ISO/IEC 17760-302:2025

International
Standard
ISO/IEC 17760-302
First edition
Information technology — AT
2025-10
Attachment —
Part 302:
Zoned Device ATA Command Set-
2-(ZAC-2)
Technologies de l’information — Attachement AT —
Partie 302: Jeu de commande 2-(ZAC-2) ATA de dispositif de zones
Reference number
© ISO/IEC 2025
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© ISO/IEC 2025 – All rights reserved
ii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members
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In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by INCITS (as INCITS 549-2022) and drafted in accordance with its editorial
rules. It was adopted, under the JTC 1 PAS procedure, by Joint Technical Committee ISO/IEC JTC 1, Information
technology.
A list of all parts in the ISO/IEC 17760 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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committees.
© ISO/IEC 2025 – All rights reserved
iii
Contents
Page
Contents.iv
Tables .xiii
Figures . xv
1 Scope. 1
2 Normative references. 2
3 Definitions, abbreviations, and conventions. 3
3.1 Definitions. 3
3.2 Symbols and abbreviations. 8
3.2.1 Abbreviations . 8
3.2.2 Units . 9
3.2.3 Symbols . 9
3.2.4 Mathematical operators. 9
3.3 Keywords. 9
3.4 Conventions. 10
3.4.1 Overview . 10
3.4.2 Precedence . 11
3.4.3 Lists. 11
3.4.3.1 Lists overview . 11
3.4.3.2 Unordered lists. 11
3.4.3.3 Ordered lists . 11
3.4.4 Numbering. 12
3.4.5 Bit conventions. 12
3.4.6 Number range convention. 12
3.4.7 State diagram convention . 13
3.4.8 Offset convention . 13
4 Features. 14
4.1 Feature set introduction. 14
4.2 Basic zoned device model. 15
4.3 Host Aware Zones feature set . 16
4.4 Host Managed Zones feature set . 17
4.5 Zone Domains feature set . 18
4.5.1 Overview . 18
4.5.2 Zone Domains. 19
4.5.3 Zone domain 0 . 20
4.5.4 Zone domains other than zone domain 0. 20
4.5.5 Zone activation in the Zone Domains feature set. 21
4.6 Zone Realms feature set . 22
4.6.1 Overview . 22
4.6.2 Realm boundary considerations. 24
4.6.3 Zone activation in the Zone Realms feature set. 25
4.6.4 Realm attributes . 25
4.6.4.1 Introduction. 25
4.6.4.2 Restrict Write Pointer Reset . 25
4.6.4.3 Restrict Zone Activate. 26
4.7 Zone attributes. 27
4.7.1 Summary. 27
4.7.2 Zone Type zone attribute . 27
4.7.3 Zone Condition zone attribute . 29
iv
© ISO/IEC 2025 – All rights reserved

4.7.4 WPointer zone attribute. 29
4.7.5 RWP Recommended zone attribute. 29
4.7.6 Non-Sequential Write Resources Active zone attribute . 30
4.7.7 Predicted Unrecovered Errors Present zone attribute . 30
4.8 Zone types. 31
4.8.1 Overview . 31
4.8.2 Conventional zones. 31
4.8.2.1 Overview. 31
4.8.2.2 Access Pattern Requirements . 31
4.8.2.3 Conventional Zone state machine . 32
4.8.2.3.1 Overview . 32
4.8.2.3.2 CMR1: Not Write Pointer state. 33
4.8.2.3.3 CMR2: Read Only state . 33
4.8.2.3.4 CMR3: Offline state. 34
4.8.3 Write pointer zones . 34
4.8.3.1 Features common to all write pointer zones . 34
4.8.3.1.1 General . 34
4.8.3.1.2 Resetting the write pointer . 35
4.8.3.1.3 Open zone resources. 36
4.8.3.1.4 Errors common to access pattern requirements for all write pointer zones . 36
4.8.3.2 Sequential Write Preferred zones. 37
4.8.3.2.1 Overview . 37
4.8.3.2.2 Access Pattern Requirements. 37
4.8.3.2.2.1 Writing in Sequential Write Preferred zones. 37
4.8.3.2.2.2 Reading in Sequential Write Preferred zones. 39
4.8.3.2.2.3 Substitute data pattern for Sequential Write Preferred zones . 39
4.8.3.3 Sequential Write Required zones . 39
4.8.3.3.1 Overview . 39
4.8.3.3.2 Access Pattern Requirements. 39
4.8.3.3.2.1 Writing in Sequential Write Required zones .
...