSI Interface Product Manual

, part number 77738 479, for additional timing

4.2.1 Access time [8]

Including controller overhead
(without disconnect) [1] [4]

Driv e l e ve l

Read Write

msec
Averag e – Typical [3] 7.4 8.2
Single Track – Typical [3] 1.1 1.4
Full Stroke – Typical [3] 16 18

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

ST39173 ST34573

Maxim um (wit h verify) 40 25
Maximum (no verify) 20 13

4.2.3 Generalized performa nce chara cterist ics

Minimum sector interleave 1 to 1

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

Min. [4]*
Avg. [4]
Max. [4]

15.2

20.4

23.7

MByte/sec
MByte/sec
MByte/sec

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

Min. [4]
Avg. [4]
Max. [4]

MByte/sec divided by (interleave factor)

10.8
MByte/sec divided by (interleave factor)

16.0
MByte/sec divided by (interleave factor)

17.0

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

10 Barracuda 9LP Product Manual, Rev. C

SCSI interface data transfer rate (asynchronous) [5]:

Maximum instantaneous 6.0 Mbytes/sec [6]
Maximum average 6.0 Mbytes/sec [7]

Synchronous transfer rate for SCSI Fast-20 (Ultra-1 SCSI):

8 bit data bus models 20 Mbytes/sec
16 bit data bus models 40 Mbytes/sec

Synchronous transfer rate for SCSI Fast-40 (Ultra-2 SCSI):

8 bit data bus models 40 Mbytes/sec
16 bit data bus models 80 Mbytes/sec

Synchronous transfer rate for fast SCSI-2:

8 bit data bus models 1.25 to 10 Mbytes/sec

Synchronous transfer rate for fast SCSI-2:

16 bit data bus models 2.5 to 20 Mbytes/sec

Sector Sizes:

Default 512 byte user data blocks
Variable 180 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 region reallocation scheme.)
Overhead time for head switch (512 byte sectors) in sequential mode 1.2 msec

Overhead time for one track cy linder switch in sequential mode 1.2 msec (typical)
Average rotational latency 4.17 msec

Notes for Section 4.2.

[1] Execution time measured from receipt of the last By te of the Command Descriptor Block (CDB) to the

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

[2] Maximum times are specified over the worst case conditions of temperatu re, voltage margins and dr ive

orientation. When comparing spec ified access times, care should be taken to distinguish between typical
access times and maximum access times. The best comparison is obtained by system benchmark tests
conducted under identical conditions. Maximum times do not include error recovery.

[3] Typical Access times are measured under nomin al conditions of temperature, voltage, and horizontal ori-

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

Access to data = controller overhead + avera ge seek time + latency time

4.3 S tart/stop time

After DC power at nominal voltage has been applied, the drive typically becomes ready within 30 seconds if the
Motor Start Opt ion is disabled, such as the m otor start s as soon as th e power has been applied. If a recover­able error condition is detected during the star t sequ ence, the drive executes a recovery procedure which may
cause the time to become ready to exceed 30 seconds, but to become ready within 50 seconds. During spin up
to ready time, the drive responds to some commands over the SCSI interface in less than 1.5 seconds after
application of power. The supported commands include the Test Unit Ready command which can be used to

Barracuda 9LP Product Manual, Rev. C 11

provide information indicating the status of the spin up, such as the drive is still in process of coming ready or
the drive requires intervention (see
than 20 seconds from removal of DC power.

SCSI Interface Product Manual

, part number 77738479). Stop time is less

If the Motor Start Opt ion is enabled, the internal cont roller accepts the comm ands listed in the

Product Manual

been received the drive becomes ready for normal operations within 13 seconds typical ly (excluding an error
recovery procedure). The M otor Star t Command can also be used to command t he drive to stop the spindle

SCSI Interface Product Manual

(see
There is no power control switch on the drive.

4.4 Prefetch/multi-segmented cache control

The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many
cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when
it is used in “cache” operat ions. To select pre fetch and cache features the host s ends the Mode S elect com­mand with the proper values in the a pplicable bytes in Mode Page 08h (see
part number 77738479). Prefetch and cache operation are independent features from the standpoint that each
is enabled and disabled independently via the Mode Select command. However, in actual operation the
prefetch feature overlaps cache operation somewhat as is noted in Section 4.5.1 and 4.5.2.

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

4.5 Cache operation

In general, all but 100 Kbytes of the physical buffer space in the drive can be used as storage space for cache
operations. The buffer ca n be divided into logical segments (Mode Select Page 08h, byte 13) from which data
is read and to which dat a is written. The dr ive maintains a t able of lo gical block disk medium addresses of the
data stored in each segment of the buff er. If cache operation is enabled (RCD bit = 0 in Mode Page 08h, byte 2,
bit 0, see
command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not
enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer
segments during disc medium read 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 data merely passes through some buffer segment on the way to the host. On a c ache
“miss”, all data transfers to the host are in accordance with “buffer-full” ratio rules. On a cache “hit” the drive
ignores the “buffer-full” ratio rules. See explanations associated with Mode page 02h (disconnect/reconnect
control) in the

less than 3 seconds after DC power has been applied. After the Motor Start Command has

, part number 77738479).

SCSI Interface Product Manual,

SCSI Interface Product Manual,

SCSI Interface Product Manual

par t number 77738479), data requested by the host with a Re ad

.

SCSI Interface

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 LB’s that are already in
the cache. This data may be in multiple segments.

2. When a 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 hos t in accordance with the disc onnect /recon nect specifica tion m en­tioned above.

3. If the prefetch feature 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 LB’s from the disc and transfers them into a segment, and fro m there to
the host in accordance with the disconnect/reconnect specification referred to in case A.

2. If the prefetch feature 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 ov erall performance as a cache storage, allowing a wide range of user selectable config­urations, which includes their use in the prefetch operation (if enabled), even when cache operation is disabled

12 Barracuda 9LP Product Manual, Rev. C

(see Section 4.5.2). The number of segm ents may be selected using the Mode Select com mand, but the size
can not be directly selected. Size is s el ected on ly as a by-product of s ele cting the segment number spec ifica­tion. 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 segm ent s ize is set up by the drive, and if the “ST RICT” bit in M ode page 00h (byte
2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see

SCSI Interface Product Manual,

of segments from 1 to 16.

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 dat a 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), t hen dat a written to the medium is retained in the cache to be made avail­able for future read cache hi ts. The s am e buffer space and segmentation is used as set up for read functions.
The buffer segmentation scheme is set up or changed indep endently, having nothing to do with the state of
RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that
are to be written are already stored in the cache from a previous read or write command. If there are, the
respective cache segments are cleared. The new data is cached for subs equen t Read command s.

If the number of write dat a logical blocks exceeds the size of the segment being wr itten 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. Howev er, the drive does not overwrite data that has not
yet been written to the medium.

part number 77738479). The drive supports operation of any integer number

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
while writing the dat a to the medium, and G OOD status has already bee n 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. The Start/Stop co mmand with the stop bit set will force a sync cache operation
before the drive stops.

Tables 9a and 9b show Mode default settings for the drives.

4.5.2 Prefetch operation

If the Prefetch feature is enabled, data in contiguous logical blocks on the disc i mm edi ately 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 comm and s that request those logical blocks (this is true 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 prefet ched
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 am ount of prefetch. The drive does not
use the prefetch “ceiling” field ( byte s 10 and 11).

During a prefetch operation, the drive crosses a cylinder bo undary to fetch more data only if the Di scontinuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.

Whenever prefetc h (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, A RLA enables prefetch of contiguous blocks
from the disc when it senses t hat a prefetch “hit” w ill l ikely occu r, even if two consecutive read operations were
not for phy sically contiguous bloc ks of data (e .g. “software interleav e”). ARLA disables prefetch when it decides
that a prefetch “hit ” w ill not likely o ccur. If the h ost is not using software int er leave, and if two sequenti al re ad
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.

Barracuda 9LP Product Manual, Rev. C 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 M aintenance Non e 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 def ined in this manual (see Section 6.2).

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

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

8

seeks

12

bits transferred (OEM default settings)

15

bits transferred (OEM defa ult settings)

21

bits tran sferred

5.1.1 Environmental interference

When evaluating syste ms operation under conditions of Electromagnetic Interference (EMI), th e performance
of the drive within the system shall be considered acc eptable if the drive does not g enerate 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 interven­tion.

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 writ e 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).

14 Barracuda 9LP Product Manual, Rev. C

5.1.4 Seek errors

A seek error is defined as a failure of the drive to position the heads to the address ed track. There s hal l be no
more than ten recoverable seek errors in 10

8

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) rep orted in the Sense Key. This is an
unrecoverable seek error. Unrecoverable seek errors are classified as failures for MTBF calculations. Refer to
Section 5.1.1.2 of the

SCSI Interface Product Manual,

part number 77738479, for Request Sense information.

5.2 Reliability and service

You can enhance the reliability of Barracuda 9LP disc drives by ensuring that the drive receives adequate cool­ing. Section 6.0 provides tem perature measurem ents and other i nformation that may be used t o enhance t he
service life of the drive. Section 8.3.1 provides recommended 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, Table 3, Colum n 2 are not exc eeded. Short-term
excursions up to the specification limits of the operating environment will not affect MTBF performance. Contin­ual or sustained operation at case temperatures above the values shown in Table 3, Column 2 may degrade
product reliability.

The following expression defines MTBF

Estimated power-on operating hours in the 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 perio d of six months.

Drive failure means any s t oppag e or substandard perform ance caus ed by drive malfunction.

5.2.2 Preventive maintenance

No routine scheduled preventive maintenance shall be required.

5.2.3 Service life

The drive shall have a usef ul service life of five years. Depo t repair or replacement of major parts is permitt ed
during the lifetime (see Section 5.2.4).

5.2.4 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 properly equipped and st affed service and repai r facility. Troubleshooting and repair of
PCBs in the field is not rec ommended, because of the extensive diagnost ic equipment required for effective
servicing. Also, there are no spare parts available for this drive. Drive warranty is vo ided if the HDA is opened.

5.2.5 Service tools

No special tools are required for site installation or recommended for site maintenance. Refer to Section 5.2.4.
The depot repair philosophy of the drive precludes the necessity for special tools. Field repair of the drive is not
practical since there are no user purchasable parts in the drive.

Barracuda 9LP Product Manual, Rev. C 15

5.2.6 Hot plugging Barracuda 9LP disc drives

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 A ll bus devices powered off during removal or insertion
Case 2 RST signal asser ted continuousl y during rem oval or insertion
Case 3 Current I/O processes not allowed during insertion or removal
Case 4 Current I/O process allowed during insertio n or removal, except on the device being changed

Seagate Barracuda disc drives support four hot plugging cases. Provision shall be made by the system such
that a device being inserted makes power and ground connections prior to the connection of any device signal
contact to the bus. A device being removed shall maintain power and ground connections af ter the disc onnec­tion 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 inser ted or removed shall be quiesce nt. All SCSI 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) mod e, then a ll I /O processes for all devices on the bus must be co mplete d, and the bus q ui­esced, before attempting to hot plug. Following the insertion of the newly installed device, the SCSI host
adapter must issue a B us Rese t, 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 pri or to completely removing 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, "Sh ock and vibration," o f this man­ual.

5.2.7 S.M.A . R . T.

S.M.A.R.T. is an acronym for Self-Monitoring Ana lysis and Repor ting Techn ology. This tec hnology 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 an 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 spec ific s et of failure conditions in th e operat ing pe rformanc e of
the drive, and the thresholds are optimized to minimize “false” and “fa iled” predictions.

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

The operating mode of S.M.A.R.T. is controlled by the DE XCPT bit and the PERF bit of the “Informational
Exceptions Control Mode Page” (1Ch). The DEXCPT bit i s used to e nable or disable the S.M.A.R.T. process.
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data
as the drive performs 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 meas uring off-line attri butes and saving data can be forced by the RTZ (return to zero) com­mand. Forcing S.M.A.R.T. will res et the timer so that the next scheduled interrupt will be two hours.

16 Barracuda 9LP Product Manual, Rev. C

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 RTZ command will reset the timer.

Performance impact

S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predic­tive failure. The drive will measure and save parameters once every two hours subject 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-line only delay Fully enabled delay
DEXCPT = 0, PERF = 1 DEXCPT = 0, PERF = 0

S.M.A.R.T. delay times 30 milliseconds 200 millisecond s

Repor tin g c on t rol

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

Determining rate

S.M.A.R.T. monitors the rate at which errors occur and s ig nals a predictive failure if the rate of degraded error
rate increases to an unacceptable level. To determ ine rate, error events are logged and compared 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 Inter val
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 t he num ber 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 to record rates of
error is to set thresholds for t he number of errors and the interval. If the number of errors exceeds the threshold
before the interval expires, then the error rate is considered to be unacceptable. If th e 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 starts over.

Predictive failures

S.M.A.R.T. signals predictive failures when the drive is p erforming unac cept ably for a period of tim e. The firm ­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 unac ceptable 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.

5.2.8 P roduct 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 Sea gate’s option and at no charge to customer, if returned by customer at cus­tomer’s expense to Seagate’s designated facility in accordance with Sea gate’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 conditions of Purchase for Seagate products.

Barracuda 9LP Product Manual, Rev. C 17

Shipping

When transpor ting or shipping a drive, a Seagate approved container must be us ed. Keep your original box.
They are easily identified by the Seagate App roved Package labe l. Shipping a drive in a non-approved con­tainer voids the drive warranty .

Seagate repair centers may refuse recei pt of components improperly packaged or obviously dam aged in tran­sit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends shipping
by an air-ride carrier experienced in handling computer equipment.

Product repair and return information

Seagate customer service cent ers are the only facil ities 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.

Barracuda 9LP Product Manual, Rev. C 19

6.0 Physical/electrical specifications

This section provides information rela ting to the physical and electrical characteristics of the Barracuda 9LP
drive.

6.1 AC power requirements

None.

6.2 DC power requirements

The voltage and current requirements for a single drive are shown in the following table. V al ues indicated apply
at the drive power connector. The single ended power requirements includes the internal disc drive SCSI I/O
termination. The table shows current values in Amperes.

