seagate ST34572N, ST34572W, ST34572WD, ST34572WC, ST34572DC Installation Guide
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Barracuda 4XL Family:
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ST34572N/W/WD/WC/DC
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ST32272N/W/WD/WC/DC
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Product Manual, Volume 1
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Barracuda 4XL Family:
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ST34572N/W/WD/WC/DC
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ST32272N/W/WD/WC/DC
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Product Manual, Volume 1
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© 1997 Seagate Tech nology, Inc. All rights reserved
Publication number: 77767500, Rev. B
November 1997
Seagate , Seagate Technology , and the Seagate logo are registered trademarks of Seagate Technology, Inc. Barracuda, SeaFAX, SeaFONE, SeaNET, SeaTDD, and SeaBOARD are either
trademarks or registered trademarks of S eagate Technol ogy, Inc. or one of its subsidiaries. All
other trademarks or registered trademarks are the property of their respective owners.
Seagate reserves the right to change, without notice, product offerings or specifications. No part
of this publication may be reproduced in any form without written permission of Seagate Technol-
ogy, Inc.
Revision status summary sheet
Revision Date Writer/Engineer Sheets Affected
A Issue 03/26/97 L. Newman/A. Ukani 1/1, v thru viii, 1 thru 82.
B 11/04/97 L. Newman/A. Ukani 8, 9, 10, 28, 29, 30, 47, 49, 50, and 72.
Notice.
This manual is volume 1 of a two-volume document with the SCSI interface information in the Volume 2
SCSI Interface Product Manual
If you need the SCSI interf ace information, order the volume 2
number 77738479.
, part number 77738479.
SCSI Interface Product Manual
, part
Barr acuda 4X L P roduct Manual, Rev. B vii
Contents
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.2 Electromagnetic susceptibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Electromagnetic com pliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Media characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.4 Re liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Unformatted and formatted capacit ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Programmabl e drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Factory installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.9 Accessories (user installed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 SCSI Seek performance characteristics (visible to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format command execution time (minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2.3 Generalized performance characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5.2 Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.0 Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.2 Read errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.3 Write errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Re liability and serv ic e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.1 Mean time between failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.3 Servi ce life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.5 Servi ce tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.6 Hot plugging Barracuda 4XL disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.7 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.8 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2.3 12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3
6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
viii Barracuda 4XL Product Manual, Rev. B
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.4 Shock and vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.4.1 Shock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.4.2 Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7.1 Drive internal defects and errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
7.2 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.1.1 Notes for Figures 9, 10, 11, 12, and 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
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 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
9.2 SCSI interface messag es supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
9.3 SCSI interface command s 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 support ed . . . . . . . . . . . . . . . . . . . . . . . . .51
9.5 Synchronous data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
9.5.1 Synchronous 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 requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
9.6.3.1 S ingle-ended I/O circuits (“N” and “W” models). . . . . . . . . . . . . . . . . . .56
9.6.3.2 Differential I/O circuits (“WD” and “DC” models) . . . . . . . . . . . . . . . . . .56
9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
9.6.4.1 Ma ting connec tors for “N” models . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
9.6.4.2 Mating connectors for “W” and “WD” models . . . . . . . . . . . . . . . . . . . .57
9.6.4.3 Ma ting connec tors for “WC” and “DC” models. . . . . . . . . . . . . . . . . . . .57
9.7 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
9.7.1 Single-ended drivers/receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
9.7.2 Differential drivers/receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
9.8 Terminator requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
9.9 Terminator power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
9.10 Disc drive SCSI timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
