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ST34371FC
Product Manual
72 pgs1.01 Mb0
Installation guide
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Table of contents
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seagate ST32171FC, ST34371FC, ST34571FC Product Manual

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Barracuda 4LP FC Disc Drive

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ST32171FC, ST34371FC, ST34571FC

Product Manual, Volume 1

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Barracuda 4LP FC Disc Drive

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ST32171FC, ST34371FC, ST34571FC

Product Manual, Volume 1

© 1997 Seagate Technology, Inc. All rights reserved April 1997
Publication number: 77767494 , Rev. A
No part of this publication may be reproduced in any form without written permission from
Seagate Technology, Inc.
Printed in the United States of America

Revision status summary sheet

Revision Date Writer/Engineer Sheets Affected
A 04/23/97 L. Newman/R. Metzner All
Barracuda 4LP FC Product Manual, Rev. A v

Contents

1.0 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.0 Applicable standards and reference documentati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1 Electromagnetic com pati bili ty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.2 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Electromagne tic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 General descri p tion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Standard features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.4 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.5 Unformatt ed and formatted capacit ies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Factory-installed accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.7 Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.8 User-installed accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.0 Performa nce cha racteri sti c s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Internal drive characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Seek performance characteristi cs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.1 Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2.2 Format command executi on tim e for ≥ 512-byte sectors . . . . . . . . . . . . . . . . . . . . . 9
4.2.3 General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Start/st op tim e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4 Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Cache operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5.1 Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.0 Reliabil ity sp eci ficati on s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.1 Environmental interference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.2 Interface errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.3 Write errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.4 Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Reliability and service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3.1 Mean time between failure (MT BF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3.2 Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3.3 Service life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3.4 Service philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.5 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.6 Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.7 Hot plugging the drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.0 Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 AC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 DC power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2.1 Conducted noise immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2.2 Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 0
6.2.3 12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.3 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4 Environmenta l limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.1 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.2 Relative humidit y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.3 Effective altitude (sea level reference) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
vi Barracuda 4LP FC Produ ct Man ual , Rev. A
6.4.4.1 Shock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.4.4.2 Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.4.5 Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.5 Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.6 Mechanical specif icati ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
7.0 Defect and error man agem e nt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
7.1 Drive internal defects/errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
8.0 Installati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8.1 Drive ID/option s electi on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8.2 LED connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
8.2.1 J6 connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.3 Drive orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.4 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
8.4 . 1 A i r fl o w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.5 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.6 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
9.0 Interface requiremen t s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9.1 FC-AL feat ures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9.1.1 Fibre Channel link service frame s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9.1.2 Fibre Channel task management functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9.1.3 Fibre Channel task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
9.1.4 Fibre Channel port login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
9.1.5 Fibre Channel port login accept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.6 Fibre Channel Proce ss Login (PRLI ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.7 Fibre Channel Proce ss Accep t (ACC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1.8 Fibre Channel Arbitrated Loop options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
9.2 Dual port support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
9.3 SCSI interface command s supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
9.3.1 Inquiry data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
9.3.2 Mode Sense data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
9.4 Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.5 FC-AL physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5.1 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5.1.1 Physical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5.2 Connector requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.5.3 Electrical description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.5 . 4 P i n d e s cr iptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.5.5 FC-AL transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.5.6 P ower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.5.7 Fault LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5.8 Active LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5.9 – Enable Bypass Signal Port A - Port B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
9.5.10 Motor start controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.5 . 1 1 S E L I D line s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
9.6 Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.1 TTL input characteristic s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.2 LED driver signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.3 Differential PECL out put . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
9.6.4 Differential PECL input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
10.0 Seagate technical support servi ces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3
Barracuda 4LP FC Product Manual, Rev. A vii

List of Figures

Figure 1. Barracuda 4LP FC family disc drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Barracuda 4LP FC disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Typical Barracuda 4LP FC drive +12V current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 4. Mounting confi gurati on dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 5. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 6. LED indicator connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 7. Air flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 8. PCB temperature measurement locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 9. HDA case temperature measurem ent locat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 10. Physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 11. Port bypass circuit physical interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 12. FC-AL SCA device connector dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 13. J6 connector dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 14. FC-AL transmitters and receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 15. Transmit eye diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 16. Receive eye diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Barracuda 4LP FC Product Manual, Rev. A 1

1.0 Scope

This manual describes Seagat e® BarracudaTM 4LP FC (Fibre Channel) disc drives. Barracuda 4LP FC drives support the Fibre Channel Arbitrat ed Loop and SCS I Fibre Channel Pro tocol specif i-
cations to the extent described in this manual. T he describes the general Fibre Channel Arbit rated Loop characteristics of this and other Seagate F ibre Channel drives.