T able 2: DC power requirements

ST39173 ST34573
N/W/WC

Notes

Single­ended

WD
Differential

LC/LW
LVD

Vol tage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V
Regulation [5][2] ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5% ±5%
Maximum operating

current DC [1] 1.15 .95 1.23 .95 1.4 .95 1.15 .95 1.23 .95 1.4 .95
Average idle current

DCX

[1] .75 .5 .78 .5 .75 .5 .75 .5 .78 .5 .75 .5

Maximum start ing
current

(peak DC)
(peak AC)

[3]
[3]

1.2 1.7

2.9

1.23 1.7

2.9

1.2 1.7

2.9

Delayed motor start
(max) DC [1][4] .65 .06 .67 .06 .65 .06 .65 .06 .67 .06 .65 .06

Peak operating
current

[1][6]

1.05

Typical DCX
Maximum DC
Maximum (Peak)

[1]

1.15

1.7

.9
.95

2.4

1.16

1.23

2.00

.9
.95

2.4

1.2

1.4

1.7

.9
.95

2.4

N/W/WC
Single­ended

1.2 1.7

2.9

1.05

.9

1.15

.95

1.7

2.4

WD
Differential

1.23 1.7

2.9

1.16

.9

1.23

.95

2.00

2.4

LC/LW
LVD

1.2 1.7

2.9

1.2

.9

1.4

.95

1.7

2.4

[1] Measured with average reading DC ammeter. Instantaneous +12 V current peaks will exceed these val-

ues.

[2] For +12 V, a –10% droop is permissible during initial start of spindle, and must return to ±5% before 7,200

rpm is rea ched. The ±5% must be maintained a fter 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 3a.
[4] This condition occurs when the Motor Sta rt Option is enabled and the drive has not yet received a Start

Motor co mmand.
[5] See Section 6.2.1 “Co nducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,

and transient response.
[6] Operating condition is defined as random seek read operations with a block count of 64.

General Notes from Table 2:

1. Minimum current loading for each supply voltage is not less than 4% of the maximum operating current

shown.

2. T he +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.

20 Barracuda 9LP Product Manual, Rev. C

6.2.1 C ondu cted 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 50 kHz and 100 mV pp from 50 kHz to 10 MHz.

+12 V = 150 mV pp from 0 to 50 kHz and 100 mV pp from 50 kHz to 10 MHz.

6.2.2 Power sequencing

The drive does not req uire power sequencing. T he dr ive protects against ina dvertent wr iting duri ng power-up
and down. Daisy-chain operation requ ires that power be mainta ined on the ter minat ed drive to ensure p roper
termination of the peripheral I/O c ables. To automatically del ay motor start based on t he target ID (SCSI I D)
enable the Delay Motor Start option and disable the Enable Motor Star t option on the J2 conne ctor. See Sec­tion 8.1 for pin selection info rmation. To delay the motor until the drive receives a S tar t Unit command, enable
the Enable Motor Start option on the J2 connector.

6.2.3 Curr ent profil e

Figures 3a and 3b identify the drive +5 V and +12 V current profile. The current during the various times is as
shown:

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

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

Note. A ll times and currents are typical. See Table 2 for maximum current requirements.

4.0
T3

T4

8 18 2422

TIME (seconds)

+12V

Current

(amps)

T

3.5

3.0

2.5

2.0

1.5

1.0

0.0

T1

0.0 2 4 6 10 12 14 16 20

T2

AC

Component

Nominal (average) DC curve

T5

Figure 3a. Typical Barracuda 9LP family drive +12 V current profile

Barracuda 9LP Product Manual, Rev. C 21

1.4
T5

1.2

1.0

0.8

0.6

T

T1

T2

T3

T4

+5V

Current

(amps)

Figure 3b. Typical Barracuda 9LP family dri ve +5 V current profile

0.4

0.2

0.0

0.0 2 4 6 10 12 14 16 20

8 18 2422

TIME (seconds)

6.3 Power dissipation

For drives with single ended interface circuits, typical operating random read p ower dissipation is 16. 05 watts
(54.8 BTUs per hour) of DC power aver age at nominal v oltages. Typical power dissipation under idle conditions
is 9.75 watts (33.3 BTUs per hour).

For drives with h igh voltage differential interface circuits (HVD), typical operating random read power dissipa­tion is 16.91 watts (57.8 BTUs per hour) of DC power average at nominal voltages. Typical power dissipation
under idle conditions is 9.80 watts (33.5 BTUs per hour).

For drives with low voltage differential interface circuits (LVD), typical operating random read power dissipation
is 16.8 watts (57.3 BTUs per hour) of DC power average at nominal voltages. Ty pical power dissipation under
idle conditions is 9.75 watts (33.3 BTUs per hour).

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 pres sure 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 maintain the case tem peratures of Table 3, Column 2, the dri ve meets all specifi­cations over a 41°F to 122 °F (5° C to 50°C) drive ambient temperatu re range wit h a m ax imum temperature
gradient of 36°F (20°C) per hour. The enclosure for the drive should be designed such tha t the tempera­tures at the locations specified in Ta ble 3, column 1 a re not exceeded. A ir flow may be need ed to achieve
these temperature values (see Section 8.3 and 8.3.1). Operation at case tem peratures [4] a bove 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 th at the case
temperatures specified in Table 3, column 2 are not exceeded. Occasional excursions to drive ambient tem-

22 Barracuda 9LP Product Manual, Rev. C

peratures 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 sustaine d operation at case tem­peratures above these values may degrade MTBF.

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

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

T able 3: PCB and HDA temperatures

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

Items in
Figure 4

Column 1
Maximum case [4]
temperatures (°C)
operating (50° ambient ) [2 ]

HDA [3] 60 45
U2 95 75
U5 82 [7], 82 [6] 62 [7], 62 [6]
U11 82 62
U15 94 74
XCVRs [5] TBD TBD

Note.

[1] Section 8.3.1 describes the air-flow patterns to be used to meet case temperatures in column 2. Air

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

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

cooling air may be required to ensure that these values are not exceeded.
[3] Measure HDA temp at point labeled “HDA” on Figure 4.
[4] PCB mounted integrated circuit case.
[5] Model WD I/O transceivers
[6] Ultra SC SI
[7] Ultra2 SCSI

b. Non-operating

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

Barracuda 9LP Product Manual, Rev. C 23

Model “WC/LC” PCB [1]

U8

HDA Temp.

Check Point

U15

.5"

Model “N” PCB [1]

U8

U15

U11

U16

U18

U19

J1

J4

U2

U4

U5

PCB 3

Model “W/WD/LW” PCB [1]

U8

J4

U15

J4

U11

U16

U18

U19

U2

U4

U5

J1

PCB 1

[1] Bottom side of PCB
[2] Applies only on “WD” model

Figure 4. Locations of PCB components listed in Table 3

U11

U16

U18

U19

XCVRXCVRXCVR

[2] [2] [2]

J1

PCB 2

U2

U4

U5

24 Barracuda 9LP Product Manual, Rev. C

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)

6.4.4 Shock and vibration

Shock and vibration limits speci fied in this doc um ent are measured directly on t he d rive ch assis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criter ia is applied, 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 5 , and in accordanc e with the restrictions of Section 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 Gs at a maximum duration of 11 msec (half sinewave). Shock may be applied in the X, Y, or Z
axis.

b. Operating—abnor m al

Equipment, as installed for nor mal operation, does not incur physical damage while subjected to interm it­tent shock not exceeding 10 Gs at a max imum duration of 11 msec (half sinewave). Shock occurring at
abnormal levels may promote degraded operational performance during the abnormal shock period. Speci­fied operational performance will continue when normal operating shock levels resume. Shock may be
applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.

c. Non-operating

The limits of non-operating shock 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 o r performance d egradation. Shock may be applie d in the X , Y,
or Z axis.

The drive subjected to nonrepetitive shock not exceeding 135 Gs at a maximum duration of 2 msec (half
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,
or Z axis.

Barracuda 9LP Product Manual, Rev. C 25

d. Packaged

Disc drives shipped as loose load (not p alletized) general freight will be packaged to w ithstand drops 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 Packa ged/product weight Dr op 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)

Z

Y
X

Figure 5. Recommended mounting

X

Z

Y

26 Barracuda 9LP Product Manual, Rev. C

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

5-350 Hz @ 0.5 G
Vibration may be applied in the X, Y, or Z axis.

b. Operating - abnormal

5-350 Hz @ 0.75 G (X, Y, or Z axis)

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
exceedi n g

5-22 Hz @ 0.081 inches (2.05 mm) displacement

22-350 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 4.2 bels typical when measured to Seagate’s 30553-001 specification.

6.4.7 Electromagnetic susceptibility

See Section 2.1.2.

Barracuda 9LP Product Manual, Rev. C 27

6.5 Mechanical specifications

The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimen sions
of the front panel are shown in figure below. Refer to Figures 6a, 6b, and 6c 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 0.589 kilograms

[3]

C

G

K

H

[2]

M [6]

[6] N

S [8]

[1]

E

B

J

J2

J6 LED

P [5]

R

D

F

A

Notes:

[1]

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

0.12 in. (3.05 mm).

[2]

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

[3]

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

[4]

Centerline of pad for Pin 1 of power connector.

[5]

Centerline of pad for Pin 1 of J6.

[4] L

[6]

Centerline of pad for Pin 1 of J2. Dimensions indicated are for
reference only.

[7]

Dimensions to Pin 1 of each connector are nominal values.

[8]

To pin ends on J6. Pin ends on J6 are nominally flush with
end of drive.

Dimension Table

Inches

A

5.75

4.00

1.002

2.362

1.120

4.000
.250

1.750

3.750

1.625
.143
.753
.165
.405

2.265

2.350

± .025
± .015

+ .027

– .21

± .010
± .020
± .010

+ .010
– .005

± .010
± .010
± .020

[7] [7]

B
C

D
E
F
G

H

J
K
L
M
N
P
R
S

Millimeters

146.05

101.60

25.45

60.00

28.45

101.60

6.35

44.45

95.25

41.28

3.63

19.13

4.19

10.29

52.53

59.69

± .64
± .38

+ .69

– .53

± .25
± .51
± .25

+ .25
– .12

± .25
± .25
± .51

Figure 6a. Mounting configuration dimensi ons for models “N”

28 Barracuda 9LP Product Manual, Rev. C

[3]

C

G

K

H

[2]

M [6]

[6] N

S [8]

[1]
E

B

J

J2

J6 LED

P [5]

R

D

F

A

Notes:

[1]

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

0.12 in. (3.05 mm).

[2]

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

[3]

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

[4]

Centerline of pad for Pin 1 of power connector.

[5]

Centerline of pad for Pin 1 of J6.

[4] L

[6]

Centerline of pad for Pin 1 of J2. Dimensions indicated are for
reference only.

[7]

Dimensions to Pin 1 of each connector are nominal values.

[8]

To pin ends on J6. Pin ends on J6 are nominally
flush with end of drive.

Dimension Table

Inches

A

5.75

4.00

1.002

2.362

1.120

4.000
.250

1.750

3.750

1.625
.143
.753
.165
.405

2.265

2.350

± .025
± .015

+ .027

– .21

± .010
± .020
± .010

+ .010

– .005

± .010
± .010
± .020

[7] [7]

B
C

D
E

F

G
H

J

K

L
M
N
P
R
S

Millimeters

146.05

101.60

25.45

60.00

28.45

101.60

6.35

44.45

95.25

41.28

3.63

19.13

4.19

10.29

52.53

59.69

± .64
± .25

+ .69

– .53

± .25
± .51
± .25

+ .25
– .12

± .25
± .25
± .51

Figure 6b. Mounting configuration dimensions for models “W,” “WD,” and “LW”

Barracuda 9LP Product Manual, Rev. C 29

[3]

C

G

[7]

L

Pin 1

Connector Centerline

XN

M [5]

[2]

U [9]

J2

[9] T

H

S [11]

K

[1]
E

[4]

B

[7]

X

J

J6 LED

P [8]

R

D

F

A

Notes:

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

[1]

into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0
in-lb (.675 NM) max with minimum thread engagement of 0.12 in.
(3.05 mm).

Mounting holes four on bottom, 6-32 UNC. Max screw length into

[2]

bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0
in-lb (.675 NM) max with minimum thread engagement of 0.12 in.
(3.05 mm).

Interface connector is flush with the end of drive within

[3]

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

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

[4]

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

[5]

to the face of the connector at the center of the drive.
Dimensions “M” and “N” are unique requirements for SCA drives

[6]

only, required for conformance with latest SFF Spec #8337.
Maximum connector non-perpendicularity to side planes pointed

[7]

to by X.
Centerline of pad for Pin 1 of J6.

[8]

Centerline of pad for Pin 1 of J2. Dimensions indicated are for

[9]

reference only.
Dimensions to Pin 1 of each connector are nominal values.

[10]

To pin ends on J6. Pin ends on J6 are nominally flush with end of

[11]

drive. Dimensions “K” and “S” may not be exactly the same.

Dimension Table

[6]
[7]

Inches

A

5.75

B

C
D

E
F

G

H

J
K
L

M

N
P
R
S
T
U

± .025

4.00

± .015

1.002

+ .027
– .021

2.362

± .010

1.120

± .020

4.000

± .010

.250

+ .010
– .005

1.750

± .010

3.750

± .010

TBD

± TBD

0.181

+ .015
– .010

1.625

± .02
.015
.405

2.265

2.350

[10] [10]

.165
.753

Millimeters

146.05

101.60

25.45

60.00

28.45

101.60

6.35

44.45

95.25
TBD

4.597

41.28

.38

10.29

52.53

59.69

4.19

19.13

± .64
± .38

+ .69

– .53

± .25
± .51
± .25

+ .25
– .12

± .25
± .25

± TBD

+ .38
– .25
± .50

Figure 6c. Mounting configuration dimensions for models “WC” and “LC”

Barracuda 9LP Product Manual, Rev. C 31

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 t he drive internal defect/error management and
SCSI systems error considerations (errors in communications between Initiator and the dri ve). Tools for use in
designing a defect/error management plan are briefly o utlined in this section, with references to other sections
where further details are given.

7.1 Dri ve inte rnal defects

During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,
and their locations recorded on the drive primar y defects list (refe rred to as the “P” list and also as the EFT
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place
on the medium and the loc ation 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 Section 5.2.1.2 in the

77738479).

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 depend on t he options previ­ously set up in the error recovery parameters mode page. Error recovery and defect management may involve
the use of several SCSI commands, the details of which are descr ibed in the
The drive implements selectable error recovery time limits such as are required in video applications. For addi­tional information on this, refer to Table 5.2.1-22 in the
Mode Select/Mode Sense Error Recovery parameters.