10.0 Seagate technical support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Barr acuda 4X L P roduct Manual, Rev. B ix
Figures
Figure 1. Barracuda 4XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Barracuda 4XL family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Typical Barracuda 4XL family drive +5 V and +12 V current profile. . . . . . . . . . . . . . . . . . . . 22
Figure 4. Locations of printed circuit board (PCB) components listed in Table 3 . . . . . . . . . . . . . . . . . 24
Figure 5. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6. Mounting configuration dimensions for models “N” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 7. Mounting configuration dimensions for models “W” and “WD”. . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 8. Mounting configuration dimensions for models “WC” and “DC”. . . . . . . . . . . . . . . . . . . . . . . 30
Figure 9. Barracuda 4XL family drive ID select header for models “N” . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 10. Barracuda 4XL family drive ID select for models “W,” “WC,” “WD,” and “DC”. . . . . . . . . . . . 35
Figure 11. Barracuda 4XL family drive ID select header J1-auxiliary for models “W” and “WD”
(J1-Auxiliary Pins 1A - 12A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 12. Barracuda 4XL family drive option select header for models “N,” “W,” and “WD” . . . . . . . . . 37
Figure 13. Barracuda 4XL family drive option select header for models “WC” and “DC” . . . . . . . . . . . . 37
Figure 14. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 15. Physical interface for “N” model drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 16. Physical interface for “W” and “WD” model drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 17. Physical interface for “WC” and “DC” model drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 18. SCSI daisy-chain interface cabling for “N,” “W,” and “WD” model drives . . . . . . . . . . . . . . . . 58
Figure 19. Nonshielded 50 pin SCSI device connector used on “N” model drives . . . . . . . . . . . . . . . . . 59
Figure 20. Non-shielded 68 pin SCSI device connector used on “W” and “WD” model drives . . . . . . . . 60
Figure 21. Non-shielded 80 pin SCSI “SCA-2” connector, used on “WC” and “DC” model drives . . . . . 61
Figure 22. Single-ended transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 23. Typical differential I/O line transmitter/receiver and external terminators . . . . . . . . . . . . . . . 70
Barr acuda 4X L P roduct Manual, Rev. B 1
1.0 Scope
This manual describes the Seagate Technology®, Inc. Barracuda 4XL™ disc drives.
Barracuda 4XL drives suppor t the small computer system interface (SCSI) as describe d in the ANSI SCSI,
SCSI-2, and SCS I-3 (Fast-20) interface specifications to t he extent descr ibed in this manual. The
face Product Manual
other families of Seagate drives.
From this point on in this product manual the reference to Barracuda 4XL models is referred to as “the drive”
(unless references to individual models are necessary).
.
(part number 77738479) describes general SCSI interface characteristics of this and
SCSI Inter-
*
*Model “N” version with 50 pin SCSI I/O connector
Figure 1. Barracuda 4XL famil y drive
Barr acuda 4X L P roduct Manual, Rev. B 3
2.0 Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction. The
drive depends upon its host eq uipment to provide adeq uate power and environment in order to a chieve optimum performance and c ompliance 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 mo unte d 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
Barracuda 4XL family drives comply with Seagate standards as noted in the appropriate sections of this manual and the Seagate
Barracuda 4XL disc drives are UL recognized components per UL1950, CSA certified to CSA C22.2 No. 950M89, and VDE certified to VDE 0805 and EN 60950 .
2.1.1 Electromagnetic compatibility
The drive, as delivered, is designed f or system integration and installation into a suitable enclosure prior to use.
As such the drive is supplied as a subassembly and is not subject to 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 does not provide adequate shielding. If the I /O cables are external t o
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 assembly, the drive is not required to meet any susceptibility performance requirem ents. It is
the responsibility of those integrating the dri ve within their system s to perform thos e tes ts req uired a nd desig n
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 performance of the drive. See Section 5.1.1 and Table 2, DC power requirements.
2.2 Electromagnetic compliance
Seagate uses an independen t laboratory to confirm compliance 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 model complies to the directives/standard(s), we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance
and provide CE Marking and C-Tick Marking for their product.
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European Union requirements of the Electromagnet ic
Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.
4 Barracud a 4X L Product Man ual, Rev. B
Australian C-Ti ck
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995
and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Management Agency (SMA).
2.3 Reference documents
Barracuda 4XL Installation Guide: Seagate P/N 77767501
SCSI Interface Product Manual: Seagate P/N 77738479
ANSI Small Computer System Interface (SCSI): ANSI3.131-1986 (X3T9/84.40 Rev. 1B)
(X3T9.2/82-2 Rev. 17B), X3T9.2/86-109 Revision 10H (SCSI-2), X3T9.2/91/010 Rev. 10 (SCSI-3) parallel interface, X3T9.2-184 Rev. 4 (SCSI-3) and ANSI SCSI-3 Fast-20, X3T10/1071D.
