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首页SCSI Block Commands – 4 (SBC-4)
SCSI Block Commands – 4 (SBC-4) This standard defines the command set extensions to facilitate operation of SCSI direct access block devices. The clauses in this standard, implemented in conjunction with the applicable clauses of SPC-5, specify the standard command set for SCSI direct access block devices.
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Working Draft Project
American National T10/BSR INCITS 506
Standard
Revision 12a
19 October 2016
Information technology -
SCSI Block Commands – 4 (SBC-4)
This is an internal working document of T10, a Technical Committee of Accredited Standards Committee
INCITS (International Committee for Information Technology Standards). As such this is not a completed
standard and has not been approved. The contents may be modified by the T10 Technical Committee. The
contents are actively being modified by T10. This document is made available for review and comment only.
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Reference number

T10/BSR INCITS 506 Revision 12a 19 October 2016
ii Working Draft SCSI Block Commands – 4 (SBC-4)
ISO/IEC 14776-324:201x
BSR INCITS 506:201x
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19 October 2016 T10/BSR INCITS 506 Revision 12a
Working Draft SCSI Block Commands – 4 (SBC-4) iii
American National Standard
for Information Technology
SCSI Block Commands – 4 (SBC-4)
Secretariat
Information Technology Industry Council
Approved mm.dd.yy
American National Standards Institute, Inc.
Abstract
This standard specifies the functional requirements for the SCSI Block Commands - 4 (SBC-4) command set.
SBC-4 permits SCSI block logical units such as rigid disks to attach to computers and provides the definition
for their use.
This standard maintains a high degree of compatibility with the SCSI Block Commands (SBC-3) command
set, INCITS 514-2014, and while providing additional functions, is not intended to require changes to
presently installed devices or existing software.

T10/BSR INCITS 506 Revision 12a 19 October 2016
iv Working Draft SCSI Block Commands – 4 (SBC-4)
Published by
American National Standards Institute
11 W. 42nd Street, New York, New York 10036
Copyright © 2014 by Information Technology Industry Council (ITI).
All rights reserved.
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without prior written permission of ITI, 1101 K Street, NW Suite 610,
Washington, DC 20005.
Printed in the United States of America
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National
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19 October 2016 T10/BSR INCITS 506 Revision 12a
Working Draft SCSI Block Commands – 4 (SBC-4) v
Revision History
This revision history is not part of American National Standard INCITS 1799:200x.
R.1 Revision 0 (27 February 2014)
Revision 0 of SBC-4 is substantially equal to revision 36 of SBC-3. The only differences arise from changes
made in SBC-3 discovered during the ISO process and modification of the format of the definitions to use the
new ISO style of “Note to Entry” for definitions that are longer than a single sentence.
R.2 Revision 1 (14 March 2014)
Incorporated the following proposals:
a) Fixed “
LENGTH OF SENSE DATA” to “LENGTH OF THE SENSE DATA FIELD” in 5.22.2;
b) 14-003r1 - Add reporting of unrecoverable errors that aren't reassigned
c) 14-019r2 - Discussion of WCE intent
d) 14-061r0 - 'Not defined' is not defined sufficiently;
e) 14-018r3 - Update Block Device Characteristics VPD page for ZBC; and
f) 13-094r4 - Supported Block lengths and protection types VPD page.
R.3 Revision 2 (20 May 2014)
Incorporated the following proposals:
a) Corrected editorial errors on incorporation 14-003r1;
b) 14-112r0 - Clarifying token timeout;
c) 14-103r1 - Obsolete EER, DCR bits in Read-Write Recovery mode page;
d) 14-075r1 - Designed Utilization VPD data; and
e) 14-043r4 - Atomic writes and reads.
R.4 Revision 3 (27 August 2014)
Incorporated the following proposals:
a) Corrected errors on incorporation of 13-094r5;
b) 14-148r3 - Redefinition of Peripheral device type;
c) 14-143r0 - Enhancing SBC-4 to allow ZBC to share its VPD page definitions;
d) 14-163r1 - Make the WRITE SAME no Data-Out Buffer bit broadly useful; and
e) 14-178r1 - Disable PI checking on write if PI is all Fs.
R.5 Revision 4(4 December 2014)
Incorporated the following proposals:
a) Corrected errors on incorporation of 14-178r1;
b) 14-210r1 Minimal Workload Utilization logging
c) 14-064r5 Granular Boundaries for ATOMIC commands
d) 14-128r4 Unmap methods and text clarifications
e) 14-262r1 Thin Provisioning and De-Dupe interactions
f) 14-238r0 Remove Unused MMC Restrictions
g) 14-188r3 Resolve error cases with supporting Application Tag mode page
h) 14-107r8 Command Deadlines
i) 14-281r1 Zone Control command
j) 14-233r3 READ CAPACITY (16)
k) 14-194r2 Update Block Device Characteristics VPD page for Self Managed Devices
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