SCSI Interface Product Manual,

SCSI Interface Product Manual.

SCSI Interface Product Manual

which describes the

part number

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 Lim it bytes in the Error Recover y Mo de
Page. The tot al amount of t ime spent in error recovery for a singl e LBA can be li mited vi a the Read Retry Count
or Write Retry Count bytes in the Error Recovery Mode Page.

The drive firmware error recovery algorithms consist of 12 levels for read recoveries and 5 levels for writes.
Table 4 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 wr ites) is one, the
RC bit is zero, and the Recovery Time Limit for the comm and has not yet been met. Tim e 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 required to i nsure 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 recover y, 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 comma nd. If
the RC bit is not set, the drive will stop data transfer with the last good LBA, and repor t a Check Condition,
Unrecovered Read Error.

32 Barracuda 9LP Product Manual, Rev. C

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

Read retry
count

0 91.9 0 50. 1
1 108.7 1 75.2
2 125.4 2 83.6
3 158.8 3 108.7
4 209.0 4 259.1
5 275.9 5 (default) 317.7
6 342.8
7 468.2
8 551.8
9 618.6
10 769.1
11 2,229.1
12 (default ) 4,933.9

Maximum recovery time per
LBA (cumul ative, msec)

Writ e re try
count

Maximum re covery ti me per
LBA (cumulative, msec)

[1] These values are subject to change.
Setting these retry c ounts to a value below the default setting could result in an inc reased unrecovered error

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

For example , suppose the Read/Write Recovery page has the RC bit set to 0, the 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 4 LB A
Read command is allowed to take up to 2 09 msec re covery time for each of the fo ur 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 comm and. The use of t he Recovery Tim e Limit field a llows finer
granularity on control of the time spent in error recovery. The recovery time limit only star ts counting when the
drive is executing error recovery and it restarts on each command. Therefore, each command’s total recovery
time is sub ject to th e recovery ti me limit. N ote: A rec overy time lim it of 0 will u se the dr ive’s default 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

Product Manual,
Manual

. Several of the messages are used in the SCSI systems error management system. The Request

part number 77738479. Messa ge Protocol System is described in the

SCSI Interface Product

SCSI Interface

Sense command retur ns 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

SCSI Interface Product Manual

. Status reporting
plays a role in the SCSI systems error management and its use in that re spect is described in sections where
the various commands are discussed.

Barracuda 9LP Product Manual, Rev. C 33

8.0 Installation

The first thing to do wh en installing a dr ive is to set the drive ID (sele ct) on the SCSI bus and set up cer tain
operating options. This is usually done by installing small shorting jumpers on the pins of connectors J2 and J6
on the PCB (or J1-Auxiliary on the “W,” “WD, ” and “LW” models), or via the drive to host I/O signals on “WC”
and “LC” models. Some users connect cables to J6 or J1-Auxiliary and perform the set-up using remote
switches.

If your sys tem is “SCAM” (SCSI Confi gured A ut o Magically ) complia nt, the syst em assign s the driv e ID ov er the
interface, so there is no need to be concerned ab out drive ID. Setting the drive ID jumpers doe sn’t hur t any­thing, but is not necessary .

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

Configure drive op t ions

For option jumper locations an d definitions refer to Figures 7a, 7b, 7c, 7d, 7e, and 7f. Drive default mode
parameters are not normally needed for installation. Refer to Section 9.3.2 for default mode parameters if they
are needed.

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

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

• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. Permanently installed ter­minators must be enabled on the drive for “N” and “W” models using jumper plug TE if termination is not pro­vided by the host equipment. On “WC,” “WD,” “LC,” and “LW” models, external terminators must be provided
by the user, systems integrator or host equipment manufacturer.

• If the drive is attached to a bus that contains ot her devices, and the new drive is not attached to the end of
the bus, the Terminator Enable jumper (TE) should be removed from the new drive.

Note. For additional information about ter m inator requirem ent s, refer to Sections 9.8 and 9.9.

• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after
power has been applied, recycle the drive power to make the new settings effective.

• Installation instructions are provided by host system document ation or with any additiona lly purchased drive
installation software. If necessary see Section 10 for Seagate support ser vic es telephone numbers.

• Do not remove the manufacturer’s i nstalled labels from th e drive and do not c over with additional labels, as
the manufacturer labels contain information required when servicing the product.

Formatting

• It is not necessary to low level for m at this drive. The drive is shipped from the factory low level for mat ted in
512 byte sectors.

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

• High level format the dr ive involves assigning one or mo re partitions or logical dr ives to the drive volume.
Follow the instructions in the system manuals for the system into which the drive is to be installed.

• Systems that have Windows 95 Operating System version 950B (thi s has FAT 32) or later do not need to
partition the drive.

8.1 Dri ve ID/optio n select heade r

Figures 7a through 7c show views of the drive ID select jumper connec to rs. Figure 7d shows the opti on select
jumper connector for all models. Figure 7b shows a rear view of model drives fo r the purpose of showing J1­auxiliary of the drive. Both J1-auxil iary and J6 have pins for selecting drive ID and for connecting the remote
LED cable. Only one or the other should be used, although using both at the same time would not damage the
drive. The notes following the figures desc ri be t he fun ctions of the var ious jumper positions on th e connectors
J2, J1-Auxiliary and J6. Suggested part number for the jumpers used on J2 is 3M part number 956562-30
(Seagate part number 89501860). A bag with the two jumper plug types is shipped with the standard OEM
drives.

34 Barracuda 9LP Product Manual, Rev. C

Drive
Front

Jumper Plug

(enlarged to
show detail)

Pin 1

J6

L

R

Reserved

SCSI ID = 0 (default)

R

E

E

E

A2A1A

D

S

S

0

SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7

[3]

Host

[4]

Alternate
Usage Plug:

+5V

[6]

Drive Activity LED

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

[4]

Reserved

Pins

1197531

642

Ground

Shipped with cover installed.

Do not install jumpers;
retain cover.

connected to host supplied optional usage plug.

Do not connect anything to pins 13-20.

Figure 7a. Barracuda 9LP family d rive ID select header f or models “N”

Notes for Figures 7a through 7f are in Section 8.1.1.

Barracuda 9LP Product Manual, Rev. C 35

Drive
Front

Jumper Plug

(enlarged to
show detail)

Pin 1

[1]

J6

R

Pins

1197531

L

E

E

S

D

[3]

Ground

A2A1A

A

3

6842

0

Shipped with cover installed.

Do not install jumpers;
retain cover.

Reserved

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

[4]

Host

Reserved

Alternate
Usage Plug:

+5V

[6]

Drive Activity LED

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 7b. Barracuda 9LP family drive ID select for models “W,” “WC,” “WD,” “LW, ” and “LC”

36 Barracuda 9LP Product Manual, Rev. C

Drive HDA (rear view, PCB facing downward)

68 Pin

SCSI I/O Connector

J1

[4]

Pin 1

Pin 12A

+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

J5

[3]

A3A2A

A

1

0

Host Alternate
Usage Plug

+5V

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

[4]

[6]

+5V

N.C.

Ground

Drive Activity LED

1197531

A0A1A2A

12 10 8 6 4 2

[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. [4]

3

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. [4]

PCB

Figure 7c. Barracuda 9LP family d rive ID select header J5 f or models “W,” “LW,” and “WD”

(J5 Pins 1A - 12A)

Barracuda 9LP Product Manual, Rev. C 37

*

Additional notes on these

functions in section 8.1.2.

Jumper

Positions

Terminator Enable

Delay Motor Start

Enable Motor Start

Write Protect

Parity Disable

Term. Power from Drive

Term. Power to SCSI Bus

Term. Power from SCSI Bus

TEDSMEWPP

J2

D

Pin 1

R

T

T

E

P

P

S

2

1

(default - applies to “N”
and “W” models only)

(default - applies to “N”
and “W” models only)

(applies to “N” and
“W” models only)

[3]

*

J2

Jumper Plug

J6

J2

(enlarged to
show detail)

Drive
Front

Figure 7d. Barracuda 9LP family drive option sel ect header for models “N,” “W ,” and “WD”

Jumper

Positions

Delay Motor Start

Enable Motor Start

R

ESDSMEWPP

J2

D

Pin 1

R

R

R

E

E

E

S

S

S

[5]

Write Protect

*

Additional notes on these

functions in section 8.1.2.

J2

*

Jumper Plug

Parity Disable

[3] [3]

J2

J6

(enlarged to
show detail)

Drive
Front

Figure 7e. Barracuda 9LP family d rive option select header for “WC” model

38 Barracuda 9LP Product Manual, Rev. C

*Additional notes on these

functions in section 8.1.2.

Jumper

Positions

Force Single-Ended I/O

Single-Ended or

Low-Voltage Differential

Delay Motor Start

Enable Motor Start

Write Protect

Parity Disable

J2

SEDSMEWPP

[3] [3]

D

Pin 1

R

R

R

E

E

E

S

S

S

[5]

J2*

Jumper Plug

J6

J2

(enlarged to
show detail)

Drive
Front

Figure 7f. Barracuda 9LP family drive option select header for models “LC” and “LW”

Barracuda 9LP Product Manual, Rev. C 39

8.1.1 Notes for Figures 7a, 7b, 7c, 7d, 7e, and 7f.

[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. Th e term “default” mea ns as stand ard 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 defau lt co ndition.

[2] The PCB on “N,” “WC,” and “LC” model drives does not have connector J5. The J5 connector signals con-

form to SFF-8009 Revision 2.0, Unitized Connec tor for Cabled Drives, signal assignments for auxiliary

connectors. See note [4].
[3] Reserved useage. Do not install any jumpers.
[4] Table 5 summarizes the configuration selection possibilities available on the different Barracuda 9LP

model drives.
[5] These signals are also on 80 pin J1. See Table 13e.
[6] Voltage supplied by the drive.

Table 5: Drive configuration selections summary

Interface
type Function

Connector

Applicable
figureJ1 J6 J5 J2

N Drive ID X none 7a
N Drive Activity LED Y [c] none 7a
N Option select none X 7d
W, WD, LW Drive ID X X, Y [e] 7b , 7c [a]
W, WD, L W Drive Activity LED Y [c] Y [c] 7b, 7c [a]
W, WD , LW Option select X 7d
WC, LC Drive ID Y[f] X none 7b [d]
WC, LC Drive Activity LED Y[b][c] Y [c] none 7b [d]
WC, LC Option select:
All Delayed Mtr Start Y[b] none X 7e, 7f
All Enable Mtr Start Y[b] none X 7e, 7f
All Write Protect none X 7e, 7f
All Parity Disable none X 7e, 7f
LC, LW SE (force single-ended) X 7f

(“X” means the function selection can be made with jumpers on that connector;

(“Y” means the signal is available to host through that connector.)

Notes for Table 5 [ ]:

[a] Use either J6 or J5, but not both.
[b] I/O connector J1 plugs directly in to host. No jumper can be installed on J1. The host suppli es the logic

state of these function signals causing the selection of these functions. See pinout Table 13e.
[c] The host can drive a remotely located Drive Activity LED using signal.
[d] Use either J1 or J6, but not both.
[e] The drive reads the ID (asserted low) from J5 pins 1, 3, 5 and 7 for 250 ms after power-on or drive reset.

Jumper plugs can be used on J5 pins 1-2, 3-4, 5-6 and 7-8 to set drive ID if desired, but usually a connec-

tor/cable is plugged to J5 to run these signals to the host for remote ID selection.
[f] The host selects drive ID through J1.

40 Barracuda 9LP Product Manual, Rev. C

8.1.2 Function description

J2
jumper
installation Jumper function description

TE (Applies only to “N” and “W” models)

On

With the jumper installed, the On-board (non-removable) t erminator circuits are enabled
(connected to the I/O lines). Default is jumpe r ins t alled.

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

SE (Applies to “LC” and “LW” models only)

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

depending on the voltage state of the I/O “DIFFSENS” line. Default is no jumper on.

DS ME (Appli es to all mo del s )

Off

Off Spindle starts immedia tely after power up—Default setting.
Off On Dri ve spindle does not star t 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 Dri ve spindle starts when Start Unit command received from host. Delayed start feature is

overridden and does not apply when ME jumper is installed.

WP (Applies to all mode l s)

On Entire drive is write protected.
Off

Drive is not write protected. Default is no WP jumper installed.

PD (A pplies to all model s)

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 (Applies to all models)

Off

Reserved jumper position. Default is no jumper installed.

TP2 TP1 (Does no t apply to “ W C” m odel)

Off Off No term inator power is connected to drive terminators or SCSI bus I/O cable*.
On

Off Drive supplies its own terminator power only. Jumper on this position is factory default.
Off On Drive supplies power to SCSI b us I/O cable*; none to internal terminators. When drives have

differential I/O circuits, a jumper on the TP1 position may be needed to power external termi­nators (see system documentation). The “WD” drives have dif ferential I/O circuits which
have no terminator circuits on the drive.

On On Dri ve supplies term inator power to itself (internal connection) and to SCSI bus I/O cable*.

This is a legal jumper setting.

TP1 and TP2
“Position A” (Applies only to “N” and “W”)

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

connects terminator power from SCSI bus I/O Term power cable* to the drive’s internal termi ­nators (for single-ended I/O only).

Off See above explanations for TP jumpers.
*See Figure 7d for pins used for Termpower.

Barracuda 9LP Product Manual, Rev. C 41

8.2 Dri ve orientati on

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 ambient temp erature immedi ately surrounding
the drive will not exceed temper ature conditions specified in Section 6 .4.1, “Te mperature.” Specific consider­ation 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 dra wer environment for the Barr acuda 9LP drive must provi de heat removal from the elec­tronics and head and disc assem bly (HDA). You should confirm that adequate heat removal is provided using
the temperature measurement guidelines descr ibed in Section 6.4.1.

Forced air flow may be required to keep temperatures at or below the specified case temperatures of Table 3,
Column 2, in which case the drive should be or iented, or air flow directed, s o that the least amount of air flow
resistance is created while providing air flow to the electronics and HDA. Also, the shortest possible path
between the air inlet and exit should be chosen to minimize the travel len gth of air heated by the drive and
other heat sources within the rack, cabinet, or drawer environment.

