Seagate ST11200 User manual

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Disc Drive SCSI-2/SCSI-3 Interface
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Family Models:
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ST11200, ST12400, ST12400 Wide,
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ST3600, ST3610,
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ST31200, ST31200 Wide,
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ST32430, ST32430 Wide, ST15230,
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ST3655, ST11950, ST11950Wide,
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ST12450 Wide, ST12550,
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ST12550 Wide, ST15150,
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ST15150 Wide, ST31250
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ST31250 Wide, ST32550
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ST32151, ST31051
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ST32550 Wide, ST410800
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ST34371
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Product Manual, Volume 2; Version 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disc Drive SCSI-2/SCSI-3 Interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Family Models:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST11200, ST12400, ST12400 Wide,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST3600, ST3610,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST31200, ST31200 Wide,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32430, ST32430 Wide, ST15230,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST3655, ST11950, ST11950Wide,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST12450 Wide, ST12550,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST12550 Wide, ST15150,
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST15150 Wide, ST31250
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST31250 Wide, ST32550
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32151, ST31051
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST32550 Wide, ST410800
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST34371
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual, Volume 2; Version 2
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1995 SeagateTechnology, Inc.All rights reserved
Publication Number: 77738479, Rev E
January 1995
Seagate, SeagateTechnologyand the Seagate logo are registered trademarks of SeagateTechnology,
Inc.HAWKTM, SeaFAX,SeaFone, SeaTDDandSeaBOARDare trademarks of SeagateTechnology,
Inc. Other product names are registered trademarks or trademarks of their 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 SeagateTechnology, Inc.

Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2;Ver. 2), Rev. E v
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Revision Status Summary Sheet
Revision Authority Date Signature Sheets Affected
A Issue 12/18/92 D. Ashby/J. Averyt 1/1, 1 thru 257.
B PLD:83345 8/18/93 1/1, 1 thru 4, 4.1, 5 thru 193
deleted shs 194 thru 257.
Technical changes on pages
5, 9, 10, 78, 93, 94, 104 - 107,
109, 136, 139 - 142, 144, 147,
149, 161 - 164, 166, 167, 181,
185 thru 193.
C PLD: 83534 93 Oct. 19 SS 1/1, Revised sheets v thru ix, 1 thru
193.(Technical changes on pages
v, vii, 1, 4, 5, 7, 8, 47, 70, 73, 78, 79,
83, 84, 86, 87, 90, 91, 93, 94, 104,
105,107, 112, 114, 119,123-131,
136-144, 147-156, 158-160, 162-
170, 176, 178-180, 184, 185, 189
192 and 193).
D PLD:85300 5/26/94 SS 1/1, v thru ix, 1 thru 189; (technical changes
on pages 1, 8, 12, 26, 29, 34, 35, 70, 71, 77,
79, 80, 84, 85, 86, 95, 101, 104, 125, 150,
125, 150, 151, 160, 162, 163 & 164.)
E PLD:87127 01/24/95 1/1, v thru ix, 1 thru 187; deleted shs188 and 189.
Renumbered pages 94 thru 187. (Technical
changes on pages vi, vii, ix, 1, 2, 18, 21, 25, 26,
32, 33, 47, 50, 57, 68, 72, 74, 75, 77, 78, 79, 87,
88 - 90, 94, 105, 110, 114, 122, 124, 126, 127,
133, 135, 136, 139, 140, 143, 150, 152, 154,
158, 160, 162 - 164, 168 - 175, 178, 187.