Figure 1. Barracuda 4LP FC family disc drive

Fibre Channel Interface Manual
(part number 77767496)
Barracuda 4LP FC Product Manual, Rev. A 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 equipm ent to provide adequate power and environment in order to achieve opti­mum performance a nd compliance with applicable industry and g overnmental regulations. Special atte ntion must be given in the areas of safety, power distribution, shielding, audible noise control, and temperat ure reg­ulation. In particular, the drive must be securely mounted in order to guarantee the specified performance char­acteristics. Mounting by bott om holes must meet the requirem ents o f Section 8.5.

2.1 Standards

The Barracu da 4LP FC family co mplies with Seagate standards as noted in the appropriate sections of this manual and the Seag ate
The Barracuda 4LP FC disc drive is a UL recognized component 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 for s ystem integration and i nstallation into a suitable enclosure prior to use. As such the drive is suppl ied as a subassembly and is not subject to Subpart B o f Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the Canadian Departmen t of Communica­tions.
The design characteristics of the drive serve to minimize radiation when inst alled 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 shiel ding. If the I/O cables are ext ernal to the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con­troller.
Fibre Channel Interface Manual
, part number 77767496 (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 integrati ng t he drive wi thin their system s t o perform t hose tests re quired a nd desig n their system to ensure that equipmen t operating in the same system as the drive or external to the sy stem 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 d irectives/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 platf or m s. The system confi gurati ons 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 complie s to the directives/standard(s), we cannot guarantee
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compli ance and provide CE Marking and C-Tick Marking for their product.

Electromagneti c com pli ance for the Europe an Uni on

If this model has the CE Marking it complies with the European Union requirements of the Electrom agnetic Compatibility Di rective 89/3 36/ EEC o f 03 May 1989 as am ende d by Directive 92/3 1/EE C of 28 April 1 992 a nd Directive 93/68/E E C of 22 Jul y 199 3.
4 Barracuda 4LP FC Product Man ual , Rev. A

Australian C-Tick

If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995 and meets the Electrom agnetic Compatibilit y (EMC) Framewor k requirement s of Australia’s Spectrum Man­agement Agency (SMA).

2.3 Reference documents

Barracuda 4LP F C Installat ion Gui d e
Seagate part number: 77767495
Fibre Channel Interface Manual
Seagate part number: 77767496
SCSI Interface Product Manual
Seagate part number: 77738479
ANSI Fibre Channel Documents
X3.230-1995 FC Physical and Signaling Interface (FC-P H) X3.272-1994 FC Arbitrat ed Loop (FC-AL ) X3T10-993.D Fibre Channel Protocol for SCSI (FCP) TR X3.XXX-199X Private Loop SCSI Direct Attach
ANSI Small Computer Syst em Interf ace (SCS I ) Document s
X3.131-1994 (SCSI-2)
X3.270-199X (SCSI-3) Architecture Model SFF-8045 Specificat ion for 40-pin SCA-2 Conne ctor with Parallel Sel ecti on, Re v. 3.7. In case of conflict between this document and any referenced document, this document takes precedence.
Barracuda 4LP FC Product Manual, Rev. A 5

3.0 General description

Barracuda 4LP FC drives are random access storage devices designed to support the Fibre Channel Arbi­trated Loop (FC-AL) and SCS I Fibre Channe l Protocol as described in the AN SI specifi ca tions, th is documen t, and the acteristics of this drive.
You can view the Fibre Channel interface simply as a transport vehicle for the supported command set (ST32171FC, S T34371FC, and ST34571FC d rives use the SCSI comm and set). In fact, the Fibre Channel interface is unaware of the content or meaning of the inform ation b eing transported. It simply packs the SCSI commands in frames, transports them to the appropriat e devices, and provides error checking to ensure that the information reaches its destinat ion accurately. Refer to the documents referen ced in Section 2.3 if you require additional info rmation a bout the Fibre Channel interface, F C-AL topology, or the SCSI fibre channel protocol.
The head and disc assembly (HDA) is environ mentally sealed at the factory. Air recirculates within the HDA through a non-replaceable filter to maint ain a conta min ation-free HDA environm ent.
Refer to Figure 2 for an exploded view of the drive. Never disassemble the HDA. This exploded view is for information only. Do not attempt to service item s in th e seal ed enclosure (heads, media, act uator, etc.) as this requires special facilities. The drive contains no parts repla ceable by the user and opening the HDA for any reason voids your warranty.
Fibre Channel Interfa ce Manual
(part number 77767496) which describes the general interface char-