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: Seagate P/N 30553-001
In case of conflict between this document and any referenced document, this document takes precedence.
Barr acuda 4X L P roduct Manual, Rev. B 5
3.0 General description
Barracuda 4XL drives combine magnetoresistive (MR) heads, partial response/maximum likelihood (PRML)
read channel electronics, embedded servo technology, and a SCSI-3 (Fast-20) interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.
Fast-20 (also known as Ultra SCSI) is a negotiated transfer rate. This transfer rate will occur only if your host
adapter also supports Fast-20 data transfer rates. This drive also operates at SCSI-1 and SCSI-2 data transfer
rates for backward compatibility with non-Fast-20 capable SCSI host adapters.
Table 1 lists the features that differentiate the various Barracuda 4XL SCSI-3 Fast-20 (Ultra SCSI) models.
Table 1: Drive model number vs. differentiating features
Number
Model number
ST34572N 8 single-ended 50 8
ST34572W 8 single-ended 68 16
ST34572WD 8 differential 68 16
ST34572WC 8 single-ended 80 16
ST34572DC 8 differential 80 16
ST32272N 4 single-ended 50 8
ST32272W 4 single-ended 68 16
ST32272WD 4 differential 68 16
ST32272WC 4 single-ended 80 16
ST32272DC 4 differential 80 16
The drive records and recovers data on 3.5-inch (86 mm) non-removeable discs.
The drive suppor ts the Small Computer System Interface (SCSI) as describ ed in the ANSI SCSI-2 interface
specifications to the extent described in this manual (volume 1), which defines the product perform ance characteristics of the Barracuda 4XL family of drives, and the
ber 77738479, which describes the general interface characteristics of this and other families of Seagate SCSI
drives.
of heads I/O circuit type
Number of I/O
connector pins
Number of I/O
data bus bits
SCSI Interface Product Manual
(volume 2), part num-
The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and
automatic features that relieve the host from the necessity of knowing the physical characteristics of the targets
(logical block addressing is used).
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a nonreplaceable filter to maintain a contamination-free HDA environment.
Refer to Figure 2 for an exploded view of the drive. This exploded view is for information only—never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, med ia, actuator, etc.) as this
requires special facilities. The drive contains no replaceable parts. Opening the HDA voids your warranty.
Barracuda 4XL drives use a dedic ated landi ng zone at the innermost 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 automatical ly disenga ges when power is appli ed to the drive and
the head load process begins.
6 Barracud a 4X L Product Man ual, Rev. B
Barracuda 4XL drives decode track 0 location data from the servo data embedded on each surface to eliminate
mechanical transducer adjust m ents and re lated r eliability concerns.
A high-performance actuator ass embly with a low-inertia, balanced, pa tented, straight-arm design provides
excellent performance with minimal power dissipation.
Figure 2. Barracuda 4XL famil y drive
Barr acuda 4X L P roduct Manual, Rev. B 7
3.1 Standard features
The Barracuda 4XL family has the following standard features:
• Integrated SCSI controller
• Single-ended and differential SCSI drivers and receivers
• 8 bit and 16 bit I/O data bus models available
• Asynchronous and synchronous data transfer protocol
• Firmware downloadable via SCSI interface
• Selectable even byte sector sizes from 180 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)
• 128-bit Reed-Solomon error correcting code
• Sealed head and disc assembly
• No preventative maintenance or adjustment required
• Dedicated laser textured head landing zone
• Embedded servo data rather than a separate servo data surface
• Self diagnostics performed when power is applied to the drive
• 1:1 Interleave
• Zoned bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• Active IC terminators enabled by jumpers (“N” and “W” models only)
• 512 K byte data buffer
• Hot plug compatibility (section 9.6.4.3 lists the proper host connector needed) for “WC” and “DC” drives
• SCAM (SCSI Configured AutoMagically) plug-n-play level 2 compliant
• Low audible noise for office environment
• Low power consumption
• Audio Visual (A/V) ready
3.2 Media characteristics
The media used on the drive has a diameter of approximately 3.5 inches (86 mm). The aluminum substrate is
coated wi th a thin film mag net ic mat eria l, overcoat ed wit h a prop rie tar y pro tective layer for improved d urabilit y
and environmental protection.