vi Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2;Ver. 2), Rev. E
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Table of contents
1.0 Interface requirements ............................................................................................................ 1
1.1 How to use this interface manual .................................................................................. 1
1.2 General interface description ........................................................................................ 1
1.3 Physical interface characteristics.................................................................................. 3
1.4 Summary of SCSI commands and messages............................................................... 4
2.0 SCSI bus................................................................................................................................... 6
2.1 SCSI bus signals .......................................................................................................... 7
2.1.1 Drive select ...................................................................................................... 8
2.1.2 Signal values.................................................................................................... 8
2.1.3 OR-Tiedsignals ............................................................................................... 8
2.1.4 Signal sources ................................................................................................. 8
2.2 SCSI bus timing ............................................................................................................ 9
2.2.1 Arbitration delay ............................................................................................... 9
2.2.2 Assertion period ............................................................................................... 9
2.2.3 Bus Clear delay................................................................................................10
2.2.4 Bus Free delay.................................................................................................10
2.2.5 Bus Set delay...................................................................................................10
2.2.6 Bus Settle delay ...............................................................................................10
2.2.7 Cable Skew delay ............................................................................................ 10
2.2.8 Data Release delay..........................................................................................10
2.2.9 Deskew delay ..................................................................................................10
2.2.10 Disconnection delay......................................................................................... 10
2.2.11 Hold time..........................................................................................................10
2.2.12 Negation period................................................................................................ 10
2.2.13 Reset Hold time ...............................................................................................11
2.2.14 SelectionAbort time .........................................................................................11
2.2.15 SelectionTimeout delay ...................................................................................11
2.2.16 Transfer Period(negotiated by SDTR message)...............................................11
2.3 Fast synchronous transfer option timing .......................................................................11
2.3.1 Fast Assertion period ....................................................................................... 11
2.3.2 Fast Cable Skew delay ....................................................................................11
2.3.3 Fast Deskew delay...........................................................................................11
2.3.4 Fast Hold time..................................................................................................11
2.3.5 Fast Negation period........................................................................................11
3.0 Logical characteristics ............................................................................................................ 12
3.1 SCSI bus phases ..........................................................................................................12
3.1.1 Bus Free phase................................................................................................12
3.1.2 Arbitration phase ..............................................................................................13
3.1.3 Selection phase ...............................................................................................13
3.1.4 Reselection phase ........................................................................................... 15
3.1.5 Information Transfer phases ............................................................................ 16
3.1.6 Command phase.............................................................................................. 18
3.1.7 Data phase ......................................................................................................18
3.1.8 Status phase (see Section 4.3) ........................................................................18
3.1.9 Message phase................................................................................................19
3.1.10 Signal Restrictions Between phases...... ..........................................................19

Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2;Ver. 2), Rev. E vii
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Table of contents
3.2 SCSI bus conditions......................................................................................................20
3.2.1 Attention conditions (see Unit Attention Condition, 4.6).................................... 20
3.2.2 Reset condition ................................................................................................21
3.2.3 ContingentAllegiance condition .......................................................................21
3.3 SCSI bus phase sequences.......................................................................................... 21
3.3.1 Nonarbitrating system ...................................................................................... 21
3.3.2 Arbitrating systems .......................................................................................... 21
3.3.3 All systems....................................................................................................... 22
3.4 SCSI pointers................................................................................................................ 23
3.4.1 Current pointers ...............................................................................................24
3.4.2 Saved pointers ................................................................................................. 24
3.5 Message system specification ...................................................................................... 24
3.5.1 General message protocol ...............................................................................25
3.5.2 Messages - general .........................................................................................25
3.5.3 Message details ...............................................................................................27
3.5.3.1 One and Two Byte message ............................................................ 27
3.5.3.2 Extended message .......................................................(01h) ......... 35
4.0 SCSI commands ...................................................................................................................... 42
4.1 Commandimplementationrequirements ...................................................................... 42
4.1.1 Reserved .........................................................................................................42
4.2 Command descriptor block (CDB) ................................................................................42
4.2.1 Operation code ................................................................................................ 43
4.2.2 Logical Unit Number (LUN) ..............................................................................44
4.2.3 Logical Block Address......................................................................................45
4.2.4 Relative Address Bit.........................................................................................45
4.2.5 Transfer Length................................................................................................45
4.2.6 Control Byte ..................................................................................................... 46
4.3 Status ...........................................................................................................................46
4.4 Command examples ..................................................................................................... 48
4.4.1 Single Command example ............................................................................... 48
4.4.2 Disconnect example......................................................................................... 50
4.5 Timing examples........................................................................................................... 52
4.6 Unit attention condition..................................................................................................67
4.7 Queued I/O processes..................................................................................................68
4.7.1 Untaggedqueuing............................................................................................68
4.7.2 Tagged queuing ...............................................................................................68
4.8 ParameterRounding.....................................................................................................70
4.9 Command Processing considerations and exception conditions...................................70
4.9.1 ProgrammableOperatingdefinition.................................................................. 70
4.9.2 Incorrect initiator connection ............................................................................71
4.9.3 Selection of an Invalid Logical unit ................................................................... 71
5.0 Command descriptions...........................................................................................................72
5.1 Command descriptions for all device types...................................................................72
5.1.1 Group 0 commands for all device types ...........................................................72
5.1.1.1 Test Unit Ready.............................................................(0h) ........... 72
5.1.1.2 Request Sense command.............................................(03h) ......... 73
5.1.1.2.1 Deferred errors.................................................................81
5.1.1.3 Inquiry command ..........................................................(12h) ......... 82
5.1.1.3.1 Vital product data pages...................................................86
5.1.1.4 Copy command.............................................................(18h) .........95
5.1.1.5 Receive Diagnostic results command ...........................(1Ch)......... 95
5.1.1.6 Send Diagnostic command ...........................................(1Dh) .........100