If forced air is det ermined to be necessar y, possible air-flow patterns are shown in Figure 8. The air-flow pat­terns are created by one or more fans, either forcing or drawi ng air as shown in the illustrations. Conduction,
convection, or other forced air-flow patterns are acc eptable as long as the temperature measurement guide­lines of Section 6.4.1 are met.

Above unit

Under unit

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

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

Figure 8. Air flow (suggested)

Above unit

Under unit

42 Barracuda 9LP Product Manual, Rev. C

8.4 Dri ve mountin g

When mounting the dri ve using the bot tom holes (x-y plane in Figure 5) c are m ust b e 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:

F

K

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

where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane
mounting surface distor tion (units of inches or millimeters). T he out-of-plane distor tion (‘x’) is determined by
defining a plane with t hree of the four mount ing points fixed and evaluating the out-of-plan e deflection of the
fourth mounting point when a known force is applied to the fourth point.

Note. B efore mounting the drive in any kind of 3.5-i nch to 5.25-inch adapter frame, verify with Seagate Tech-

nology that the drive can mee t the shock and vibration specifications given herein while mounted in
such an adapter frame. Adapter frames that are available may not have a mechanical structure capa­ble of mounting the drive so that it can meet the shock and vibration specifications listed in this manual.

8.5 Grounding

Signal ground (PCB) and HDA ground are connected together in the drive and cannot be separated by the
user. The equipment in which the drive is mounted is connected directly to the HDA and PCB with no electri­cally isolating shock mounts. If it i s desired for the system chassis to not be connected to the HDA/PCB ground,
the systems integrator or user must p rovide a nonconductive (electrically isolating) method of moun ting the
drive in the host equipment.

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

Barracuda 9LP Product Manual, Rev. C 43

9.0 Interface requirements

9.1 General description

This section descr ibes in essentially general terms the interface requirements suppor ted by the Barracuda
9LP. No attempt is made to describe all of the minute details of conditions and constraints that must be consid­ered by designers when designing a system in which this family of drives can properly operate. Seagate
declares that the drives operate in accordance with the appropriate ANSI Standards referenced in various
places herein, with exceptions as noted herein or in the Sea gate

SCSI Interface Product M anual

ber 77738479.

9.2 SCSI interface messages supported

Table 6 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Barracuda 9LP family drives.

T able 6: SCSI messages supported by Barrac uda 9LP family drives

Supported by

Message name Message code

Barracuda 9LP

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

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

Simple queue tag 20h Y
Release recovery 10h N
Restore pointers 03h Y
Save data pointer 02h Y
Synchronous data transfer req. [1] Y
Target transfer disable 13h Y
Terminate I/O process 11h N
Wide data transfer request [1] [2] Y

, par t num -

Notes.

[1] Extended messages (see the
[2] Not applicable to “N” models.

SCSI Interface Product Manual,

part number 77738479).

44 Barracuda 9LP Product Manual, Rev. C

9.3 SCSI interface commands supported

Table 7 following lists the SCSI interface commands that are supp orted in the SCSI-2, and SCSI-3 modes of
the drive. Barracuda 9LP Family drives can be changed back and forth between SCS I-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 mode.

T able 7: Comm ands supported by Barracuda 9LP fami ly drive

Command name

Command
code

Supported by
Barracuda 9LP

Change definition 40h Y
Compare 39h N
Copy 18h N
Copy and verify 3Ah N
Format unit [1] 04h Y
Block Forma t N
Bytes from index Y
Physical sector format Y
DPRY bit supported Y
DCRT bit supported Y
STPF bit supported Y
IP bit supported Y
DSP bit supported Y
IMMED bit supported Y
VS (vendor specific) N
Inquiry (see Table 8 for Inquiry Data) 12h Y

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

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

DU bit N

DS bit Y

TSD bit Y

ETC bit N

TMC bit N

LP bit N
Log sense 4Dh Y

Cache statistics page (37h) Y

Non-medium error page (06h) N

Pages supported list (00h) Y

Power-on ti me page (3Eh) Y

Read error counter page (03h) Y

S.M.A.R.T. status log page (2Fh) Y

S.M.A.R.T. attitude log page (02h) Y

Veri fy error counter page (05h) Y

Write error counter page (02h) Y
Mode select (same pages as Mode Sense comm and) 15h Y [2]

Barracuda 9LP Product Manual, Rev. C 45

T able 7: Comm ands supported by Barracuda 9LP fami ly drive (Continued)

Command name

Command
code

Supported by
Barracuda 9LP

Mode select (10) 55h Y

Capacity Programming Y

Mode sense 1Ah Y [2]

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

Information exceptions control page (1Ch) Y

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

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

Supported diagnostics pages (00h) Y

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

Actual retry count bytes Y

Deferred error supported Y

Extended sense Y

Field pointer bytes Y
Reserve 16h Y

3rd party reser ve Y

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

46 Barracuda 9LP Product Manual, Rev. C

T able 7: Comm ands supported by Barracuda 9LP fami ly drive (Continued)

Command

Command name

code

Search data low 32h N
Seek 0B h Y
Seek extended 2Bh Y
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
DPO bit supported Y
BYTCHK bit supported Y
Write 0Ah Y
Write and verify 2Eh Y
DPO bit supported Y
BYTCHK bit supported Y
Write buffer (modes 0, 2, supported) 3Bh Y
Firmware download option (modes 5, 7 suppor ted) [3] Y
Write extended 2Ah Y
DPO bit supported Y
FUA bit support Y
Write long 3Fh Y
Write same 41h Y

PB data N

LB data N
XDRead 52h N
XDWrite 50h N
XDWrite extended 80h N
XPWrite 51h N

Supported by
Barracuda 9LP

[1] The drive can format to any even number of bytes per sector from 512 to 4,096
[2] Tables 9a and 9b show how individual bits are set and which are changeable by the host.
[3] WARNING: A power loss during flash programming can result in fir m ware corrupt ion. Thi s usually m akes

the drive inoperable.

Barracuda 9LP Product Manual, Rev. C 47

Table 8 lists the Standard Inquiry command data that the drive should return to the initiator per the format given

SCSI Interface Product Manual,

in the

T able 8: Barracuda 9LP famil y drive Standard Inquiry data

Bytes Data (HEX)

0-15 00 00 [02]1[02]28B 00 [00]6[1E]353 45 41 47 41 54 45 20 VENDOR ID
16-31 53 54 [33] [39] [31] [37] [33] [4E] [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 [31] COPYRIGHT

5

112-127 [39] [39] [37]
128-143 72 69 67 68 74 73 20 72 65 73 65 72 76 65 64 20

1

[]

01 means SCSI-1 implemented;

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

part number 77738479, Sect ion 5.1.1.3.

4

20 20 20 20 20 20 20 PRODUCT ID

02 means SCSI-2/SCSI-3 implemented. Default is 02.

2

The drive can be changed between these two configurations:

[]

01 means response data in SCSI-1 format and has co mpa tib ility with Common Command Set data.
02 means response data in SCSI-2/SCSI-3 format (default is 02).

3

For “N” models this value is 1E.

[]

For “W,” “WD,” and “WC” models this value is 3E.

R# Four ASCII digits representing the last four digits of the product Fi rm ware Rele ase num ber. This informa-

tion is also given in the V ital Product Data pa ge 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.

4

Bytes 18 through 24 reflect mod el of drive. Shown here are hex values fo r Model ST39173N. Values for

[]

ST34573N are 33 34 35 37 33 4E 20.
The hex values for bytes 23 and 24 for the various models are listed below.

N W WD WC LW LC

4E 20 57 20 57 44 57 43 4C 57 4C 43

5

Copyright Year - changes with actual year.

[]

6

[]

For “N” models, this value is 00.
For models “W,” “WD,” “W C,” “LW,” and “LC,” this value is 01.

9.3.1 Inquiry Vital 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 com mand EVPD bit to one. The

SCSI Interface Product Manual,

part number
77738479, Section 5.1.1.3.1 lists the Vital Produc t Data pag es and des cr ib es their formats. A separate Inquiry
command must be sent to the drive for each Vital Product Data page the initiator wants the drive to send back.

48 Barracuda 9LP Product Manual, Rev. C

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 t he initiator.
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change­able values.

Default values are hard coded in the drive firm ware that is stored i n flash EPROM no nvolatile memory o n the
drive PCB. Default valu es can be changed o nly 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 in a Mode
Select command to set up new Current and Saved values, where the values are chang eable.

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. Par ameters in
the Saved values list that are not changeable by the Mode Select command get their values from the Default
values storage.

Current values are volatil e values currently being used by the drive to control its operation. A Mode Select com­mand can be used to c han ge t hese values (only t hose t hat are c han geable). Or i ginally, they are installed from
Saved or Default values after a power on res et, hard reset, or Bus Device Reset message.

Changeable values form a bit m ask, stored in nonvolatile memor y, that 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 Tables 9a and 9 b 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 cha ngeable, because those fields are all zeros. If some chang eable code ha d a hex value
EF, that equates to the bin ary pattern 1110 1111. If there is a zero in any bit pos ition in the field, it m eans that
bit is not changeable. Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not
changeable.

Though the drive always reports non-zero values in bytes 00 and 01, 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 drives the Saved values are taken from the Default values list and stored into the Saved val-

ues storage location on the media prior to shipping.
When a drive is powered up, it takes Saved values from the media and stores them t o the C urrent 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” sta­tus being returned.

Note. B ecause there may be several different versions of drive control firmware in the total popu lation of

drives in the field, the Mode Sense values given in the following tables may not exactly match those of
some drives.

Barracuda 9LP Product Manual, Rev. C 49

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

SCSI Interface Product Manual

, P/N 77738479).

Definitions: SAV = Saved value

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

Table 9a: Mode sense data, ST39173 values (SCSI-2/3 implementation)

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 SAV
01 DEF 81 0A C0 0C E8 00 00 00 05 00 FF FF
01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

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

03 SAV 83 16 1A 40 00 00 00 11 00 00 00 ED 02 00 00 01 00 24 00 34 40 00 00 00
03 DEF
03 CHG

04 SAV 84 16 00 1D 4D 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 09 00 00
04 DEF
04 CHG

07 SAV 87 0A 00 0B E8 00 00 00 00 00 FF FF
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

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

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

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

83 16 1A 40 00 00 00 11 00 00 00 ED 02 00 00 01 00 24 00 34 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 1D 4D 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 09 00 00
84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

08 SAV 88 12 14 00 FF FF 00 00 FF FF FF FF 80 03 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[1] FF 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 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 SAV 9A 0A 02 00 00 00 00 01 00 00 00 04
1A DEF 9A 0A 02 00 00 00 00 01 00 00 00 04
1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

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

00 SA V 80 02 00 00
00 DEF 80 02 00 00
00 CHG 80 02 77 40

[1] Though byte 12, bit 7 (A0) is shown as chan geable, the FSW function governed by that bit is not imple-

mented by this drive.

50 Barracuda 9LP Product Manual, Rev. C

T able 9b: Mode sense data, ST34573 values (SCSI-2/3 implement ati on)

Bytes 00010203040506070809101112 1314151617181920212223

Mode
Sense
Data

Mode
Page

01 SAV
01 DEF 81 0A C0 0C E8 00 00 00 05 00 FF FF
01 CHG 81 0A FF FF 00 00 00 00 FF 00 FF FF

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

03 SAV 83 16 1A 40 00 00 00 11 00 00 00 ED 02 00 00 01 00 24 00 34 40 00 00 00
03 DEF
03 CHG

04 SAV 84 16 00 1D 4D 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 09 00 00
04 DEF
04 CHG

07 SAV 87 0A 00 0B E8 00 00 00 00 00 FF FF
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

9F 00 10 08 00 87 A2 5C 00 00 02 00

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

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

83 16 1A 40 00 00 00 11 00 00 00 ED 02 00 00 01 00 24 00 34 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 1D 4D 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 09 00 00
84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

08 SAV 88 12 14 00 FF FF 00 00 FF FF FF FF 80 03 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[1] FF 00 00 00 00 00 00

0A SAV 8A 0A 02 00 00 00 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 SAV 9A 0A 02 00 00 00 00 01 00 00 00 00
1A DEF 9A 0A 02 00 00 00 00 01 00 00 00 00
1A CHG 9A 0A 00 03 00 00 00 00 00 00 00 00

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

00 SAV 80 02 00 00
00 DEF 80 02 00 00
00 CHG 80 02 77 40

[1] Though byte 12, bit 7 (A0) is shown as chan geable, the FSW function governed by that bit is not imple-

mented by this drive.

Barracuda 9LP Product Manual, Rev. C 51

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 actions and can alter the S CS I bus phase s equ enc e. Other miscel laneou s operating
features supported are also listed here. Refer to the

SCSI Interface Product Manual,

part num ber 7773 8479,

for details.

Table 10: SCSI bus conditi ons and other miscell aneous features

Condition/feature supported by:

Barracuda 9LP Conditions or feature

N Adaptive Caching
Y Adaptive Read Look-ahead
Y Arbitrating System
Y Asynchronous Data Transfer
N Asynchron ous Event Notification
Y Attention Condition
Y Capacity Programm ing
Y Contingent Allegiance Condition
Y Deferred Error Handli ng
Y Differential Interface Circuits available
Y Disconnect/Reconnect
Y Flag and Link bits in Control Byte support ed
Y Format progress indication
Y Immediate status on Format unit command
Y Immediate status on Start/Stop command
Y Immediate status on Synchro nize cache
Y Multi-mode drivers/receivers (single-ended/differential)
Y Parameter Rounding
Y Queue tagging (up to 64 Que tags supported)
Y Reporting actual retry count in Extended Sense bytes 15, 16 and 17.
Y Reset Condition
Y Segmented Caching
N Synchronized (locked) Spindle Operation
Y Synchronous Data Transfer
N Zero Latency Read

Barracuda 9LP Status supported

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

52 Barracuda 9LP Product Manual, Rev. C

9.5 Synchronous data transfer

9.5.1 Synchronous data transfer periods supported

Table 11 and Section 9.5.2 list Sync hronous Data transfer periods suppor ted by the drive. The data transfer
period to be used by the drive and the initiator is established by an exchange of messages during the Message
Phase of operation. See the section “Extended Mess age” on message protocol in the

Manual,

part numbe r 77738479. Byte 3 of the message format lists a t ransfer period factor. The factors possi-

SCSI Interface Product

ble and equivalent transfer periods are listed in Table 11.