3.3 Performance
• Supports industry standard Ultra SCSI interface (also called “Fast -20 SCSI”)
• Programmable multi-segmentable cache buffer
• 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-Monit orin g, Analysis and Reporting Technology (S.M.A.R.T.)
• Incorporates Seek To Improve Reliability algor ithm (STIR )
• 5-year warranty
8 Barracud a 4X L Product Man ual, Rev. B
3.5 Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table sho ws the st andard OEM model read capacity data. Total LBAs = read capacity data
shown below + 1.
Formatted [1]
data block size
Model
ST34572 87A25Bh (4.55 GB) 6.5 GB 118 spares per six cylinder region
ST32272 436F87h (2.26 GB) 3.25 GB 59 spares per six cylinder region
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 ob tain different formatted capacities than those listed. User
available capacity depends on spare reallocation scheme selected. See Mo de S elect Comm and a nd Format Command in the
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
descriptor, bytes 1, 2 and 3. A value of zero in bytes 1 , 2 and 3 indicat es that the drive shall not change the
capacity it is currently formatted to have. A number in bytes 1, 2 and 3 that is less than the maximum number of
LBAs changes the total drive capacity to the value in the block descriptor bytes 1, 2 and 3. A value greater than
the maximum number of LBAs is rounded down to the maximum capacity .
512 byte/sector Unformatted Sparing
SCSI Interface Product Manual
SCSI Interface Product Manual
(part number 77738479).
(part number 77738479). Refer to the Parameter list bl oc k
3.7 Factory installed accessories
OEM Standard drives are shipped with
erwise specified. The factory also ships with the drive a small bag of the two jumper plug types used for the J6,
J2, and J1-Aux option select jumper headers.
3.8 Options (factory installed)
All customer request ed options are incor porated during prod uction or packaged at the manufactur ing facility
before shipping. Some of the options available are:
• The capacities shown in Section 3.5. You can order other capacities by selecting other sparing schemes and
sector sizes.
• Single unit shipping pack. The drive normally ships in bulk packaging to provide maximum protection against
transit damage. Units shipped ind ividually require additional p rotection as provided by the s ingle unit shipping pack. Specify this option if you are planning to ship single units to your customers.
• The
3.9 Accessories (user installed)
The following accessories are available. Qualified individuals can install these accessories in the field.
• Front panel kit (with green rectangular LED lens), part number 73501451.
• Single unit shipping pack.
•
Barracuda 4XL Installation Guide
drive. You may order additional copies of this publication.
Barracuda 4XL Installation Guide
Barracuda 4XL Installation Guide
(part number 777 67501) i s u sually in cluded wi th e ach s tandard OE M
(part number 77767501).
(part num ber 77767501) unless oth-
Barr acuda 4X L P roduct Manual, Rev. B 9
4.0 Perfo rmance characteristics
4.1 Internal drive characteristics (transparent to user)
ST34572 ST32272
Drive Capacity 6.5 3.25 GByte (unformatted)
Read/Write Heads 8 4
Bytes/Track 124,000 124,000 Bytes (average, unformatted)
Bytes/Surface 812.5 812 .5 Mbytes (unformatted)
Tracks/Surface, Total 6,311 6,311 Tracks (user accessible)
Tracks/Inch 6,800 6,800 TPI
Peak Bits/Inch 139,209 139,209 BPI
Internal Data Rate 92-140 92-140 Mbits/sec (variable with zone)
Disc Rotational Speed 7,200 7,200 r/min
Average Rotational Latency 4.17 4.17 ms
4.2 SCSI Seek performance characteristics (visible to user) [6]*
The values given in Section 4.2.1 apply to all models o f the Barracuda 4XL family unless otherwise s pecified.