Figure 2. Barracuda 4LP FC disc drive

Barracuda 4LP FC
possibility of destroying or degrading data by landing in the data zone. The heads automatically go to the land­ing zone when power is removed from the drive.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur­ing shipping and handling. The shipping lock disengages and the head load process begins when power is applied to the drive.
The drives also use a high-performance actuator assembly design that provides excellent performance with minimum power dissipation.
drives use a dedicated landing zone at the innermost radius of the media to eliminate the
6 Barracuda 4LP FC Product Man ual , Rev. A

3.1 Standard features

Barracuda 4LP FC drives have the following standard feat ures:
• Integrated dual port FC-AL controll e r
• Support for FC-AL (Fibre Channel Arbitrated Loop)
• Differential copper FC drivers and receivers
• Downloadable firmware using the FC-AL interface
• Drive selection ID and configurati on options are set on the FC-A L backpanel, T-card, or through interface
commands. Jumpers are not require d on the drive.
• Fibre Channel worldwide name uniquely identifies the drive and each port
• User-selectable logical block size (180 to 4,096 bytes)
• User-selectable number of sp are sectors per cylinder
• Industry standard 3.5-inch low profile (1 inch high) form factor dimensi on s
• Programmable logical blo ck reallocatio n scheme
• Flawed sector reallocation at format time
• Programmable autowri te and read reallo cation
• 128-bit Reed-Solomon error correction code
• Sealed head and disc assembly (HDA)
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Automatic shipping lock
• Embedded Grey Code track address to eliminate seek errors
• Self-diagnostics perform ed at power on
• 1:1 interleave
• Zone bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 1,024 Kbyte data buffer (see Section 4.5)

3.2 Media description

The media used on the drive has a diameter of approximately 8 6 mm (approximately 3.5 inches). The alum i­num substrate is coated wit h a thin film magnetic material, overcoated with a proprietary prote ctive layer for improved durability and environment al prot ectio n.

3.3 Performa nce

• Programmable multi-segmentable cache buffer
• 100 Mbytes/sec maxim um inst antaneous data transfer s
• 7,200 RPM spindle; average latency = 4.17 msec
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop com man d s
• Adaptive seek velocity; improved seek performance

3.4 Reliability

• 1,000,000 hour MTBF (Class A computer room environment)
• Fibre Channel (FC) interface transports SC SI protocol through CRC protected frames
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Seek To Improve Reli abil ity (STIR) algo ri thm
• Self-Monitorin g Analysis and Reporting Techno logy (S.M.A .R.T.)
Barracuda 4LP FC Product Manual, Rev. A 7

3.5 Unformatted and formatted cap aci ties

The standard OEM models are format ted to 512 bytes per block. The standard OEM model capacities are liste d below.
Formatted Unformatted
ST32171FC 2.16 Gbytes 2.65 Gbytes ST34371FC 4.35 Gbytes 5.31 Gbytes ST34571FC 4.55 Gbytes 5.54 Gbytes
Users having the necessary equipm ent m ay modify the dat a b lock size b efo re issuing a form at co mma nd a n d obtain different formatt ed capaciti es than t hose listed. User-available capacity also depe nds on the spare real­location scheme you select. See the Mode Select command and the Format comman d in the
Interface Manual
(part number 77767496).
Fibre Channel

3.6 Factory-installe d accessorie s

OEM standard drives are shipped with the
Barracud a 4LP FC Installat ion Gui d e
(part number 77767495).

3.7 Factory-instal led opti on s

You may order the following items which are incorporated at the manufacturing facili ty during production or packaged before shipping:
• Single-unit shipping pack. The drive is normally shipped in bulk packaging t o provide maximum protection against transit damage. Units shipped individually require additional protection as provided by the single unit shipping pack. Users planning single unit distribution should specif y this opt ion.
Barracuda 4LP F C Installat ion Gui d e
•
(part number 77767495).

3.8 User-installed accessories

The following accessorie s are available. All kits may be installed in the field.
• Single-unit shipping pack kit.
• Evaluation kit (part number 7578 3957). This kit provides an adapt er card (“T-card”) to allow cable c on nectio ns fo r two FC ports and DC pow er. Two twin axial cables, 6 feet in length, are included for the input and output connections to one FC interface port.
Barracuda 4LP FC Product Manual, Rev. A 9

4.0 Performance characteristics

This section provides detailed informa tion concerning perform ance-rela ted characteristi cs and features of Bar­racuda 4LP FC drives.