T able 11: Synchronous data transf er periods for drive
Transfer period

factor

Transfer period
(nanoseconds)

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

Notes.

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

9.5.2 RE Q/ACK offset

The maximum value supported by the Barracuda 9LP family drives for REQ/ACK offset is 15 (0Fh).

9.6 Physical interface

Figures 9a, 9b, and 9c show the locations of the drive physical interface components for the various models of
the drive. Shown are the locations of the DC power connector, the SCSI interface connector, and the drive
select and option select headers.

Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI
operational aspects of Seagate drive interfaces are given in the

SCSI Interface Product Manual

, part number

77738479.
This section descri bes the connectors, cables, signals, terminators and bus t iming of the DC and SCSI I/O

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

9.6.1 DC cable and connector

With the exception of the “WC” drives, the drive receives DC power through a 4 pin conne ctor (see Figure 9a
for pin assignment) mounted at the rear of the main P CB. Recom men ded part numbers of the ma ting connec ­tor are listed below, but equivalent parts may be used.

Typ e of cabl e Connector Contacts (20-14 AWG)

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

AMP 61117-4 (Strip)

Model “WC” receives power through the 80 pin I/O connector. See Ta ble 13e.

Barracuda 9LP Product Manual, Rev. C 53

Pin 1

J1

Pin 1

Pin

1P
2P
3P
4P

Power

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

J1

4P 3P 2P 1P

DC Power

Connector

SCSI I/O Connector

J2

Figure 9a. Physical interface for “N” model drives

J6

54 Barracuda 9LP Product Manual, Rev. C

J1

Pin 1

J1-Auxiliary

Pin 1A

68 Pin

SCSI I/O

Connector

J1

Pin 1

Pin

1P
2P
3P
4P

J1-Auxiliary

Pin 1A

Pin 1P

J2

Power

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

J1-DC Power

1P2P3P4P

PCB

J1-DC Power

J6

Figure 9b. Model “W,” “WD,” and “LW” drive physical interface (68 pin J1 SCSI I/O connector)

J1

80 Pin SCSI I/O

and Power
Connector

Pin 1

J2

J6

Note: See Table 13e and 13f for DC power pin assignm ents.

Figure 9c. Model “WC” and “LC” drive physical interf ace (80 pin J1 SCSI I/O connector and DC power

connector)

Barracuda 9LP Product Manual, Rev. C 55

9.6.2 S CSI interface physical description

The drive models described by this product manual suppor t the physical interface requirements of the SCSI-3
Parallel Interfa ce-2 (SPI-2) stan dards as define d in American National Standard doc ument X3T10/ 1142D, and
operate compatibly at the interface with devices that only support earlier SCSI-2 and SCSI-3 standards. It
should be noted that this is only tr ue if the systems engineering has been correctly done, and if earli er 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 family of drives in this manual supports the single-ended, high voltage differential and low voltage differen­tial physical interconnects (hereafter referred to as SE, HVD, and LVD, respectively) as described in the ANSI
SPI-2 standard. Drive models whose model numbers end with “N,” “W,” and “WC” implement SE drivers and
receivers. Drive models whose model numbers end in “WD” implement HVD drivers and receivers. Drive mod­els whose model numbers en d with “LC” and “LW” implement driver and receiver circuits that can ope rate
either SE or LVD (b ut never HVD).

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, LVD, or HVD, but no t a mixture of these. On
the interface daisy chain, all si gnals are common between all devices o n t he cha in, or bus, as it is also called.
This daisy chain of SCSI devices must be terminated at both ends with the proper impedance in order to oper­ate correctly. Intermediate SCSI devices shall not be terminated. 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 sou rce internal to the device, or from a l ine in the inter­face cable specificall y powered for that purpose. On SE drive models “N” and “W,” terminator power source can
be selected using the TP jumpers on the option select header J2. TE is also on the option select header J2 for
models “N” and “W.” See Section 8.1 for details. Models “WC,” “WD , ” “LC,” and “LW” have no 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 dr ives will be integrated. See Standard X3T 10/1142D, sections 6.4
and 6.5 for the maximum number of devices that can successfully operate at various interface transfer rates on
SE, HVD, and LVD daisy chains.

“WC” model drives plug into PCB or bulkhead connectors in the Host. They may be connected in a daisy-chain
by the host backplane wiring or PCB circuit runs that have adequate DC current carrying capacity to suppor t
the number of drives plugged into the PCB or bulkhead connectors. A single 80 pin I/O connector cable cannot
support the DC current needs of several drives, so no daisy chain cables beyond the bulkhead connectors
should be used. A single drive connected via a cable to a host 80 pin I/O connector is not recommended.

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

Table 12: Interface transfer rates supported

Interface typ e /
drive models

Maximum transfer rate
Asynchronous Fast-5 Fast-10 Fast-20 Fast-40

SE “N,” “W,” “LC, ” “LW” yes yes yes yes no
LVD “LC,” “LW” yes yes yes yes yes
HVD “WD” yes yes yes yes no

56 Barracuda 9LP Product Manual, Rev. C

9.6.3 S CSI interface cable requirem ents

The characteristics of cables used to connect SCSI-3 parallel interface devices are discussed in detail in sec­tion 6 of ANSI Standard X3T10 /1142D. The cable characteristics that must be considered when in terconnect­ing 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 shielding 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 SCS I bus, the effect of impedan ce mismatc h must be c arefully cons idered.
Proper impedance matching is especially important in order to maintain adequate margin at FAST-20 and
FA ST-40 S CSI transfer rates.

For “WC” and “LC” models:

The 80 pin connector option is intended for use on drives that plug directly into a PCB or wall/bracket mounted
connector in the host equipment. In such installations, all backplane wiring segments are subject to the electro­magnetic concepts presented in St andard X3T10/1142D, section 6. For “WC” and “LC” model drives, installa­tions with connectors on cables are not recommended.

9.6.4 Mating connectors

Part numbers for the different t ype connectors that mate with the various Barracuda 9LP I/O connectors are
given in the sections following.

9.6.4.1 Mating connectors for “N” models

The nonshielded cable connector shall be a 50 c onductor connect or consisting of two rows of 25 female con­tacts with adjacent contacts 100 mils apart.

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

(for cable 3M-3425-7050 With Strain Relief, No Center Key
ends)[1] Dupont-66900-290 Wi th Strain Relief, With Center Key

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

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

with adjacent pins 100 mils apart. The connector is keyed (see Figure 11a).
Mating panel mount connector: 3M-CHE-2050-J01A 10 -KLE.

Barracuda 9LP Product Manual, Rev. C 57

9.6.4.2 Mating connectors for “W,” “WD,” and “LW” mo dels

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 AWG 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 10.
The drive device connector is a nonshielded 68 conductor conne ctor consisting of two rows of 34 female pins

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

9.6.4.3 Mating connectors for “WC” and “LC” models

The nonshielded connector shall be an 80 conductor connector consisting of two rows of 40 contacts with adja­cent contacts 50 (1.27 mm) mils apart (see Figure 11c). I/O connection 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 poss ibility for the equipment user t o attach an 80 pin cable/connecto r should be
allowed, since the length of the DC power carrying conductors could not be controlled and therefore could
become too long for safe power 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 connect or mate properly, both drive connector
and host equipment mating connect or must meet the provisions of “S FF-8 046 Spec ification for 80-pin connec­tor for SCSI Disk Drives.”

58 Barracuda 9LP Product Manual, Rev. C

Recommended mating 80-position PCB mount connectors:

Straight-in connector Hot plug version (with grou nd 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 polar izat ion

Amp Japan P/N: 5-175475-9

Righ t -angle to PCB co nnectors

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 1-800-522-675 2.

“N” Model

Drive

[6]

“W” Model

Drive

[6] [6]

[1]

2 through X

SCSI devices [4]

[7]

“LW” or

“WD” Model

Drive

Note. Do not mix “N” or “W”
drives with “WD” model
drives on the daisy chain.

Terminator

[7]

Pin 1

(check your

SCSI ID 1

[2]

SCSI ID 0

[2]

adapter for Pin 1 location)

SCSI ID 7 [5]

[1]

Host Adapter

PCB

[3]

[1] Closed end type 50 pin connector used. T erminators enabled.
[2] Open end type (in-line application) connector used. Terminators disabled.
[3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the

host having no terminator.

[4] Total interface cable length must not exceed that specified in ANSI Standard X3T10/1142D (including host

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

[5] SCSI ID7 has highest arbitration priority, ID0 has lowest for “N” models. For “W ” models, priority is ID7 to

ID0, then ID15 to ID8 (ID 8 very lowest).
[6] Last drive on the daisy chain.
[7] Open-end type 68-pi n connector used. Terminators disabled on “WD” models. If end “WD” device, exter-

nal terminator an d closed-end type 68-pin connector us ed. On “W” models, install termin ator e nable (TE)

jumper plug. “N” and “W” drives do not require ext er nal term in ators.

Figure 10. SCSI daisy chain interf ace cabling for “N,” “W ,” “WD,” and “LW” model drives

Barracuda 9LP Product Manual, Rev. C 59

77.6015.24

6.35

5.08

R 0.51 Typ.

9.27

13.89

14.86 (2X)

1.45±0.05

12.80

7.62

2.54

10.03

2.03±0.25 (3X)

Ø2.10±0.04

Trifurcated Pin

(4X)

1.27 (4X)

1.52

8.50

5.08 (3X)

6.60

1

R 0.73

17.65 62.23 Ref.

24.13

21.32

A

2 3 4

A

15.24

10.67

C 1.65X45° Typ.

0.50 Typ.

97.40

2.54 Typ. 0.64+0.05/–0.025

93.72 Ref.

68.58

60.96

Sq. Contact

Figure 11a. Nonshielded 50 pin SCSI device connect or used on “N” m odels

3.650±.005

.155

.346

1.650 .3937 .600

.050

.022

.270

.0787 .200
.020 .047

1.27 Typ.

34.29

2.16

3.81

B

2.54 6.60

B

R 0.51 Typ.

.60

(15.24)

.519

.218

(5.54)

.100

(2.54)

Pos. 68

.050

(1.27)

.980

(24.89)

1.650

(41.91)

1.816

(46.13)

Position 1

1.368

(37.74)

Pos. 35

3.650

(92.71)

.0787
(2.00)

(13.18)

.315

(8.00)

Pos.

2

Pos.

1

Pos.

4

.840 ± .005

.767

(19.48)

1

3

(21.34)

(5.08)

12

Figure 11b. Nonshielded 68 pin SCSI device connect or used on “W,” “WD,” and “LW” models

.20

typ

.085

x 45° chamfer

(2.16)

typ

.083
(2.1)

Trifurcated Pins
(4 places)

.315 ± .010

(8.00)

+.001

dia

–.002

60 Barracuda 9LP Product Manual, Rev. C

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

[

C

of Datum Y

L

12.70
(.500)

End View

2.15±0.10
2 places

Front View

Insert mating
I/O connector

X

Contact

0.50

(.020)

0.3

(.012)

MYM

1.27
(.05)

Typ

C

L

X

of Datum Y

Pin 1 Pin 40

Pin 41 Pin 80

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

Top View

Grounding

Pins

Back View

Barracuda 9LP Product Manual, Rev. C 61

T able 13a: Model “N,” single ended I/O, 50 conductor, signal /contact assignments

Signal
name [1]

Connector
contact
number [12]

Cable
conductor
number [11]

Connector
contact
number [12]

Signal
name [1]

GND 1 1 2 2 –DB0
GND 3 3 4 4 –DB1
GND 5 5 6 6 –DB2
GND 7 7 8 8 –DB3
GND 9 9 10 10 –DB4
GND11111212–DB5
GND13131414–DB6
GND15151616–DB7
GND17171818–DBP
GND19192020GND
GND21212222GND
GND23232424GND
NC [10] 25* 25 26 26 TERMPWR
GND27272828GND
GND29293030GND
GND31313232–ATN
GND33333434GND
GND35353636–BSY
GND37373838–ACK
GND39394040–RST
GND41414242–MSG
GND43434444–SEL
GND45454646–C/D
GND47474848–REQ
GND49495050–I/O

*CAUTION: Connec tor contact 25 must not be c onnected to ground at the host end or the drive end of the

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

Notes [ ]: See page following Table 13f.

62 Barracuda 9LP Product Manual, Rev. C

T able 13b: “W” models single ended I/O cable 68 conductor signa l/ contact assignments

Signal
name [1]

Connector
contact
number [3]

Cable
conductor
number [2]

Connector
contact
number [3]

Signal
name [1]

GND 1 1 2 35 –DB12
GND 2 3 4 36 –DB13
GND 3 5 6 37 –DB14
GND 4 7 8 38 –DB15
GND 5 9 10 39 –DBP1
GND 6 11 12 40 –DB0
GND 7 13 14 41 –DB1
GND 8 15 16 42 –DB2
GND 9 17 18 43 –DB3
GND10192044–DB4
GND11212245–DB5
GND12232446–DB6
GND13252647–DB7
GND14272848–DBP
GND15293049GND
GND16313250GND
TermPwr17333451TermPwr
TermPwr18353652TermPwr
Reserved 19 37 38 53 Reserved
GND20394054GND
GND21414255–ATN
GND22434456GND
GND23454657–BSY
GND24474858–ACK
GND25495059–RST
GND26515260–MSG
GND27535461–SEL
GND28555662–C/D
GND29575863–REQ
GND30596064–I/O
GND31616265–DB8
GND32636466–DB9
GND33656667–DB10
GND34676868–DB11

Notes [ ]: See page following Table 13f.

Barracuda 9LP Product Manual, Rev. C 63

T able 13c: “WD” models differen tial cable 68 conductor signal/pin assignments (Nonshielded connector)[13]

Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for

logic signals.

