seagate ST34371N, ST34371W, ST34371WD, ST34371WC, ST34371DC Product Manual
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Barracuda 4LP Family:
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ST34371N/W/WD/WC/DC
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ST32171N/W/WD/WC/DC
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ST34571N/W/WD/WC/DC
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ST32271N/W/WD/WC/DC
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Product Manual, Volume 1
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Barracuda 4LP Family:
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ST34371N/W/WD/WC/DC
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ST32171N/W/WD/WC/DC
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ST34571N/W/WD/WC/DC
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ST32271N/W/WD/WC/DC
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Product Manual, Volume 1
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© 1998 Se agat e Technology, Inc. All rights reserved
Publication number: 77767491, Rev. D
February 1998
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 trademar ks of Seagate Technology, 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
Rev. A 11/18/96 D. Ashby/B. Norman All
Rev. B 06/09/97 D. Ashby/B. Norman 3, 4, 5, 7, 8, 10, 11, 15, 17, 19, 24, 31, 33,
34, 36, 45, 53, 56, 57, 67, 68, 71, 72, 73,
75 and 76.
Rev. C 07/29/97 K. Tan 10.
Rev. D 02/13/98 D. Ashby/B. Norman 15, 17, 21, 29, 75, and 76.
Notice.
Product Manual 77767491 is Volume 1 of a two Volume document with the SCSI Interface information in
the Vol ume 2 S CSI 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 4LP Product Manual, Rev. D vii
Contents
1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 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 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Unformatted and formatted capacit ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.6 Programmable drive capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7 Factory installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Options (factory installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.9 Accessories (user installed). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.0 Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics (transparent to user) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 SCSI Seek performance characteristics (visible to user). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format comm and exec ution 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 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6
5.2.1 Mean time bet ween failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.2 Preve ntive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.5 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.6 Hot plugging Barracuda 4LP disc drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.7 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.8 Product warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 12 V - Current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.3 Power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1
6.4 Environmental limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.1 Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
viii Barracuda 4LP Product Manual, Rev. D
6.4.3 Effective altitude (sea level). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.6 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.4.7 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.5 Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
7.0 Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.1 Drive internal defects and errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.2 SCSI systems errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1
8.1 Drive ID/option select header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1.1 Notes for Figures 7a, 7b, 7c, 7d, and 7e.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.1.2 Function description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
8.2 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
8.3 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
8.3.1 Air flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
8.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
8.5 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 0
9.0 Interface requiremen ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.1 General description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.2 SCSI interface messages supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.3 SCSI interface commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
9.3.1 Inquiry Vital Product data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
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 requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
9.6.4 Mating connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
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
Barracuda 4LP Product Manual, Rev. D ix
Figures
Figure 1. Barracuda 4LP family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Barracuda 4LP family drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Typical Barracuda 4LP family drive +5 V and +12 V current profile. . . . . . . . . . . . . . . . . . . . 20
Figure 4. Locations of PCB components listed in Table 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 5. Recommended mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 6a. Mounting configuration dimensions for models “N” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 6b. Mounting configuration dimensions for models “W” and “WD”. . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 6c. Mo unting confi guration dimens ions for models “WC” and “DC ”. . . . . . . . . . . . . . . . . . . . . . . 28
Figure 7a. Barracuda 4LP family drive ID select header for models “N”. . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 7b. Barracuda 4LP family drive ID select for models “W,” “WC,” “WD,” and “DC”. . . . . . . . . . . . 33
Figure 7c. Barracuda 4LP family drive ID select header J1-auxiliary for models “W” and “WD”
(J1-Auxiliary Pins 1A - 12A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 7d. Barracuda 4LP family drive option select header for models “N,” “W,” and “WD” . . . . . . . . . 35
Figure 7e. Barracuda 4LP family drive option select header for models “WC” and “DC” . . . . . . . . . . . . 35
Figure 8. Air flow (suggested) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 9a. Physical interface for “N” model drives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 9b. Model “W” and “WD” drive physical interface (68 pin J1 SCSI I/O connector). . . . . . . . . . . . 54
Figure 9c. Model “WC” and “DC” 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,” and “WD” 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” and “WD” models . . . . . . . . . . . . . 60
Figure 11c. Nonshielded 80 pin SCSI “SCA-2” connector, used on “WC” and “DC” models . . . . . . . . . . 61
Figure 12. Single-ended transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 13. Typical differential I/O line transmitter/receiver and external terminators . . . . . . . . . . . . . . . 70
Barracuda 4LP Product Manual, Rev. D 1
1.0 Scope
This manual describes the Seagate Technology®, Inc. Barracuda 4LP™ disc drives.