Refer to Section 9.10 and to the
details.
SCSI Interface Product Manual
(part number 77738479 ) for additional timing
4.2.1 Access time [8]
Including Controller Overhead
(without disconnect) [1] [4]
Drive Level
Read Write
ms
Average – Typical [3] 9.4 10.4
Maximum [2] 10.8 11.9
Single Track – Typical [3] 1.7 1.8
Maximum [2] 1.8 1.9
Full Stroke – Typical [ 3] 16.7 17.7
Maximum [2] 19.7 20.2
*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.
10 Barracuda 4XL Product Manual, Rev. B
4.2.2 Format command execution time (minutes) [1]*
ST34572 ST32272
Maxim um (with verif y) 95 50
Maximum (no verify) 65 35
4.2.3 Generalized performance characteristics
Minimum sector interleave 1 to 1
Data buffer transfer rate to/from disc media (one 512-byte sector):
Min. [4]* 11.5 MByte/sec
Avg. [4] 15.5 MByte/sec
Max. [4] 17.5 MByte/sec
Data buffer transfer rate to/from disc media: (< 1 track):
Min. [4] 7.86 MB yte/sec divided by (interleave factor)
Avg. [4] 11.0 MB yte/sec divided by (interleave factor)
Max. [4] 12.5 MByte/sec divided by (interleave factor)
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 SCSI): 1.25 to 20 Mbytes/sec
(8 bit data bus models)
Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI): 2.5 to 40 Mbytes/sec
(16 bit data bus models)
Synchronous transfer rate for fast SCSI-2: 1.25 to 10 Mbytes/sec
(8 bit data bus models)
Synchronous transfer rate for fast SCSI-2: 2.5 to 20 Mbytes/sec
(16 bit data bus models).
Secto r Sizes:
Default 512 byte user data blocks
Var iable 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 us ed .
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 msec
Overhead time for one track cylinder switch in sequential mode <2.4 msec (typical)
Average rotational latency 4.17 msec
*[] Notes listed at end of Section 4.2.3.
Barr acuda 4X L P roduct Manual, Rev. B 11
Notes for Section 4.2.
[1] Execution time is measured from receipt of the last Byte of the Command Desc riptor Block (CDB) to th e
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 temperature, 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 acce ss times are meas ured under nom inal conditions of temperat ure, 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 support the rates listed and no cable loss.
[7] Simulated.
[8] Access time = controller overhead + average seek time
Access to data = controller overhead + average seek time + latency time
4.3 Start/stop time
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor
Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error
condition is detected during the star t sequence, the drive executes a recovery procedure which may cause the
time to become ready to exceed 20 seconds. During spin up to read y time the drive responds to some commands over the SCSI interface in less than 3 seconds after application of power. Stop time is less than 20 seconds from removal of DC power.
If the Motor Start Option is enabled, the internal cont roller accepts the comm ands listed in the SC SI Interface
Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has
been received the drive becomes ready for normal operations within 13 seconds typically (excluding an error
recovery procedure). The Motor Start Command can also be used to command the 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 bu ffer storage space when
it is used in “cache” operat ions. To sele ct prefetch and cache features the hos t sends the Mo de Select 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 t his
drive family are given in Tables 8 and 9.
4.5 Cache operation
In general, 480 Kbytes of the 512 Kbytes of physical buffer space in the drive can be used as storage space for
cache operations. The buffer can be divided into logical segments (Mode Select Page 08h, byte 13) from which
data is read and to which data is written. The drive maintains a table of logical block disk medium addresses of
the data stored in each segment of the buffer. If cache operation is enabled (RCD bit = 0 in Mode Page 08h,
byte 2, bit 0. See
Read command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation
is not enabled, the buffer (still seg mented with required number of segm ents) is s till used, but onl y as circu lar
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 som e buffer segment on the way to the host. On a cache
SCSI Interface Product Manual
, part number 77738479).