Signal
name [1]

Connector
contact
number [3]

Cable
conductor
number [2]

Connector
contact
number [3]

Signal
name [1]

+DB12 1 1 2 35 –DB12
+DB13 2 3 4 36 –DB13
+DB14 3 5 6 37 –DB14
+DB15 4 7 8 38 –DB15
+DBP1 5 9 10 39 –DBP1
GND 6 11 12 40 GND
+DB0 7 13 14 41 –DB0
+DB1 8 15 16 42 –DB1
+DB2 9 17 18 43 –DB2
+DB3 10 19 2 0 44 –DB3
+DB4 11 21 2 2 45 –DB4
+DB5 12 23 2 4 46 –DB5
+DB6 13 25 2 6 47 –DB6
+DB7 14 27 2 8 48 –DB7
+DBP 15 29 3 0 49 –DBP
DIFFSNS [8] 16 31 32 50 GND
TermPwr17333451TermPwr
TermPwr18353652TermPwr
Reserved 19 37 38 53 Reserved
+ATN 20 39 40 54 –AT N
GND21414255GND
+BSY 22 43 44 56 –BSY
+ACK 23 45 4 6 57 –ACK
+RST 24 47 48 58 –RST
+MSG 25 49 50 59 –MSG
+SEL 26 51 52 60 –SEL
+C/D 27 53 54 61 –C/D
+REQ 28 55 56 62 –REQ
+I/O 29 57 58 63 –I/O
GND30596064GND
+DB8 31 61 62 65 –DB8
+DB9 32 63 64 66 –DB9
+DB1033656667–DB10
+DB1134676868–DB11

Notes [ ]: See page following Table 13f.

64 Barracuda 9LP Product Manual, Rev. C

Table 13d: “LW” models differential cable 68 conductor signal/pin assignments (Nonshielded connector)[13]

Note. The minus sign next to the signal indicates asserted state is the low voltage of the two levels used for

logic signals.

Signal
name [1]

Connector
contact
number [3]

Cable
conductor
number [2]

Connector
contact
number [3]

Signal
name [1]

+DB12 1 1 2 35 –DB12
+DB13 2 3 4 36 –DB13
+DB14 3 5 6 37 –DB14
+DB15 4 7 8 38 –DB15
+DBP1 5 9 10 39 –DBP1
+DB0 6 11 12 40 –DB0
+DB1 7 13 14 41 –DB1
+DB2 8 15 16 42 –DB2
+DB3 9 17 18 43 –DB3
+DB4 10 19 2 0 44 –DB4
+DB5 11 21 2 2 45 –DB5
+DB6 12 23 2 4 46 –DB6
+DB7 13 25 2 6 47 –DB7
+DBP 14 27 2 8 48 –DBP
GND15293049GND
DIFFSNS [8] 16 31 32 50 GND
TermPwr17333451TermPwr
TermPwr18353652TermPwr
Reserved 19 37 38 53 Reserved
GND20394054GND
+ATN 21 41 42 55 –ATN
GND22434456GND
+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
+DB1033656667–DB10
+DB1134676868–DB11

Notes [ ]: See page following Table 13f.

Barracuda 9LP Product Manual, Rev. C 65

Table 13e: “WC” models single ended I/O, 80 conductor cable signal/contact assignments

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 GND [8]
–DB11 7 47 GND
–DB10 8 48 GND
–DB9 9 49 GND
–DB8 10 50 GND
–I/O 11 51 GND
–REQ 12 52 GND
–C/D 13 53 GND
–SEL 14 54 GND
–MSG 15 55 GND
–RST 16 56 GND
–ACK 17 57 GND
–BSY 18 58 GND
–ATN 19 59 GND
–DBP 20 60 GND
–DB7 21 61 GND
–DB6 22 62 GND
–DB5 23 63 GND
–DB4 24 64 GND
–DB3 25 65 GND
–DB2 26 66 GND
–DB1 27 67 GND
–DB0 28 68 GND
–DP1 29 69 GND
–DB153070GND
–DB143171GND
–DB133272GND
–DB123373GND
+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- START [5] [9] 38 78 DLY D - 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 fo llowing Table 13f.

66 Barracuda 9LP Product Manual, Rev. C

T able 13f: “LC” diff erential models, 80 pin I/O connector pin assignments (nonshielded connector)

Connector
Signal
name [1]

contact

number [3]

Signal
number [3]

Contact
name[1]

12 V CHARGE 1 41 12 V GND
12 V 2 42 12 V GND
12 V 3 43 12 V GND
12 V 4 44 MATED 1
NC [10] 5 45 NC [10]
NC [10] 6 46 DIFFSNS [8]
–DB11 7 47 +DB 11
–DB10 8 48 +DB 10
–DB9 9 49 +DB9
–DB8 10 50 +DB8
–I/O 11 51 +I/O
–REQ 12 52 +REQ
–C/D 13 53 +C/D
–SEL 14 54 +SEL
–MSG 15 55 +MSG
–RST 16 56 +RST
–ACK 17 57 +ACK
–BSY 18 58 +BSY
–ATN 19 59 +ATN
–DBP 20 60 +DBP
–DB7 21 61 +DB7
–DB6 22 62 +DB6
–DB5 23 63 +DB5
–DB4 24 64 +DB4
–DB3 25 65 +DB3
–DB2 26 66 +DB2
–DB1 27 67 +DB1
–DB0 28 68 +DB0
–DP1 29 69 +DP1
–DB153070+DB15
–DB143171+DB14
–DB133272+DB13
–DB123373+DB12
+5 V3474MATED 2
+5 V35755 V GND
+5 V36765 V GND
NC [10] 37 77 ACTIVE LED OUT [4] [9]
RMT- START [5] [9] 38 78 DLY D - 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]

[13]

Notes [ ]: See page following this Table.

Barracuda 9LP Product Manual, Rev. C 67

Notes [ ] for Tables 13a through 13f.

[1] See Section 9.7.1 or 9.6.4.2 for detailed electrical characteristics of these signals.
[2] The conductor number refers to the conductor pos ition when usin g 0.025-inch (0.635 mm) centerl ine 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] Asser te d by host to enable Motor Start option (enables start ing m otor via SCSI bus command).
[6] Asserted by host to enabl e Del ayed 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 ULTRA-2 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] The conductor number refers to the conductor position (right to left in Figure 10) when using 0.050 inc h

(1.27 mm) centerline flat ribbon cable. Other cable types may be used to impl ement equivalent contact

assignments.
[12] Connector contacts are on 0.100 inch (2.54 mm) centers.
[13] 8 bit devices which are connected to the 16 data bit differential I/O shall leave the following signals open:

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

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

to ground: +DB12 +DB13 +DB 14 +DB15 +DB P1 +DB8 +DB9 +DB 10 +DB 11,

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

68 Barracuda 9LP Product Manual, Rev. C

9.7 Electrical descr iption

“N” and “W” models use single-ended interface signals. These signals must be terminated with 110-ohm active
termination circuits at each end o f the total cable. Single-ended circuits use open col lector or three state driv­ers. These models can be configured to provide the SCSI termination.

The “WD” model uses high-voltage (HVD) differential interface s ignals and each of these must be terminated at
each end of the total cable with 330 ohms to +5V and 330 ohms to ground with 150 ohms between each differ­ential pair. A ll I/O circuits are open collector, three state drivers. These HVD I/O drives are shipped without ter­minators. These drives have no provisions for adding terminator sockets on the PCB. This means some
method of external termination must be provided by the user when termination is required.

“WC” and “LC” models use the single connection attachment (SCA) connector. This 80-pin connector is
designed to plug directly into a back panel or plane. No external cables are required. Active terminators on the
back panel must be provided by the user. This connector is not recommended where cabling is required.

“LC” and “L W” models are Multimode drives. That is, t heir I/O circuits can operate as either single-ended or low
voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line). They require exter nal termi na­tors. See Section 9.7.2.2 for additional information on these models.

Note. The SCSI protocol chip drives the upper eight data an d parity bits of the SC SI bus even when op erat-

ing in narrow (eight bit) mode. This is normal operation for this chip. If the unused data bit signals are
connected to conductors that extend out beyond this drive’s SCSI connector, correct termination must
be provided for these unused signals at the device/system at each end of the bus onto which this drive
is connected. T ermination is required to control radiated emissions and conducted noise on other SCSI
bus signals.

See ANSI Standard X3T10/1142D for detailed electrical specifications.

9.7.1 Single-ended drivers/receivers

For “N,” “W,” and “WC” models which use single-ended drivers and receivers, typical circuits are shown in Fig­ure 12. Terminator circuits (Note [1]) are to be enabled only when the disc drive is first or last in the daisy-chain.

Transmitter characteristics

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

Receiver characteristics

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

Line Driver

Transmitter

(or transceiver)

TP TP

[4]

Flat

Cable

Pair

[5]

[3]

[1]

110

Ohm

Line Receiver

[4]

[1]

Receiver

110

Ohm

[2]

Figure 12. Single-ended t ransmitters and receivers

[2]

Notes.

[1] Part of active terminator circuits. Non-removable LSI terminators, enabled in the drive (m odels “N” and

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

Barracuda 9LP Product Manual, Rev. C 69

[2] ANSI SCSI compatible circuits.
[3] Total interface cable length should not exceed that specified in ANSI Standard X3T10/1142D.
[4] Source of drive terminator power is an active circuit which has an input source voltage selected by jumper

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

[5] Interface signal levels and logical sense at the drive I/O connector for “N,” “W,” and “WC” models are

defined as follows:
Vil (low-level input voltage) = 1.0 V maximum (signal true); minimum = Vss – 0.5 V.
Vih (high-level input voltage) = 1.9 V minimum (signal false); maximum = Vdd +0.5V.
Vihys (Input Hysteresis) = 425 mV minimum

9.7.2 Differential drivers/receivers

9.7.2.1 High-voltage differential (HVD) alternative

HVD drivers and receivers are used by the “WD” model. Typic al circuits are shown in Figures 13 and 14. The
drive has no provisions for ter m inator circuits on differential I/O drives. When the “DI FFSEN S” interface line is
between 2.4 V and 5.5 V, it selects HVD interface operation.

HVD signals

All differential interface signals consist of two lines denoted +SIGNAL and –SIGNAL. A signal is true when
+SIGNAL is more positive than –SIGNAL, and a signal is false when –SIGNAL is more positive than +SIGNAL.
Drive user or systems integrator must provide some external means of termination.

Output characteristics

Each signal driven by differential interf ace drives shall hav e t h e following output characteristics when measured
at the disc drive SCSI connector:

Low-level output voltage* = 2.0 V maximum at Low-level output current = 55 milliamps.
High-level output vol tage* = 3.0 V minimum at High-level output current = –55 milliamps
Differential voltage = 1.0 V minimum with common-mode voltage ranges from –7 V dc to +12 V dc.

*These voltages shall be measured between the output terminal (either + signal or – signal) and the SCSI
device’ s logic ground reference.

The output characteristics shall additionally conform to EIA RS-485-1983.

HVD Differential

Driver

Signal +

Signal –

HVD Differential

Driver

Signal +

Signal –

3V

2V +55ma

2V

3V –55ma

–55ma

+55ma

= True / Logic 1 / Assertion

V

0

= False / Logic 0 / Negation

V

0

| = 1V

|V

0

Figure 13. HVD output signals

Input characteristics

Each signal received by different ial interface dr ives s hall have the following input characteristics when mea­sured at the disc drive SCSI connector:

Input current on either input = +2.0 milliamps maximum (includes both receivers and passive drivers).

70 Barracuda 9LP Product Manual, Rev. C

This requirement shall be met with the input voltage varying between –7 V dc and +12 V dc, with power on or
off, and with the hysteresis equaling 35 mv, minimum.

The input characteristics shall additionally conform to EIA RS-485-1983.

+5V

5.6K

Transmit/Receive

Enable [1]

DIFFSENS [6]

Transmit or
Receive
Signal [2]

SCSI Device at Beginning of I/O Cable
(usually Host Adaptor/Initiator)

+5V

TE

LSI

XCVR

RE
Disable

R2

Term

[5]

Power

330

150

Ohm

330

[7]

[4]

+5V

TE

LSI

XCVR

RE

Disable

R2

[3]

1
1

Twisted or Flat

Cable Pair

Term

Power

330

Ohm

150

Ohm

330

Ohm

[5]

[4]

Ohm

1
1

Ohm

+5V

5.6K

Transmit/Receive

Enable [1]

DIFFSENS [6]

Transmit or
Receive
Signal [2]

SCSI Device at End of I/O Cable
(Drive/Target)

[7]

Notes.

[1] Positive Logic Enables Transmitter (+5 V = Asserted)

Negative Logic Enables Receivers (0 V = Asser ted)
[2] Negative Logic Signal (0 V = Asserted)
[3] Total interface cable length should not exceed value given in Section 9.6.3 from first SCSI device at begin-

ning to end of daisy-chain. See Section 9.7.2 for signal characteristics.
[4] I/O Line ter minat ors. If SCSI device is a Seagate di sc dr ive, termi nat ors and a pla ce to plug them in must

be provided external to the drive by user, systems integrator or host equipment manufacturer where

needed. The drive has no terminators and there are no provisions on the drive for terminator installation.
[5] Arrangements for connecting terminator power to the terminators must be made by the systems designer.

As a help, drive +5 V power is made available on SCSI bus (“N,” “W,” and “WD” m odels) fo r powering

external terminators if the drive option select header jumpe r TP (Figure 7d) is installed in rightmost posi-

tion “TP.” See pin assignment T ables 13b and 13c for pins assigned to terminator power.
[6] SCSI I/O line (pin 21) di sables I/O) circuits if single-ended cable plugged in or cable plu gged in upside

down. Ground indicates a single-ended device is on the bus. Drive will not operate I/O bus in HVD mode if

this line is less than 2.4 V.
[7] SCSI I/O cable ground. See Table 13b.

Figure 14. Typical high-voltage differential I/O line transmitt er/receiver and external terminators

Barracuda 9LP Product Manual, Rev. C 71

9.7.2.2 Multimode—SE or LV D alternative

“LW” and “LC” models have I/O circuits that can operate either in single-ended (SE) or low voltage differential
mode (LVD). Wh en the interface “DIFFSNS” line is between 0 V and .6 V, t he drive interface circuits operate
single-ended and up to and including 20 M transfers/s (Fast-20 or Ultra-1 SCSI). When “DIFFSENS” is betwen
+0.7 V and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 40 M
transfers/s or less (Fast-40 or Ultra-2 SCSI). This arrangement is not intended to allow dynamically changing
transmission modes, but rather to preven t incompatible devices from attempting to interoperate. Drives must
operate only in the mode for which the install ation and interface cabling is designed. Multimode I/O circuits
used by “LC” and “LW” devices do not operate at high voltage differential levels and should never be exposed
to high voltage differential environments unless the common m ode voltages in the environment are cont rolled
to safe levels for single-ended and low voltage differential devices (see the ANSI SPI-2 specification X3T10/
1142D).