Barracuda 4LP drives suppor t the small computer system interface (SCSI) as descr ibed 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 4LP models is referred to as “the drive”
(unless references to individual models are necessary).
.
(part num ber 77738479) described general SC SI interface characteristics of this and
SCSI Inter-
*
*Model “N” version with 50 pin SCSI I/O connector
Figure 1. Barracuda 4LP famil y drive
Barracuda 4LP Product Manual, Rev. D 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 4LP Family complies with Seagat e sta ndards as noted in the appropriate sect ions of t his M anual and the Seagate SCSI Interface Manual, part number 77738479 (Vol. 2).
The Barracuda 4LP disc drive is a UL recognized com ponent per UL1950, CSA certified to CSA C22.2 No.
950-M89, 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.
2.1.1.1 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 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 M ay 198 9 as amended by Directive 92/31/EEC of 28 April 1992 a nd
Directive 93/68/EEC of 22 July 1993.
4 Barracuda 4LP Product Manual, Rev. D
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
Installation Guide Seagate P/N 77767492
SCSI Interface Manual Seagate P/N 77738479
ANSI small computer system interface (SCSI) document numbers:
X3.131-1994 SCSI-2
X3T10/855D rev. 15a SPI
X3T10/1071D rev. 6 Fast-20 (also called “Ultra SCSI”)
SFF-8046 Specification for 80-pin SCA 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.
Barracuda 4LP Product Manual, Rev. D 5
3.0 General description
Barracuda 4LP 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 4LP SCSI-3 Fast-20 (Ultra SCSI) models.
Table 1: Drive model number vs. differentiating features
Model number
Number
of Heads I/O circuit type
Number of I/O
connector pins
Number of I/O
data bus bits
ST34371N 10 single-ended 50 8
ST34371W 10 single-ended 68 16
ST34371WD 10 differential 68 16
ST34371WC 10 single-ended 80 16
ST34371DC 10 differential 80 16
ST32171N 5 single-ended 50 8
ST32171W 5 single-ended 68 16
ST32171WD 5 differential 68 16
ST32171WC 5 single-ended 80 16
ST32171DC 5 differential 80 16
ST34571N 10 single-ended 50 8
ST34571W 10 single-ended 68 16
ST34571WD 10 differential 68 16
ST34571WC 10 single-ended 80 16
ST34571DC 10 differential 80 16
ST32271N 5 single-ended 50 8
ST32271W 5 single-ended 68 16
ST32271WD 5 differential 68 16
ST32271WC 5 single-ended 80 16
ST32271DC 5 differential 80 16
The drive records and recovers data on 3.5-inch (86 mm) non-removeable discs.
The drive supports the S mall Computer System Interface (SCSI) as describ ed in the ANSI SCSI-2 interface
specifications to the extent described in this manual (volume 1), which defi nes the product performanc e characteristics of the Barracuda 4LP family of drives, and the
SCSI Interface Product Manual
(volume 2), part number 77738479, which describes the general interface characteristics of this and other families of Seagate SCSI
drives.
6 Barracuda 4LP Product Manual, Rev. D
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 4LP 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 4LP drives decode track 0 location data from the servo data embedded on each surface to eliminate
mechanical transducer adjustments and related relia bilit y con cer ns.