4.1 Internal drive characteristic s

ST32171FC ST34371FC ST34571FCST
Drive capacity 2.65 ..................5.31 ..................5.54 ................. Gbytes (unformatted)
2.15 . . ....... ..... ....4.35..................4.55 .................Gbytes (formatted with 512-byte sectors)
Read/write data heads 5 .......................10 .....................10
Bytes per track 102,500 ............102,500 ............106,980 ........... B ytes (average, unformatted)
Bytes per surface 531 ...................531 ...................554 .................. Mbytes (unformatt ed)
Cylinders/tracks per surface 5,178................5,178 ................5,178 ............... Tracks (user accessible)
Tracks per inch 5,555 ................5,555 ................5,555 ............... TPI
Internal data rate 80-122..............80-122 ..............83-126 ....... ...... Mbits/sec (variable with zone)
Disc rotation speed 7,200................7,200 ................7,200 ............... rpm
Avg rotational latency 4.17 ..................4.17 ..................4.17 ................. msec

4.2 Seek performanc e characte ristic s

Refer to paragraph 9.5, “FC-AL physical interface” and to the
Fibre Channel Interface Manual
(part number
77767496) for additional timing det ail s.

4.2.1 Access time

Including drive controller o ver h ead (msec) Drive level
Read Write
Average Typical
Single track Typical
Full stroke Typical
3
Maximum
3
Maximum
3
Maximum
4
10.8 11.3
2.0 2.1
9.4 10.4
4
2.2 2.3
17.5 18.5
4
20.0 20.5
1. Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a
Status Byte Transfer to the Initiator.
2. Assumes no errors and no sector has been relocated.
3. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientatio n as
measured on a representative sample of drives.
4. Maximum times are specified o ver the worst case conditions of temperature, voltage margins, and drive orientatio n.
When comparing specified access times, care should be taken to distinguish between typical access times and maxi­mum acces s ti mes . The best comparison is obtained by s ystem be nchmark tes ts cond ucted under identical conditions. Maximum times do not include error recovery.
1, 2
4.2.2 Format comman d executio n time for ≥ 512-byte sectors
ST32171FC ST34371FC ST34571FC
Maximum (with verify) 45 minutes 90 minutes 90 minutes Maximum (without verify) 30 minutes 60 minutes 60 minutes
10 Barracuda 4LP FC Pr oduct Ma n ual, Rev. A

4.2.3 General performance characteristics

ST32171FC ST34371FC ST34571FC
Minimum sector interleave 1 to 1
Data buffer to/from disc media (one 512-byte logical block)*
Minimum 9.5 MBytes/sec Average 13.2 MBytes/sec Maximum 15.0 MBytes/sec
Data buffer transfer rate to/from disc media (<1 track)*
Minimum 7.1 MBytes/sec Average 10.2 MBytes/sec Maximum 11.7 MBytes/sec
Fibre Channel Interface maximum instantaneous transfer rate 100 Mbytes/sec*
Logical block sizes
Default is 512-byte data blocks Variable (180 to 992 bytes) in multiples of 4 bytes Variable (992 to 4,096 bytes) in multiples of 32 bytes
Read/write consecutive sectors on a track Overhead time for head switch in sequential mode Overhead time for one track cylinder switch in sequential mode Average rotational latency
*Assumes no errors and no relocated logical blocks.
Yes 1 msec <2.4 msec (typical)
4.17 msec

4.3 Start/stop time

If the Motor Start option is disabled, the drive become s ready within 20 seconds aft er DC power is applied. If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and the time to become ready may exceed 20 seconds. During the start sequence, the drive responds to some commands over the FC-AL interface. Stop time is less than 20 seconds (maximum) from removal of DC power.
If the Motor Start op tion is enabled, the i nternal controller accept s the commands l isted in the
Interface Manual
less than 3 seconds after DC power has bee n applied. After the Moto r Start command has
Fibre Channel
been received, the drive becomes ready for normal operations within 30 seconds (excluding the error recovery procedure). The Motor Start command can also be used to command the drive to stop the spindle.
There is no power control switch on the drive.

4.4 Prefetch/multi-se gmen ted cach e contro l

The drive provides a prefetch /multi-segment ed cache algorit hm that in many cases can enhance syst em per­formance. To select thi s feature the host sends the Mode Select comm and with the proper values in the appli­cable bytes in page 08h. Default is prefetch and read cache enabled.
If the Prefetch feat ure is ena bled, data in co ntiguous log ical bl o cks on the disc imme diat ely beyon d that wh ich was requested by a Read comman d are retrieved and stored in the buffer for immediate transfer from the buffer to the host on subsequent Read com mands that request those logical blocks (th is is true even if cache operation is disabled). To enable Prefetch, use Mode Sel ect page 08h, byte 12 , bit 5 (Disable Read Ahea d ­DRA bit). DRA bit = 0 enables prefetch.
Barracuda 4LP FC Product Manual, Rev. A 11
Since data that is prefetched replaces data already in some buffe r segments, the host can limit the amount of prefetch data to optimize system performan ce. The Max Prefetch fiel d (bytes 8 and 9) limits the amount of prefetch. The drive does not use the Prefetch Ceili ng fiel d (bytes 10 and 11).