Multimode signals

Multimode circuit SE alternat ive signal characteristics are the same as descr ibed in Section 9.7.1. The SE
alternative for these circuits is selected as described above. SE cabl es and termi nat ion must be used.

Multimode circuit LVD alternative signal characteristics are not the same as the differential signals described in
Section 9.7.2.1. The SCA-2, 80-pin connector signal/pin assignments are the same for HVD and LVD (see
Tables 13c and 13e), but the electrical characteristics of the signa ls are not the same. “LC” and “LW” mode l
drives do not have onboard terminators. The Multimode sig nal lines (either SE or LVD) shou ld be terminat ed
with 110 ohm active terminator circui ts at each end of the to tal ca ble. Ter mi nation 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

s

at the disc drive connector:
Steady state Low level output voltage* = –.95 V = < V

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 negation/logic 0)

s

= < 1.55 V (signal assertion/logic 1)

s

*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 –

1.55V

.95V +15ma

.95V

1.55V –15ma

–15ma

+15ma

= True / Logic 1 / Assertion

V

0

= False / Logic 0 / Negation

V

0

| = .6V

|V

0

Figure 15. L VD output signals

72 Barracuda 9LP Product Manual, Rev. C

Input characteristics

Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when
measuared at the disk drive connector:

Steady state Low level output vol tag e* = 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)

s

= < –0.030 V (signal assertion/logic 1)

s

(X3T10/1142D revision 13, p. 152)
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
This requirement shall be met with the input voltage varying between 0.700 V and 1.8 V, with power on or off,

and with the hysteresis equaling TBD mV, minimum.
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

–Signal
–Signal

Figure 16. Typical SE-LVD alternative transmitter recei ver circuits

9.8 Terminator requirements

Internal disc dr ive I/O termination (provided onl y in model “N” and “W” d rives single ended I/O mo del drives)
consists of active circuits in an LSI modul e that is per manently m ounted on the PCB. All single initiato r/single
target (non-daisy-chain) appl ications require t hat the Initiator and disc dr ive be ter minated. Daisy- chain appl i­cations require that only the units at each end of the daisy-chai n be terminated. All other peripherals on the
chain must not be terminated. (See Figure 10).

Note. Rem ove drive terminator enabling jumper TE where terminators are not required. Removal of termina-

tor power source selection jumper TP (see Figure 7d) does not disconnect the terminator resistors
from the circuit.

It is highly recommended that ANSI SCSI -2 Standard’s Alternative 2 termination (active termination) be used
for applications with single-ended (“N” and “W” models), especially if the bu s will be operated at transfer rates
above 5 Mbytes/sec. The “N” and “W” models provide on-board active termination that can be disabled by
removal of the enable jumper TE (see Figure 7d).

Note. ACTIVE TERMINATORS ARE HIGHLY RECOMMENDED FOR USE IN THE DAISY-CHAIN AS

DESCRIBED ABOVE. ACTIVE AND PASSIVE TERMINATORS SHOULD NOT BE MIXED ON THE
SAME SCSI BUS.

Drive models “WD,” “WC, ” “L W,” and “LC” do not have internal terminators available. The user, systems integra­tor or host equipment manufacturer must provide a terminator arrangement external to the drive. For “ND,”
“WD,” and “LW” models, terminator modules can be purchased that plug bet ween the SCSI I /O cable and the
drive I/O connector or on the end of a short I/O cable stub extending past the last cable connector.

Barracuda 9LP Product Manual, Rev. C 73

Note. The SCSI protocol chip drives the upper eight data an d parity bits of the SC SI bus even when op erat-

ing in narrow (eight bit) mode. This is normal operation for this chip. If the unused data bit signals are
connected to conductors that extend out beyond this drive’s SCSI connector, correct termination must
be provided for these unused signals at the device/system at each end of the bus onto which this drive
is connected. T ermination is required to control radiated emissions and conducted noise on other SCSI
bus signals.

ANSI Standard X3T10/1143D contains additional details about SCSI bus terminator and terminator power
requirements.

9.9 Terminator power “N” and “W” model drives

You can configure t ermina tor power in four different ways. See Section 8 .1 for illustratio ns that sh ow how to
place jumpers enabling each of the following terminator power configurations:

1. Drive accepts terminator power through SCSI bus pins:
“N” Models Pin 26
“W” Models P ins 17, 18, 51, and 52

2. Drive supplies power to the SCSI bus.

3. Drive provides terminator power for optional internal terminator resistors using the drive’s power connector.

4. Drive provides power to its own terminators and to the SCSI bus terminator power line.

SCSI devices providing terminator power (TERMPWR) must have the following characteristics:
8-bit SCSI V TERM = 4.25 V to 5.25 V

800 mA minimum source drive capability

1.0 A maximum

16-bit SCSI V TERM = 4.25 V to 5.25 V

1,500 mA minimum source drive capability

3.0 A maximum

“WD” and “LW” model 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 term inator. See Section 8.1 for illustrations that show how to place
jumpers for this configuration.

“WC” and “LC” model drives

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

74 Barracuda 9LP Product Manual, Rev. C

9.10 Disc drive SCSI timing

T able 14: Disc drive SCSI timing

These values are not current Barracuda 9LP values, but are listed for information only.

Description

Waveform
symbol [1]

Waveform
table [1] Typical timing

Target Select Time (no Arbitration) T00 N/A <1.4 µs
Target Select Time (with Arbitration) T01 4.5-1,2 1.93 µs
Target Select to Command T02 4.5-1 3.77 µs
Target Select to MSG Out T03 4.5-2 1.57 µs
Identify MSG to Command T04 4.5-3 3.36 µs
Command to Status T05 4.5-5 Command Dependent
Command to Data (para. In) T06 4.5-9 Command Dependent
Command to Data (para. Out) T07 4.5-10 Command Dependent
Command to Data (Write to Data Buffer) T08 4.5-10 Command Dependent
Command to Disconnect MSG T09 4.5-6 Command Dependent
Disconnect MSG to Bus Free T 10 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 T13 4.5-7 1.60 µs
Reselect to Identify MSG In T14 4.5-7 1.39 µs
Reselect Identify MSG to Status T15 4.5-8 Command Dependent
Reselect Identify MSG to Data (media) T16 4.5-11 Command Dependent
Data to Status T17 4.5-15 Command Dependent
Status to Command Complete MSG T18 4.5-5,8,15 0.98 µs
Command Complete MSG to Bus Free T19 4.5-5,8,15 0.51 µs
Data to Save Data Po inter 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

Barracuda 9LP Product Manual, Rev. C 75

T able 14: Disc drive SCSI timing

These values are not current Barracuda 9LP values, but are listed for information only.

Description

Waveform
symbol [1]

Waveform
table [1] Typical timing

Next CDB Byte Access (Byte 10 of 10) T23.10. 10 4.5-4 0.12 µs ±1 µs
Data In Byte Transfer (parameter) T24 4.5-12 0.04 µs
Data Out Byte T ransfer (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 0.0 4 µs
Data Out Byte T ransfer (media) [2] T29 4.5-13 0.04 µs
Next Data In Byte access (media [2] T30 4.5-12 0.12 µs
Next Data Out Byte access (media [2] T31 4.5-13 0.12 µs
MSG IN Byte Transfer T32 4.5-5,7,8,14,15 0.04 µs
MSG OUT Byte Transfer T33 4.5-2 0.04 µs
STATUS Byte Transfer T34 4.5-5,8,15 0.04 µs
Synchronous Data Transfer Characteristics:

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

Notes.

[1] See the

SCSI Interface Product Manual,

part number 77738479, Section 4.5
[2] Maximum SCSI asynchronou s 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 Sections 3.1.5.2 and 3.5.3.2 of the

face Product Manual,

for a description of synchronous data transfer operation.

SCSI Inter-

Barracuda 9LP Product Manual, Rev. C 77

10.0 Seagate Technology support services Presales support

To determine which Seagate products are best su ited for your specific application, contact us about configura­tion and compatibility and for current product availability. You can leave a voice message after business hours
or send an e-mail message—we reply during business hours.

Disc Drives 1-877-271-3285 or 405-936-1210 Fax: [phone]

(8:00 A.M. to 12:15 P.M., 1:30 P.M. to 6:00 P.M., central time, M–F)
e-mail: [e-mail]

Tape Products 1-800-626-6637 or 715-641-2500 Fax: [phone]

(6:00 A.M. to 5:00 P.M., pacific time, M–F)
e-mail: [e-mail]

Note. You can purchase select tape products and tape ac cesso ries t hrough S eagate E xpres s 24 hours da ily

by calling 1-800-531-0968 or by faxing your order to 972-481-4812.

Technical support services

If you need assistance installing your drive, consult your dealer. Dealers are familiar with their unique system
configurations and can hel p you with s ystem conf li cts an d other technical issues. If you need additional assis­tance with your Seagate
listed below.

®

drive or other Seagate products, use one of the Seagate technical support services

SeaFONE®1-800-SEAGATE

Seagate’s 800 number (1-800-732-4283) allows toll-free access to automated self-help services, providing
answers to commonly asked questions, troubleshooting tips, and specifications for disc drives and tape drives.
This service is available 24 hours daily and requires a touch-tone phone. International calle rs can reach this
automated self-help service by dialing 405-936-1234.

Online services

Using a modem, you can obtain troubleshooting tips, free utility programs, drive specifications and ju mpe r set­tings for Seagate’s entire product line. You can also download software for installing and analyzing your drive.

SeaNET

You can obtain technical informa tio n about Seagate products over the Internet from Seagate’s World Wide
Web home page (http://www.seagate.com) or Seagate’s ftp ser ver (ftp://ftp.seagate.com). You can also send
e-mail with your questions to [e-mail] or TapeSupport@Sea gat e.com.

SeaBOARD

SeaBOARD is a com puter bulletin board system that contain s informa tion about Seagate disc a nd tape dr ive
products and is available 24 hours daily. Set your communications software to eight dat a bits, no parity, and
one stop bit (8-N-1).

Location Phone number

Australia 61-2-9756-2359
France 33 1-48 25 35 95
Germany 49-89-1409331
Taiwan 886-2-2719-6075
Thailand 662-531-8111
UK 44-1628-478011
USA Disc: 405-936-160 0; Tape: 405-936-1630

®

78 Barracuda 9LP Product Manual, Rev. C

FAX services

SeaF A X

You can use a touch-tone telephone to acc ess Seagate ’s automated FAX system to receive technical supp ort
information by return FAX. This serv ice is available 24 hours daily.

Location Phone number

Australia 61-2-9756-5170
Germany 49-89-14305102
UK 44-1628-894084
USA 1-800-SEAGATE or Disc: 405-936-1620; Tape: 405-936-1640

Technical support FAX

You can FAX questions or comments to technical suppor t spec ialists 24 hours daily. Responses are sent dur­ing business hours.

Location Phone number

Australia 61-2-9725-4052
France 33 1-46 04 42 50
Germany 49-89-14305100
Hong Kong 852-2368 7173
Japan 81 -3-5 462-2979
Korea 82-2-556-4251/ 7395
Singapore 65 -488-7528
Taiwan 886-2-2715-2923
UK 44-1628-890660
USA Disc: 405-936-168 5; Tape: 405-936-1683

®

Direct-support services

Technical support

For one-on-one help, you can talk to a technical s upport specialist during local business hours. Before calling,
note your syste m conf igu ration and drive model number (ST

Location Phone number

A.M

Australia 61-2-9725-3366 (9:00
France 33 1-41 86 10 86 (9:30
Germany 49-89-1409332 (9:30
Hong Kong 852-2368 9918 (9:00
Korea 82-2-531-5800 (9:00
Singapore 65-488-7584 (9:00

. to 5:00 P.M., eastern time, M–F)

A.M

. to 12:30 P.M., 2:00 P.M. to 5:00 P.M., M–F)

A.M

. to 12:30 P.M., 2:00 P.M. to 4:00 P.M., M–F)

A.M

. to 12:00 P.M., 2:00 P.M. to 5:30 P.M., M–F)

A.M

. to 12:0 0 P.M., 1:00 P.M. to 6:00 P.M., M–F)

A.M

. to 12:00 P.M., 2:00 P.M. to 5:00 P.M., M–F)

Taiwan 886-2-2514-2237

A.M

UK 44-1628-894083 (10:00

. to 1:00 P.M., 2:00 P.M. to 5:00 P.M., M–F)

USA Please dial 1-800-SEAGATE or 405-936-1234 for the specific product telephone number.

A.M

(8:00

. to 12:15 P.M., 1:30 P.M. to 6:00 P.M., central time, M–F)

SeaTDD™405-936-1687

Using a telecommunications device for the deaf (TD D), you can send q uestions or comment s 24 hours daily
and exchange messages with a technical suppor t specialist from 8:00

P.M

. (central time) Monday through Friday.

xxxx

).

A.M

. to 12:15 P.M. and 1:30 P.M. to 6:00

Barracuda 9LP Product Manual, Rev. C 79

Customer service centers

Seagate direct OEM, Distribution, and Systems Integrator customers should contact their Seagate service rep­resentative for wa rranty information. Other customers should contact their place of purchase. Seagate offers
comprehensive customer support for all Seagate drives. These services are available worldwide.

Location Phone number FAX number

Asia Pacific and Australia 65-485-3595 65-488-7503
Middle East and Africa 31-2031-67222 31-2065-34320
Europe 31-2031-67222 31-2065-34320

European toll-free phone numbers are available for y ou to contact customer service representatives

A.M

between 8:30
center is located in Amsterdam, The Netherlands.