SCSI Interface Product Manual
(par t number 7773847 9), data request ed by the ho st with a
,
12 Barracuda 4XL Product Manual, Rev. B
“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
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 the requested LB is reached that is not in any cache segment, the drive fetches it and any remaining
requested LBs from the di sc and puts them in a segment of the cache. The drive transfers the rem aining
requested LBs from th e cac he to the hos t in accorda nc e with t he disconnec t /reconn ect spe cification 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 d rive fetches the requested LB’s from the disc and transfers them into a segment, and from t here 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 prefe tch operation (if enabled), even when cache operation is disabled
(see Section 4.5.2). The number of segm ents may be selected using the M ode Select com mand, but the size
can not be directly selected. Size is selected only as a by-product of selecting the segment number specification. The size in Kbytes of each segment is reported by the Mode Sense command page 08h, bytes 14 and 15.
If a size specification is sent by the host in a Mode Select command (bytes 14 and 15) no new segment size is
set up by the drive, and if the “STRICT” bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as
it does for any attempt to change unchangeable parameters (see
77738479). The drive supports operation of any integer number of segments from 1 to 16.
SCSI Interface Product Manual
(part number 77738479).
SCSI Interface Product Manual
, part number
4.5.1 Caching write data
Write caching is a write operation by the d rive tha t makes use of a d r ive buffer storage area where the dat a t o
be written to the medium is stored in one or more segments while the drive performs the write command.
Write caching is enabled along w ith read c aching. For write caching, the s am e buffer space and segment ation
is used as set up for read functions. The buffer segmentation scheme is set up or changed independently , having nothing to do with whether or not read and write caching is enabled or disabled. When a write command is
issued, 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 com mand. If there are, the re spective cache segments are c leared. The
new data is cached for subsequent Read commands.
If the number of write data logical blocks exceeds the size of the segment being written into when the end of
the segment is reached, the data is written into the beginning of the same cache segment, overwriting the data
that was written there at the beginning of the operation. Howev er, the drive does not overwrite data that has not
yet been written to the medium.
Tables 8 and 9 show Mode default settings for the drives.
4.5.2 Prefetch operation
If the Prefetch feature is enabled, data i n cont igu ous lo gical blocks on the disc imm edi ately beyond that which
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 prefet ch “hit”, not a “cache” operation “hit”. Prefetch is enabled using Mode Select page 08h,
byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched
replaces data already in some buffer segment(s), the host c an limit the amount of prefetch data to optimize
Barr acuda 4X L P roduct Manual, Rev. B 13
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 (bytes 10 and 11).
During a prefetch operation, the drive crosses a cylinder bo undary to fetch more data only if the Discont inuity
(DISC) bit is set to one in bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous blocks
from the disc when it senses t hat a prefetch “hit” will likely occur, even if two consecutive read operations were
not for phy si cally contiguous blocks of data (e.g. “software interleave”). ARLA disables prefetch when it decides
that a prefetch “hit” will not likely occur. If the host is not using software interleave, and if two seque ntial read
operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read operations request contiguous blocks of data, ARLA keeps prefetch enabled.
Barr acuda 4X L P roduct Manual, Rev. B 15
5.0 Reliability specifications
The following reliabilit y specifications assume correct host/dri ve operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).
Seek Errors
Less than 1 in 10
Read Error Rates [1]
Recovered Data Less than 10 errors in 10
Unrecovered Data Less tha n 1 sector in 10
Miscorrected Data Less than 1 sector in 10
MTBF 1,000,000 hours
Service Life 5 years
Preventive Maintenance None required
Note.
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1 Error rates
The error rates stated in this specification assume the following:
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
• The drive has been formatted with the SCSI FORMAT commands.
• Errors caused by media defects or host system failures are excluded from error rate computations.
7
seeks
11
bits transferred (default settings)
14
bits transferred (default settings)
21
bits transferre d
5.1.1 Environmental interference
When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance
of the drive within the system shall be c onsidered acce ptable if the drive does not generate a n 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 f ault 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 verified as being written correctly on
the m edia.
• All media defect induced errors must be excluded from error rate calculations.
5.1.3 Write erro rs
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 a write error unrecoverable 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 (excluding media defects).