A high-performance actuator assembly with a low-inertia, balanced, pa tented, straight-arm design provides
excellent performance with minimal power dissipation.
Figure 2. Barracuda 4LP famil y drive
Barracuda 4LP Product Manual, Rev. D 7
3.1 Standard features
The Barracuda 4LP Family has the following standard features:
• Integrated SCSI controller
• Single-ended or 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 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 K byte data buffer
• Hot plug compatibility (section 9.6.4.3 lists proper host connector needed) for “WC” and “DC” model drives
• SCAM (SCSI Configured AutoMagically) plug-n-play level 1 compliant as shipped. Level 2 is a factory
installed option.
• Low audible noise for office environment
• Low power consumption
3.2 Media characteristics
The media used on t he drive has a d iameter 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 improved durability
and environmental protection.
3.3 Performance
• Supports industry standard Ultra SCSI interface (also called “Fast -20 SCSI”) [1]
• 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-Monitoring, Analysis and Repor ting Technology (S.M.A.R.T.)
• Incorporates Seek To Improve Reliability algorithm (STIR)
• 5-year warranty
[1] Note: Some host adapter companies support the term “Fast-20 SCSI.”
8 Barracuda 4LP Product Manual, Rev. D
3.5 Unformatted a n d formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows the standard OEM model capacities:
Formatted [1]
Data Block Size
512 Byte/Sector Unformatted
ST34371 4.35 GB [2] 5.31 GB
ST32171 2.16 GB [2] 2.65 GB
ST34571 4.55 GB [2] 5.54 GB
ST32271 2.26 GB [2] 2.77 GB
Notes.
[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block
size before issuing a forma t command and ob tain different formatted capacities than those listed. User
available capacity depends on spare reallocation scheme selected. See Mo de S elect C ommand and Format Command in the SCSI Interface Product Manual P/N 77738479.
[2] Sparing equivalent to eighty spare sectors per eight cylinder region. Spares are located at the end of each
sparing region.
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 I/O Product Manual, P/N 77738479, Rev. G. Refer to the Parameter list block
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 n umber 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 .
3.7 Factory installed accessories
OEM Standard drives are shipped with Installation Guide P/N 77767492 (unless otherwise 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 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.
• 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 Installation Guide (P/N 77767492) is usually includ ed wi th eac h st andard OE M dri ve shippe d, but extra
copies may be ordered.
• Level 2 SCAM compliance.
3.9 Accessories (user installed)
The following accessories are available. All accessories may be installed in the field.
• Single unit shipping pack.
Barracuda 4LP Product Manual, Rev. D 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
ST34371 ST32171 ST34571 ST32271
Drive Capacity 5.31 2.65 5.54 2.77 GByte (UNF, rounded off values)
Read/Write Heads 10 5 10 5
Bytes/Track 102,500 102,500 106 ,980 106,980 B ytes (Avg, rounded off values)
Bytes/Surface 531 531 554 554 Mbytes (UNF, rounded off values)
Tracks/Surface, Total 5,178 5,178 5,178 5,178 Tracks (user accessible)
Tracks/Inch 5,555 5,555 5,555 5,555 TPI
Peak Bits/Inch 123,000 123,000 128 ,000 128,000 B PI
Internal Data Rate 80-122 80-122 83-126 83-126 Mbits/sec (variable with zone)
Disc Rotational Speed 7,200 7,200 7,200 7,200 r/min
Average Rotational Latency 4.17 4. 17 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 of the B arracuda 4LP family unless otherwise s pecified.
Refer to Section 9.10 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
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
Max. [2]
10.8
11.3
Single Track – Typical [3] 2.0 2.1
Max. [2]
2.2
2.3
Full Stroke – Typical [ 3] 17.5 18.5
Max. [2]
20.0 20.5
*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.
