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Printed 3:46 PM Sunday 21 April 2019
Working Project
Draft T10/BSR INCITS 502
Revision 22
2019 Apr 19
Information technology -
SCSI Primary Commands - 5 (SPC-5)
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
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ANSI INCITS 502-201x
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ANSI (r)
INCITS 502-201x
American National Standards
for Information Systems -
SCSI Primary Commands - 5 (SPC-5)
Secretariat
InterNational Committee for Information Technology Standards
Approved mm dd yy
American National Standards Institute, Inc.
Abstract
This standard defines the device model for all SCSI devices. This standard defines the SCSI commands that
are basic to every device model and the SCSI commands that may apply to any device model.
American
National
Standard
Approval of an American National Standard requires verification by ANSI that the
requirements for due process, consensus, and other criteria for approval have been
met by the standards developer. Consensus is established when, in the judgment of
the ANSI Board of Standards Review, substantial agreement has been reached by
directly and materially affected interests. Substantial agreement means much more
than a simple majority, but not necessarily unanimity. Consensus requires that all
views and objections be considered and that effort be made toward their resolution.
The use of American National Standards is co
mpletely voluntary; their existence
does not in any respect preclude anyone, whether he or she has approved the
standards or not, from manufacturing, marketing, purchasing, or using products,
processes, or procedures not confirming to the standards.
The American National S
tandards Institute does not develop standards and will in no
circumstances give interpretation on any American National Standard in the name of
the American National Standards Institute. Requests for interpretations should be
addressed to the secretariat or sponsor whose name appears on the title page of this
standard.
CAUTION NOTICE: Th
is American National Standard may be revised or withdrawn
at any time. The procedures of the American National Standards Institute require that
action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers
of American National Standards may receive current information on all standards by
calling or writing the American National Standards Institute.
CAUTION: The developers of this standard have requested that ho
lders of patents that may be required
for the implementation of the standard, disclose such patents to the publisher. However, neither the
developers nor the publisher have undertaken a patent search in order to identify which, if any, patents
may apply to this standard.
As of the date of publication of this standard, following calls for the identification of patents that may be
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uired for the implementation of the standard, notice of one or more claims has been received.
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No further patent search is conducted by the developer or the publisher in respect to any standard it
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cesses. No representation is made or implied that licenses are not required to avoid infringement in
the use of this standard.
Published by
American National Standards Institute
25 West 43rd Street 4th floor
New York, New York 10036-7422
No part of this publication may be reproduc
ed in any form, in an electronic retrieval system or otherwise,
without prior written permission of ITI, 1101 K Street NW, Suite 610, Washington, DC 20005-7031.
All rights reserved.
Printed in the United States of America
2019 Apr 19 T10/BSR INCITS 502 Revision 22
Working Draft SCSI Primary Commands - 5 (SPC-5) v
Contents
Page
Foreword ..................................................................................................................................................... xxxiv
SCSI standards family................................................................................................................................xxxviii
1 Scope ............................................................................................................................................................. 1
2 Normative references..................................................................................................................................... 1
3 Definitions, symbols, abbreviations, and conventions.................................................................................... 5
3.1 Definitions ............................................................................................................................................. 5
3.2 Abbreviations and symbols................................................................................................................. 17
3.2.1 Abbreviations ................................................................................................................................... 17
3.2.2 Symbols ........................................................................................................................................... 19
3.2.3 Mathematical operators ................................................................................................................... 20
3.3 Keywords ............................................................................................................................................ 20
3.4 Conventions........................................................................................................................................ 21
3.5 Numeric and character conventions ................................................................................................... 22
3.5.1 Numeric conventions ....................................................................................................................... 22
3.5.2 Units of measure.............................................................................................................................. 23
3.5.3 Byte encoded character strings conventions ................................................................................... 23
3.6 Bit and byte ordering........................................................................................................................... 24
3.7 Notation conventions .......................................................................................................................... 25
3.7.1 Notation for procedure calls............................................................................................................. 25
3.7.2 Notation for state diagrams.............................................................................................................. 26
3.7.3 Notation for flowcharts ..................................................................................................................... 27
3.7.4 Notation for EXTENDED COPY command segment descriptors .................................................... 28
4 General concepts ......................................................................................................................................... 29
4.1 Introduction ......................................................................................................................................... 29
4.2 Command Descriptor Block ................................................................................................................ 29
4.2.1 CDB usage and structure ................................................................................................................ 29
4.2.2 Fixed length CDB formats................................................................................................................ 30
4.2.2.1 Formats for 6-byte CDBs .............................................................................................................. 30
4.2.2.1.1 Generic 6-byte CDB format ....................................................................................................... 30
4.2.2.1.2 Typical 6-byte CDB format......................................................................................................... 30
4.2.2.2 Formats for 10-byte CDBs ............................................................................................................ 31
4.2.2.2.1 Generic 10-byte CDB format ..................................................................................................... 31
4.2.2.2.2 Typical 10-byte CDB format....................................................................................................... 32
4.2.2.3 Formats for 12-byte CDBs ............................................................................................................ 33
4.2.2.3.1 Generic 12-byte CDB format ..................................................................................................... 33
4.2.2.3.2 Typical 12-byte CDB format....................................................................................................... 34
4.2.2.3.3 MAINTENANCE IN CDB format ................................................................................................ 35
4.2.2.3.4 MAINTENANCE OUT CDB format ............................................................................................35
4.2.2.3.5 SERVICE ACTION IN(12) CDB format......................................................................................36
4.2.2.3.6 SERVICE ACTION OUT(12) CDB format.................................................................................. 36
4.2.2.4 Formats for 16-byte CDBs ............................................................................................................ 37
4.2.2.4.1 Generic 16-byte CDB format ..................................................................................................... 37
4.2.2.4.2 Typical 16-byte CDB format, if eight-byte LBAs not supported ................................................. 38
4.2.2.4.3 Typical 16-byte CDB format with eight-byte LBAs supported.................................................... 39
4.2.2.4.4 SERVICE ACTION IN(16) CDB format......................................................................................40
4.2.2.4.5 SERVICE ACTION OUT(16) CDB format.................................................................................. 40
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