4.5 Cache operation Note. Refer to the

Of the 1,024 Kbytes physical buffer space in the d rive, 967.5 Kbytes can be used as a cache. The cache can be divided into logical segments from which data is read and to which dat a is written.
The drive keeps track of the logical block addresses of the data stored in each segment of the cache. If the cache is enabled (see RCD bit in the command is retrieved from the cache, if possible, before any disc access is initiated. Data in contiguous logical blocks immediately beyo nd that requested by the Read co mma nd ca n be retrieved and stored in the cache fo r immediate tra nsfer to the initiator on subsequent read commands. This is referred to as the prefetch operation. Since data that is pref etched m ay repl a ce data alre ady in the cache segm ent , an init iator can limit the am ount of prefetch data to optimize system performance. The drive never prefetches more sectors than the num ber specified in bytes 8 and 9 of Mode page 08h. If the cache is not enabled, 967.5 Kbyte s of the buffer are used as a circular buffer for read/writes, with no prefetch operation and no se gme nted cache operation.
The following is a simplified description of the prefetch/cache operat ion: Case A—read command is received and the first logical bloc k is already in cache:
1. Drive transfers to the initiator the first logical blo c k requested plus all subse quent cont iguou s logical blocks
that are already in the cache. This data may be in multiple segments.
2. When a requested logical block is reached that is not in a ny segme nt, the drive f etches it and any remain-
ing requested logical block addresses from the disc and pu ts them in a segment of the cache. The drive transfers the remaining requested logical blocks from the cache to the initiator in accordance with the “buffer-full” ratio specification given in Mode Select Disconn ect/Reconnect parame ters, page 02h.
3. The drive prefetches additional lo gical blocks contiguo us to those transferred in step 2 above and stores
them in the segment. The drive stops filling the segment when the maximum prefe tch value has been transferred.
Fibre Channel Interface Man ual
Fibre Channel I nte rface Manual
for more detail concerning the cache bits.
), data requested by the host with a read
Case B—read command i s recei ved and the f irst logical block addre ss requested is not in any segment of the cache.
1. The drive fetches the req uested logica l blocks from the disc and t ransfers them into a segment, and then
from there to the initiator in accordance with the “buffer-ful l” ratio specification given in Mode Select Dis­connect/Reconnect paramet ers, page 02h.
2. The drive prefetches additional logical blocks contigu ous to tho se transferred in Case A, step 2 above and
stores them in the segment. The drive st ops filling the segment when the maximum prefetch value ha s been transferred.
During a prefetch, the drive crosses a cyli nder bo undary to fe tch data only if the D i scontinu ity (DI S C) bit is set to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4.
Each cache segment is actually a self-contai ned circular buffer whose length is an integer number of logical blocks. The wrap-around capability of the individual segmen ts greatly enhances the cache’s overall perfor­mance, allowing a wide range of user-selectable configurations. The drive supports operation of any integer number of segment s from 1 to 16. Divide the 967 .5 Kb ytes i n the b uffer b y the number of segme nts to get the segment size. Default is 3 segments.

4.5.1 Caching write data

Write caching is a write operat ion b y the drive that ma kes use of a dri ve buffer storage area wh ere the dat a to be written to the medium is stored while the drive performs th e Write comm and.
Write caching is enabled indepe ndently of read caching. Write caching is d isabled by default on ST3217 1FC, ST34371FC, and ST34571FC drives. To enable the write cache, use the Write Caching Enable (WCE) bit.
For write caching, the same buffer space and segm ent ation is used as set up for read fun ctions. Whe n a write command is issued, the cache i s first checked to see if any logical blocks that are to be written are al ready
12 Barracuda 4LP FC Pr oduct Ma n ual, Rev. A
stored in the cache from a previous read or writ e command. If there are, the respective cache segment s are cleared. The new data is cached for subsequent read commands.
If a 10-byte CDB Write command (2Ah) is issued wit h the data page out (DPO) bit set to 1, no write data is cached, but the cache segments are still checked and cleared, if need be, for any logical blocks tha t are being written.
If the number of write data logical blocks exceeds the size of the segment being writ ten 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 wa s written there at the be ginning of the o peratio n. However, the drive does not overwrite data that has not yet been written to the medium.
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