Location Toll-free phone number

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 1 677 90 695
Netherlands 0 800-732 4283
Norway 800-113 91
Poland 00 800-311 12 38
Spain 900-98 31 24
Sweden 0 207 90 073
Switzerland 0 800-83 84 11
Turkey 00 800-31 92 91 40
United Kingdom 0 800-783 5177

Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740

Other Americas (Brazil, Canada, Mexico) 405-949-6706 405-949-6738

. and 5:00 P.M. (European central time) Monday through F riday. The European call

Manufacturer’s repres entat ives

Brazil

MA Informatica 55-21-516-6649 55-21-516-5280

Canada

Memofix
Adtech

Mexico

Abicom Seamax SA DE CV 525-546-4888 525-546-4888

Southern Europe

Caesar Italia 39-688-18149 39-688-02103

905-660-4936
905-812-8099
1-800-624-9857

905-660-4951
905-812-7807

Barracuda 9LP Product Manual, Rev. C 81

Index

Symbols

+5 and +12 volt supplies 19
“G” list
“P” list

Numerics

19433

50 conductor connector
50 pin connector
68 conductor connector
80 conductor connector
80 conductor interface
80 pin connector option
80 pin I/O connector

A

AC power 19
access time
accessories
acoustics
active circuit
activity indicator
actuator
actuator assembly
adaptive read look-ahead
adaptive servo calibration
address
air circulation
air cleanliness
air flow

air inlet
altitude
altitude and atmospheric pressure
ambient
ambient temperature
ANSI SCSI do cuments
ANSI SCSI-2/SCSI-3 SPI-2
ANSI SPI-2 (T10/1142D)
arbitration priority
ARLA
asynchronous interface transfer rate
audible noise
Australia/New Zealand Standard
Australia’s Spectrum Management Agency (SMA)
automatic retry
automatic shipping lock
average idle current
average latency
average rotational latency

31

31

Figure x.

Figure 13. ?

9, 10
8

26

7, 41

11

21, 41

suggested

41
24

22

12

72

67

41

26

41

3, 7

13

7

69

56

58, 59

57
57

57

56

55, 65, 66

6

21, 41

4

15

58

6

19

12
20

5

9, 10

21

75

4

B

background processing 7

55

5

48

backwar d co mp atibility
bits/inch
buffer
buffer segment
buffer-full
buffer-full ratio
bulkhead connector
bus device reset message
bytes per sector
bytes/surface
bytes/track

9

11, 12

11

9

11, 12

11

46

9

C

cabinet cooling 41

52

cable
cable length
cache
cache buffer
cache miss
cache mode
cache operation
cache operation hit
cache segment
caching write data
calibration
Canadian Department of Communications
capacities
capacity, drive, programmable
case temperature
CE Marking
change definition command
changeable bit
changeable value
check condition
class B limit
command
command descriptor block (CDB)
command queuing
condensation
conducted noise immunity
connect/disconnect
connector
connector contact
connector key
consecutive read operation
contiguous blocks of data
continuous vibration
controller

4

controller overhead
controlle r self test
cooling
cooling air
C-Tick Marking
current

69

11, 12

7

11

11

20

8

3

3

11, 44

52

11

41

22

20, 68

11

12

11

12

21, 22

49

48

48

7

21, 24

10

67

56

9

20

3, 4

26

8

44

19, 20

12

12

10

3

82 Barracuda 9LP Product Manual, Rev. C

current I/O processes 15
current lim it ing
current profile
current requirements
current value
cylinder boundary

20

20, 21

48, 49

12

19

D

daisy-chain 20, 55, 56, 58, 68, 72

80 conductor
data area
data correction
data transfer period
data transfer protocol
data transfer rate
DC cable and connector
DC current
DC power
DC power carrying conductor
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
DEXCPT
diagnostics
differential I/O circuit
differential interface signals
differential SCSI driver
differential SCSI receiver
differentiating features
DIFFSENS
dimensions
disable read ahead
disc access
disc drive

disc media
disc rotational speed
disconnect/reconnect

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

drive configuration

20

10, 11, 13, 21, 40, 52

39, 40

15

termination

control

specification

12

26

programmable

57

13

52

7

9

55

52, 53, 54

57

48, 49

40

14

20

40

40, 69, 71

27

12

11

72

9

9

11

11

11

67

39

9

8

39

52

19

6

33

31

19, 67

14

7, 69

7, 69

5

12

68

57

57

37, 38

31

33

33

31

33

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

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

14

33, 39

20

33

39

40

11

33

48
34, 35, 36

15

14

27, 42

13

10, 41

74

52

14

7

E

ECC 13

13

47

41

31

31

10

31

7

3

70

3

21

13

26

7

52, 67

13

13

32

13

3

26

3

ECC correction
ECC correction capability
EFT defect list
EIA RS-485-1983
electrical characteristics
electromagnetic compatibility
electromagnetic compatibility (EMC)
electromagnetic interference (EMI)
electromagnetic susceptibility
embedded servo
EMC com plia nce
EMI requirements
environment
environmental control
environmental interference
environmental limits
environmental requirements

13

15

48

EPROM
equipment malfunction
error
error management system
error rate
error rate calculation
error recovery
ESD
European Union requirements
EVPD bit
execution time

13

4

Barracuda 9LP Product Manual, Rev. C 83

extended messages 43

F

Fast-10 transfer rate 55

46

4

48

13

14

8

33

27

5, 7, 10

5, 7, 10

67

10

9

10

67

49

55

55

55

56

56

3

Fast-20
Fast-20 SCSI
FAST-20 transfer rate
Fast-20 transfer rate
Fast-40 SCSI
FAST-40 transfer rate
Fast-40 transfer rate
Fast-5 transfer rate
fault status
FCC rules and regulations
field repair
firmware
flat ribbon cable
flaw reallocation
format
format command
format time
formatted
formatting
front panel
front panel LED
FSW function

G

GOOD 12
gradient
ground
ground return
grounding

22, 24

61

42

19

H

hard reset 48
hardware error

5, 14, 22, 41, 42

HDA

temperature
head and disc assembly.
heads
heat removal
heat source
high level format
high voltage differential
host
host adapter

host backplane wiring
host equipment

host I/O signal
host system
host system malfunction
host/drive operational interface

20

12, 31, 39, 40, 46, 55, 58, 61

adapter/initiator

DC power

manufacturer

14

22

41

41

33

33

42, 56, 57

57

33

33

33

58

55

15

See

13

HDA

13

hot plug
humidity
HVD

7, 15

21, 24

15, 55, 68, 69, 70, 71

I

I/O cable 61

40

33

7

39, 55

72

31

21

72

47

4, 8

10

68

68

13

9

9

58

33

43

55

47

7

19

I/O connector
I/O line
I/O te r m inatio n
identified defect
idle condition
initiator

inquiry command
inquiry vital product data
installation
installation guide
installation instructions
instantaneous current peak
integrated SCSI controller
int erface cable leng th
int erface data
interface requirements
int erface signals

int erface timing
Interface transfer rates
interleave
interleave factor
internal data rate

termination

dif ferenti al
single-ended

J

J1-auxiliary 33
jumper
jumper function description
jumper header
jumper plug
jumper plug TE
jumper plug TP
jumper plug type

8, 33, 39, 40, 67

40

39

33

68
69

33

L

landing zone 7, 20

11

LB
logical
logical block
logical characteristics
logical segment (mode select page 08h)
low level fo rma t
low voltage differential mode
LSI module
LVD
LVD mode

11

11, 12

72

5, 55, 71

15

33

52

15

11

84 Barracuda 9LP Product Manual, Rev. C

M

magnetoresistive heads 5
mating connector
mating flat cable connector
maximum case temperature
maximum current requirements
maximum operating current
maximum starting current
ME jumper
mean time between failure.
media
media defect
media defect induced error
medium error
message protocol
message protocol system
messages

SCSI interface
miscellaneous features
mode page 01
mode page 08h
mode parameter

page 08h
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 option
mounting configuration
mounting configuration dimensions
mounting constraints
mounting point
mounting surface
mounting surface distortion
mounting surface stiffness
MR heads
MTBF
multimode drivers
mult imode receivers
multiple segment
multi-segmented cache control

7, 48

5

13, 14, 21

52, 56, 57

40

13

14

52

43

48

11

48

12

48, 49, 50

48

5

11

10, 11, 19, 67

13, 42

42

42

15

15

11

56, 57

22

20

19

19

See

MTBF

13

32

51

11, 12, 48

12

48, 49

67

27

42

42

11

12

N

noise 20

audible
nominal voltage
non-operating

temperature
non-operating vibration
nonshielded 50 conductor connector
nonshielded 68 conductor connector

3, 7

21

24, 26

22

26

27, 28, 29

56
57

O

office environment 26
operating
operating environment
operating option
operating parameter
operator intervention
option jumper
option jumper location
option select header
option select jumper
options
orientation
out-of-plane deflection
out-of-plane distortion
output voltage
overhead time

24, 26

33

8

10, 24, 41

68
10

33

48

52

33

14

13

33

42

42

P

package size 25

19

20

11

19

33

11

52

13

24

57

4

14

9

12

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

PCB circuit run
PD jumper
peak bits/inch
peak starting current
PERF
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 requirements
power sequencing
power supply voltage
power-carrying conductor
power-on
power-on operating hours
power-on reset
power-up
power-up hours

25

40

40

40

14, 33, 39, 40, 41, 42, 48, 52, 55

56, 58

40

9

55

22

temperature

15

26

52, 53, 54

19, 20, 40

19, 20

21

3

20

33, 39, 67

48

20, 40

14

,

Barracuda 9LP Product Manual, Rev. C 85

prefetch 11, 12

12

See

11, 12

12

13, 14

PCB

8

5

prefetch (read look-ahead)

12

12

11

11, 12

47

prefetch ceiling field

12

prefetch data
prefetch field
prefetch hit
prefetch mode
prefetch of contiguous blocks
prefetch operation
prefetch segmented cache control
preventive maintenance
printed circuit board.
PRML read channel electronics
product data page
programmable drive capacity

R

radio interference regulations 3

11

31

12

48

11

11

13

19

7

24

14

11, 12

13, 31
11

31

9

9

24

39

33

17

52

11

4

14

21

14

13

31

32

25

32

14

RC bit
RCD
RCD bit
read
read command
read continuous (RC) bit
read data
read error
read error rate
read operation
read power dissipation
read retry count
read/write head
ready
receive diagnostic results
recommended mounting
recording code
recoverable seek error
reference documents
regulation
relative h umidity
reliabilit y
reliability and service
reliability specifications
remote I D selection
remote switch
repair facility
repair information
REQ/ACK offset
request sense command
request sense information
resonance
retrieved data

S

S.M.A.R.T. 7, 15
safe power transmission

3

safety
saved value

48, 49

57

11

68

SCA
SCAM
SCSI

SCSI bus
SCSI bus cable
SCSI bus condition
SCSI bus I/O cable
SCSI bus ID
SCSI bus phase sequence
SCSI bus reset
SCSI command
SCSI Fast-2 0
SCSI Fast-4 0
SCSI I/O connector
SCSI I/ O te r minati on
SCSI ID
SCSI interface
SCSI interface cable
SCSI interface commands supported
SCSI interface connector
SCSI interface data
SCSI Interface Product Manual
SCSI systems error
SCSI systems error consideration
SCSI systems error management
SCSI-1 mode
SCSI-2
SCSI-2/SCSI-3
SCSI-2/SCSI-3 mode
SCSI-3 (Fast-20 and Fast-40) interface
SCSI-3 Parallel Interface-2 (SPI-2)
SE
SE drivers
Seagate support service
sector
sector interleave
sector size
sector transfer
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
SFF-8009

7, 33

commands
format commands
interface data transfer rate
messages

33, 40

4, 10

39, 40, 55, 71

11

See S.M.A.R.T.

13, 14

life
philosophy
tools

44

43

33

33

51
40

67

15

31
10
10

53, 54

19

10, 13, 55

56

10
32

44

49

44

15

9

7, 8, 10, 46

10

13, 14

14

11, 12

12

11

72

14

14

14

6

39

13

52

33

51

12

10

3, 4, 5

31

32

55

44

5

86 Barracuda 9LP Product Manual, Rev. C

SFF-8046 specification 4

8

21

7, 68

7, 68

12

52

75

10

13

15

68

52

15

68

75

SFF-8046, SCA-2 specification
shielding
shipping
shipping container
shock

shock mount
signal ground
single connection attachment (SCA)
single ended I/O

single unit shipping pack
single-ended drive
single-ended drivers
single-ended I/O
single-ended interface circuit
single-ended interface signals
single-ended SCSI driver
single-ended SCSI receiver
site installation
software interleave
source voltage
spare part
Spectrum Management Agency (SM A)
SPI
SPI-2
spindle
spindle startup
standard day
standards
start motor command
start unit command
start/stop time
status
status byte
STIR algorithm
stop spindle
Stop Spindle command
stop time
storage capacity
straight-in connector
strict bit in Mode page 00h
supply voltage
support services
synchronous data transfer
synchronous data transfer operation
synchronous data transfer period
synchronous transfer negotiation
synchronous transfer period
synchronous transfer rate
system chassis
system recovery procedures

3

17

22

24

42

42

24

61
62
65

and vibration

signal/contact assignment

50 conductor
68 conductor
80 conductor

68

15

40

14

12

69

14

4

4

20

40

21

3

19

40

10

32

10

8

11

15

11

31

58

19

77

42

4

T

TE jumper 33, 55, 68, 72

22

9

77

33, 58, 72

33, 72

72

technical support services
temperature

ambient
case
gradient
maximum case
non-operating
PCB and HDA
regulation

See also

terminated
termina tion

active
disc drive
initiator

terminator

active

passive
terminator circuit
terminator enable jumper TE
terminator power

source selection jum per TP
terminator requirements
termpower
TERMPW R
TP jumper
TP1 position
tracks/inch
tracks/surfa ce , to tal
transfer period
transfer rate
troubleshooting
typical access time

10, 21, 22, 41
21

21

21

22

22

3

cooling

20

20

72

72

72

33, 40, 58, 68

72

72

40, 68

40, 61, 69, 73

40

73

40, 55, 70

40

9

52

10

77

10

U

Ultra SCSI 4, 5, 7
unformatted
unrecoverable condition
unrecoverable error
unrecoverable seek error
Unrecoverable write error

8

13

13

14

13

V

vibration 24, 26

10

47

48

vital product data
volatile m emory
voltage
voltage margin

10, 19

W

wall/bracket mounted connector 56

12

8, 16

warranty
WCE

Barracuda 9LP Product Manual, Rev. C 87

wet bulb temperature 21

13

40

11

40

12

12

31

13

WP jumper
wrap-around
write caching
write error

unrecoverable
write operation
write protect
write retry count

X

X3.131-1994 4
X3T10/1071D
X3T10/1142D
X3T10/1143D
X3T10/855D

4
4, 55, 56, 58, 68, 69, 71
4, 73

4

Z

zoned bit recording (ZBR) 7

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

Publication Number: 77767517, Rev. C, Prin ted in USA