viii Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2;Ver. 2), Rev. E
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Table of contents
5.1.2 Group 1 commands for all device types ......................................................... 103
5.1.2.1 Compare command ......................................................(39h) ....... 103
5.1.2.2 Copy and verify command ............................................(3Ah) ....... 103
5.1.2.3 Write Data Buffer command..........................................(3Bh) ....... 103
5.1.2.3.1 Combined Header and Data Mode................(000b) ..... 104
5.1.2.3.2 Write Data Only ............................................................. 105
5.1.2.3.3 Download & Save Microcode Mode ..............(101b) ..... 105
5.1.2.4 Read Data Buffer command..........................................(3Ch)....... 106
5.1.2.4.1 Read Combined Descriptor Header
and Data Mode .............................................(000b) ..... 106
5.1.2.4.2 Read data ...................................................................... 107
5.1.2.4.3 Descriptor mode ...........................................(011b)...... 107
5.1.3 Group 2 Commands for All DeviceTypes....................................................... 108
5.1.3.1 Change Definition command.........................................(40h) ....... 108
5.1.3.2 Log Select command ....................................................(4Ch)....... 109
5.1.3.2.1 Write, Read andVerify Error Counter pages
(code 02, 03, 05h) ......... 116
5.1.3.2.2 Non-Medium Error page ...............................(code 06h) 118
5.1.3.2.3 Cache Statistics page ...................................(code 37h) 118
5.1.3.3 Log Sense command ....................................................(4Dh)....... 119
5.1.3.4 Other Group 2 commands ............................................................. 121
5.1.4 Groups 3 through 5 commands for all device types ....................................... 121
5.1.5 Group 6 commands for all device types ......................................................... 121
5.1.6 Group 7 commands for all device types ......................................................... 121
5.2 Command descriptions for direct access devices ....................................................... 121
5.2.1 Group 0 commands for direct access devices ............................................... 121
5.2.1.1 Rezero Unit command ..................................................(01h) ....... 122
5.2.1.2 Format Unit command ..................................................(04h) ....... 122
5.2.1.3 Reassign Blocks command...........................................(07h). ...... 130
5.2.1.4 Read command ............................................................(08h) ....... 132
5.2.1.5 Write command.............................................................(0Ah) ....... 134
5.2.1.6 Seek command.............................................................(0Bh) ....... 135
5.2.1.7 Mode Select (6) command ............................................(15h) ....... 136
5.2.1.8 Reserve command........................................................(16h) ....... 140
5.2.1.9 Release command ........................................................(17h). ...... 142
5.2.1.10 Mode Sense (6) command............................................(1Ah) ....... 143
5.2.1.11 Start Stop Unit command ..............................................(1Bh) ....... 169
5.2.1.12 Prevent/Allow Medium Removal command...................(1Eh). ...... 170
5.2.2 Group 1 command for direct access devices ................................................. 170
5.2.2.1 Read Capacity command..............................................(25h) ....... 170
5.2.2.2 Read Extended command.............................................(28h) ....... 172
5.2.2.3 Write Extended command .............................................(2Ah) ....... 174
5.2.2.4 Seek Extended command .............................................(2Bh) ....... 175
5.2.2.5 Write andVerify command ............................................(2Eh) ....... 176
5.2.2.6 Verify command ............................................................(2Fh) ....... 177
5.2.2.7 Synchronize Cache command ......................................(35h) ....... 178
5.2.2.8 Read Defect Data command.........................................(37h) ....... 179

Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2;Ver. 2), Rev. E ix
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Table of contents
5.2.2.9 Read Long command....................................................(3Eh) ....... 181
5.2.2.10 Write Long command ....................................................(3Fh) ....... 183
5.2.2.11 Reserve (10) command ................................................(56h) ....... 184
5.2.2.12 Release (10) command.................................................(57h) ....... 185
5.2.2.13 Mode Select (10) command ..........................................(55h) ....... 186
5.2.2.14 Mode Sense (10) command..........................................(5Ah) ....... 186
6.0 SeagateTechnical Support Service ..................................................................................... 187