10 Barracuda 4LP Product Manual, Rev. D
4.2.2 Format command execution time (minutes) [1]*
ST34371/ST34571 ST32171/ST32271
Maxim um (with verif y) 95 50
Maximum (no verify) 65 35
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]
9.5
13.2
15.0
MByte/sec
MByte/sec
MByte/sec
Data buffer trans fer rate to/from disc media: (< 1 tr ack):
Min. [4]
Avg. [4]
Max. [4]
MByte/sec divided by (interleave fac tor)
7.1
MByte/sec divided by (interleave fac tor)
10.2
MByte/sec divided by (interleave fac tor)
11.7
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).
Sector Sizes:
Default 512 byte user data blocks
Va riable 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 msec
Overhead time for one track cylinder switch in sequential mode <2.4 msec (typical)
Average rotational latency 4.17 msec
*[] Notes listed after Section 4.2.3.
Barracuda 4LP Product Manual, Rev. D 11
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 unde r nominal conditions of tempera ture, 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 + average seek time + latency time
4.3 S tar t/st op time
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor
Start Opt ion is disabled (i.e. the m otor star ts as soon as the power has be en 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 Opt ion 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 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
(see SCSI Interface Product Manual, 77738479).
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 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 SCSI Interface Product Manual,
77738479). Prefetch and cache operation are independent features from the standpoin t that each is enabled
and disabled independently via the Mode Sele ct 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 8a and 8b.
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 SCSI Interface Product Manual P/N 77738479), data requested by the host with a Read command is retrieved from the buffer (if it is there), before any disc access is initiated. If cache operation is not
enabled, the buffer (still segmented with required number of segments) is still used, but only as circular buffer
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 SCSI Interface Product Manual, 77738479.
12 Barracuda 4LP Product Manual, Rev. D
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 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 disconnec t/reconn ec t sp ecification 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
(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 selected on ly as a by-product of sele cting t he s egm ent num ber specification. The size in Kbytes of each segment is not reported by the Mode Sense command page 08h, bytes 14 and
15. The value 0XFFFF is always reported. If a size specification is sent by the host in a Mode Select command
(bytes 14 and 15) no new s egm ent s ize is s et up by the drive, and if the “S T RICT ” bit in Mode pag e 00h (byte
2, bit 1) is set to one, the drive responds as it does for any attempt to change unchangeable parameters (see
SCSI I/O Product Manual 77738 479). The dri ve supports operation of any intege r numbe r of segmen ts fr om 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 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 comm and. If there are, the respective cache segments a re cleared. 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 8a, 8b and 9a, 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 mmediately beyond that which
was requested by a Read command can be retrieved and stored in the buffer for immedi ate 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 prefe tch “hit”, not a “cache” operation “hit”. Prefetch is enabled using Mode Select page 08h,
byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch. Since data that is prefetched
replaces data already in some buffer segment(s), the host can limit the amount of prefetch data to optimize
system performance. The max prefetch field (bytes 8 and 9) limits the am ount of prefetch. The drive does not
use the prefetch “ceiling” field (byt e s 10 and 11).
Barracuda 4LP Product Manual, Rev. D 13
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 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, 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 4LP Product Manual, Rev. D 15
5.0 Reliability specifications
The following reliability specifications assume correct host/drive operational interface, including all interface
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).
Seek Errors
Less than 10 in 10
Read Error Rates [1]
Recovered Data Less than 10 errors in 10
Unrecovered Data Less than 1 sector in 10
Miscorrected Data Less than 1 sector in 10
MTBF 1,000,000 hours
Service Life 5 years
Preventive Maintenance None required
Note.
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.
5.1 Error rates
The error rates stated in this specification assume the following:
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).
• The drive has been formatted with the SCSI FORMAT commands.
• Errors caused by media defects or host system fail ures are excluded from error rate computations. Refer to
Section 3.2, “Media Characteristics.”
8
seeks
11
bits transferred (OEM default settings)
14
bits transferred (OEM default settings)
21
bits transferred
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 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 erro rs
Write errors can occur a s a result of media defects, environmental interference, or equipment malfunc tion.