16 Barracuda 4XL Product Manual, Rev. B
5.1.4 Seek errors
A seek error is defined as a failure of the drive to position the heads to the address ed tra ck. There shall be no
8
more than ten recoverable seek errors in 10
physical seek operations. After detecting an initial seek error, the
drive automatically reseeks to the addressed track up to 3 times. If a reseek is successful, the Extended Sense
reports a s eek pos itioning error (15h), no seek compl ete error (02h), or t rack follow error (09h), and the sens e
key reports a recovered error (1h). If all three reseeks fail, a seek positioning error (15h) is repor ted with a
Medium error (3h) or Hardware error (4h) reported 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
Interface Product Manual
(part number 77738479) for Request Sense information.
SCSI
5.2 Reliability and service
You can enhance the reliability of Barracuda 4XL disc drives by ensuring that the drive receives adequate cooling. Section 6.4.1 provides temperature measurements and other information that may be used to enhance the
service life of the drive. Section 8.3.1 provides recommended air-flow information.
5.2.1 Mean time between failure
The production disc dri ve shall achieve an MTBF of 1,000,000 hours w hen operated in an environment that
ensures the case temperatures spec ified in Section 6.4.1 are not exceeded. Shor t-term excursions up to the
specification limits of the operating environment will not affect MTBF performance.
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 period of six months.
Drive failure means any stoppage or substandard performance caused by drive malfunction.
5.2.2 Preventive maintenance
No routine scheduled preventive maintenance shall be required.
5.2.3 Service life
The drive shall have a useful service life of five years. Depot repair or replacement of major parts is permitted
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 s taffed service and r epair facility. Trou bleshooting 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 voided 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.
Barr acuda 4X L P roduct Manual, Rev. B 17
5.2.6 Hot plugging Barracuda 4XL disc drives Caution: Hot -plug drives are not designed for simultaneous power disconnection and physical removal.
During power-up and power-down periods, the hot SCSI connect/disconnect capability does not produce
glitches or any corruptions on an active SCSI bus. Barracuda 4XL drives conform to the SCSI-3 standard
requirements for glitch-free power-on and power-off. The drive maintains the high-impedance state at the
device connector contacts during a power cycle until the transceiver is enabled.
Note. The s ystems integrator mus t ensure that no tempe rature, energy, or voltage hazard is presented dur-
ing the hot connect/disconnect operation.
Procedure:
1. Conf igure the drive with no connection between the drive and the TRMPWR signal on the SCSI bus. To
accomplish this, remove all jumpers from connector J2 pins 1, 2, 3, and 4.
2. Ensure that all SCSI devices on the bus have receivers that conform to the SCSI-3 standard.
3. Eliminate all I/O processes for the drive.
4. Wait until the drive motor and discs have come to a complete stop prior to changing the plane of operation,
ensuring data integrity.
5. Insert or remove the drive after meeting the following conditions:
Caution: Do not hot-plug th e first or last device on the SCSI bus (the SCSI bus termination must be external
to the drive you are inserting or removing).
a. If you are inse rt ing the dr ive, connect its power ground and logic ground at least 1 millisecon d before
coming into contact with t he bus connector. Maintain these ground connections d uring and after connecting the device to the bus.
b. If you are removing the device, maintain its power ground and logic ground connection for at least
1 millisecond after disconnecting the device from the bus.
c. You may simultaneously switch the power to the el ectronics and mechani cs of the drive with the bus
contacts, if the power distribution system is able to maintain adequate power stability to other devices
during the transition and if you have met the grounding requirements given in steps 5a and 5b.
d. Ensure that the drive carrier discharges all static e lectricity prior to inserting the drive into the system .
Note. Do not remove or add terminator power or resistance to the SCSI bus while hot plugging a disc drive.
5.2.7 S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitor ing Analysis and Re por ting Technology. This t echnology is intended
to recognize conditions that indicat e immine nt drive failure, and provide sufficient warn ing of a failure to allow
data back-up.
Note. The firmware will monitor spe cific attributes for degradation over time but can ’t predict instantan eous
drive failures.
Each attribute has been selected to mo nitor a spec ific set of failure conditions in the operat ing pe rformanc e of
the drive, and the thresholds are optimized to minimize “false” and “failed” predictions.