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 4LP Product Manual, Rev. D
5.1.4 Seek errors
A seek error is defined as a failure of the drive to position the heads to the addressed t rack. There shal l be no
more than one recoverable seek errors in 10
7
physical seek operations. After detecting an initial seek error , the
drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning
error (15h) is reported with a Medium error (3h) or Hardware error (4h) reported in the Sense Key. This is an
unrecoverable seek error. Unrec overable seek errors are classified as failures for MTBF calculations. Refer to
Section 5.1.1.4 of SCSI-2 Interface Product Manual P/N 77738479 for Request Sense information.
5.2 Reliability and service
You can enhance the reliability of Barracuda 4LP 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 specified in Section 6.4.1, Table 3, Column 2 are not exceeded. Short-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 perio d 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 st affed service and repai r facility. Troubleshootin g 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.
Barracuda 4LP Product Manual, Rev. D 17
5.2.6 Hot plugging Barracuda 4LP 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 4LP drives conform to the SCSI-3 standard
requirements for glitch-free power-on and power-off. The drive maintains the high-impedance state of the
device connector contacts during a power cycle until the transceiver is enabled.
Note. The systems integrator must ensure that no temperature, energy, voltage hazard, or ESD potential is
presented during the hot connect/disconnect operation.
Procedure:
1. Configure 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 rec eivers 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 the 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 inser ting the dri ve, connect its power ground and logic ground at le ast 1 m illisecon d before
coming into contact with the bus conne ctor. 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 dr ive 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 electricity 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.
This feature not implemented by this drive family.
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 Sea gate’s Warranty Procedure. Seagat e
will pay for transporting the rep air or replacement item to customer. For more detailed warranty information
refer to the Standard terms and condition s of Purchase for Seagate products.
Shipping
When transpor ting or shipping a drive, a Seagate approved 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 recei pt of components improper ly 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.
18 Barracuda 4LP Product Manual, Rev. D
Product repair and return information
Seagate customer service cent ers 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.
Barracuda 4LP Product Manual, Rev. D 19
6.0 Physical/electrical specifications
This section provides information rela ting to the physical and electrical characteristics of the Barracuda 4LP
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 require me nts
ST34371/ST34571 ST32171/ST32271
N/W/WC
Notes
Single-ended
Vol tage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2]
Maximum operating current DC3σ [1] 0.81 0.95 1.21 0.95 0.81 0.85 1.21 0.85
Average idle current DCX
[1] 0.46 0.54 0.70 0.54 0.46 0.52 0.70 0.52
Maximum starting current
(peak DC) DC3σ
(peak AC) AC3σ
[3]
[3]
0.78 2.44
3.1
Delayed motor start (max) DC3σ [1][4] 0.48 0.20 0.90 0.20 0.50 0.20 0.90 0.20
Peak operating current
[1][6]
Typical DCX
Maximum DC3σ
Maximum (Peak) 3σ
[1][6]
0.75
0.81
1.5
0.76
0.95
2.5
WD/DC
Differential
1.1 2.44
3.1
1.05
1.21
2.0
0.76
0.95
2.5
N/W/WC
Single-ended
0.78 2.00
3.1
0.72
0.81
1.5
0.73
0.85
2.3
WD/DC
Differential
1.1 2.00
3.1
0.91
1.21
2.0
0.73
0.85
2.3
Notes.
[1] Measured with average reading DC ammeter. Instantaneous +12 V current peaks will exceed these val-
ues.
[2] A –10% droop is per missible during initial star t of spindle, and must return to ±5% before 7,200 r pm is
reached. The ±5% must be maintained after the drive signifies that its power-up sequence has been com-
pleted and that the drive is able to accept selection by the host initiator.
[3] See +12 V current profile in Figure 3.
[4] This condition occurs when the Motor 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 and SCSI discon-
nect enabled.
[7]
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. The +5 and +12 volt supplies shall employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive
power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.
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