Controlling S.M.A.R.T.
The operating mode of SMART is controlled by the DEXCPT bit and the PER F bit of the “Inform ational Exc eptions Control Page” (1Ch). The DEXCP T bit is used to en able 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 operation s. When the PERF bit is set, the drive is considered to be in “On-line
Mode Only” and will not perform off-line func tions.
The process of measuring off-line attributes and saving data can be forced by the RTZ command. Forcing
S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.
The drive can be interrogated by the host to determine the time remaining before the next scheduled measurement and data logging process will occur. This is accomplished by a log sense command to log page 0x3E.
18 Barracuda 4XL Product Manual, Rev. B
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 is saved to the disc for the purpose of recreating the events that caused a predictive
failure. The drive measures and saves parameters once every two hours subject to an idle period o n the SCS I
bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable. The maximum delay is summarized below.
Maximum processing delay
On-line only del ay Fully enab le d delay
S.M.A.R.T. delay times 60 milliseconds 450 milliseconds
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 “hos t” an 01-5D00 sense code with the following FRU values returned by the
Request Sense command when a predict ive failure threshold is reache d. The error code is preserved through
bus resets and power cycles.
Predictive failure FRU codes
Attribute FRU code Predictive failure description
LBA reassignment 04 (01-5D04) LBA reassignment exceeding limits
Seek errors 43 (01-5D43) Seek error rate exceeding limits
Spinup errors 5B (01-5D5B) Spinup retry count exceeding limits
General failure EF (01-5DEF) Missing S.M.A.R.T. control information
Reassignment. When a reassignment (reallocation) is performed, the code determines the percentage of
entries still available in the Reallocation Table (RTB). If the pe rcentage of entries left falls below a predetermined threshold value, a predictive fa ilure is signaled .
Seek errors. Seek error rates are estimated on a per-head basis. For every seek, a seek interval counter is
incremented and for every seek error a seek failure counter is incremented. If the seek error rate exceeds a
predetermined threshold, the Seek Failure History counter is decremented (minimum value of zero). If the seek
error rate is below a predetermined threshold, the Seek Failure History counter is incremented. Whenever a
seek failure history count er changes, the corresponding Seek I nterval counter and the seek failure counters
are reset to zero, and a smoothing algorithm is performed. The fir mware checks the Seek Failure counter for
each head to determine the Seek Failure History counter with the largest value. The firmware will issue predictive failure if any single seek failure history counter has reached a predete rm in ed threshol d value.
Spinup errors. This attribute measures the “actuator buzz rate,” the number of actuator buzzes versus the
number of drive spinups. If a drive fails to spinup using a normal spinup routine, if issues a level 1 and then
level 3 actuator buzz to overcome drive stiction. For every spinup a spinup interval counter is incremented. If
the servo firmware issues a level 1 or a level 3 actuator buzz command, the Spinup Failure counter adds a 1 or
a 3 respectively. If the actuator buzz rate is below a predetermined threshold, the Spinup Failure History
counter is decremented (minimum value of zero). If the actuator buzz rate is above a predetermined threshold,
the Spinup Failure History counter is incremented.
When the Spinup Failure History counter changes, the S pinup Interval and the Spinup Failure counters are
reset to zero and a smoothing algorithm is performed. The drive issues a predictive failure if the Spinup Failure
History counter has reached a predetermined threshold value.
5.2.8 Product warranty
Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that
each product (including components and subassemblies) or spare part that fails to function properly under normal use due to defect in materials on workmanship or due to nonconformance to the applicable specifications
will be repaired or replaced, at 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 Seagate’s Warranty Procedure. Seagate
will pay for transporting the rep air or replacement item to customer. For more detailed warranty information
refer to the Standard terms and conditions of Purchase for Seagate products.
Barr acuda 4X L P roduct Manual, Rev. B 19
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 Packag e label. Shipping a drive in a non-approved container voids the drive warranty .
Seagate repair centers may refuse receip t o f 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 cente rs are the only facilities authorized to service Seagate drives. Seagate does
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory-seal voids
the warranty. See Section 10.0.
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