ISO/IEC 17760-302:2025

Information technology — AT Attachment — Part 302: Zoned Device ATA Command Set-2-(ZAC-2)

The set of AT Attachment standards consists of this document and the ATA implementation standards described in AT Attachment - 8 ATA/ATAPI Architecture Model (ATA8-AAM). This document specifies the command set that host systems use to access storage devices that implement the Host Aware Zones feature set (see 4.3), the Host Managed Zones feature set (see 4.4), the Zone Domains feature set (see 4.5), and the Zone Realms feature set (see 4.6). This document provides a common command set for systems manufacturers, system integrators, software suppliers, and suppliers of storage devices that provide one or more of the zones feature sets. Figure 1 shows the relationship of This document to other ATA standards as well as related device and host standards and specifications (e.g., SCSI standards and SATA-I0 specifications). This document maintains compatibility with the ACS-5 standard, INCITS 558-202x, while providing additional functions.

Technologies de l’information — Attachement AT — Partie 302: Jeu de commande 2-(ZAC-2) ATA de dispositif de zones

General Information

• Status: Published
• Publication Date: 28-Oct-2025
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1 - Information technology
• Drafting Committee: ISO/IEC JTC 1 - Information technology
• Current Stage: 6060 - International Standard published
• Start Date: 29-Oct-2025
• Due Date: 09-Oct-2025
• Completion Date: 29-Oct-2025

Standards Content (Sample)

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
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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.
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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
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© 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 . 39
4.8.3.3.2.2 Reading in Sequential Write Required zones. 40
4.8.3.3.2.3 Substitute data pattern for Sequential Write Required zones. 41
4.8.3.3.2.4 Opening Sequential Write Required zones. 41
4.8.3.4 Sequential Or Before Required zones. 41
4.8.3.4.1 Overview . 41
4.8.3.4.2 Access pattern requirements . 41
4.8.3.4.2.1 Writing in Sequential Or Before Required zones. 41
4.8.3.4.2.2 Reading in Sequential Or Before Required zones. 42
4.8.3.4.2.3 Substitute data pattern for Sequential Or Before Required zones. 42
4.8.3.5 Zone Condition state machine. 42
4.8.3.5.1 Overview . 42
4.8.3.5.2 ZC1: Empty state . 45
4.8.3.5.3 ZC2: Implicit_Open state. 46
4.8.3.5.4 ZC3: Explicit_Open state . 47
4.8.3.5.5 ZC4: Closed state . 48
4.8.3.5.6 ZC5: Full state. 49
4.8.3.5.7 ZC6: Read_Only state. 50
4.8.3.5.8 ZC7: Offline state . 51
4.8.3.5.9 ZC8: Inactive state . 51
4.8.3.5.10 Manage Open Zone Resources function . 51
4.8.3.5.10.1 Overview. 51
4.8.3.5.10.2 Processing a sequential write preferred zone. 52
4.8.3.5.10.3 Processing a sequential write required zone. 52
4.8.3.5.11 Explicitly Open Zone function. 53
4.8.3.5.12 Close Zone function . 53
4.8.3.5.13 Finish Zone function. 53
4.8.3.5.14 Reset Write Pointer function . 54
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© ISO/IEC 2025 – All rights reserved

4.8.3.5.15 Sequentialize function . 54
4.8.4 Gap zones. 54
4.9 Additional feature set interactions. 56
4.9.1 Introduction . 56
4.9.2 Capacity reporting . 56
4.9.3 Zoned device internal resource management. 56
4.9.4 Unexpected power removal . 56
4.9.5 Media failure. 57
4.9.6 Interactions with volatile caches. 57
4.9.7 Interactions with the Sanitize Device feature set . 58
4.9.8 Interactions with the Power Management feature set . 59
4.9.9 Interactions with the Security feature set . 59
4.9.9.1 Interactions with the SECURITY ERASE UNIT command . 59
4.9.9.2 Interactions with the SEC4: Security Enabled/Locked/Not Frozen state. 60
4.9.10 Interactions with the SCT Write Same command . 60
4.9.10.1 Overview. 60
4.9.10.2 WRITE AND SET SUBSTITUTE DATA PATTERN bit. 61
4.9.10.3 ZONE POST PROCESSING field . 61
4.9.11 Interactions with the WRITE UNCORRECTABLE EXT command. 61
4.9.12 Interactions with the SET SECTOR CONFIGURATION EXT command and MUTATE EXT
command . 62
4.9.13 Interactions with the Storage Element Depopulation feature set . 62
4.9.13.1 Depopulation operations and depopulation restoration operations . 62
4.9.13.2 Depopulation with zone modifications . 63
4.9.13.2.1 Depopulation with zone modifications overview. 63
4.9.13.2.2 Depopulation with zone modifications processing . 63
4.9.13.2.2.1 Processing overview. 63
4.9.13.2.2.2 Predicted unrecovered errors processing. 64
4.9.13.2.3 Allowed commands during depopulation with zone modifications processing. 64
4.9.13.2.4 Power-on reset handling . 64
4.9.13.2.5 Progress checking during depopulation with zone modifications. 65
4.9.13.2.6 Depopulation with zone modifications interactions with logs. 65
4.9.13.2.7 Depopulation with zone modifications interactions with caches. 65
5 Command descriptions . 66
5.1 Command description introduction . 66
5.2 Zone management commands. 69
5.2.1 Overview . 69
5.2.2 ZAC Management In command template, 4Ah, DMA . 70
5.2.2.1 Feature Set. 70
5.2.2.2 Description. 70
5.2.2.3 Inputs. 70
5.2.2.3.1 Overview . 70
5.2.2.3.2 Action specific fields. 70
5.2.2.3.3 ZM_ACTION field. 71
5.2.2.3.4 RETURN PAGE COUNT field . 71
5.2.2.4 Normal Outputs and Error Outputs. 71
5.2.2.5 NCQ encapsulation for a DMA ZAC Management In command . 71
5.2.3 ZAC Management Out command template, 9Fh, DMA . 72
5.2.3.1 Feature Set. 72
5.2.3.2 Description. 72
5.2.3.3 Inputs. 72
5.2.3.3.1 Overview . 72
5.2.3.3.2 PAGES TO SEND field. 72
5.2.3.4 Normal Outputs and Error Outputs. 72
5.2.3.5 NCQ encapsulation for a DMA ZAC Management Out command. 73
5.2.4 ZAC Management Out command template, 9Fh, Non-Data . 74
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© ISO/IEC 2025 – All rights reserved

5.2.4.1 Feature Set. 74
5.2.4.2 Description. 74
5.2.4.3 Inputs. 74
5.2.4.3.1 Overview . 74
5.2.4.3.2 ALL bit . 74
5.2.4.3.3 Zone range specification fields. 75
5.2.4.3.3.1 Overview. 75
5.2.4.3.3.2 ZONE COUNT field. 75
5.2.4.3.3.3 ZONE ID field . 75
5.2.4.3.3.4 Zone range specification errors . 75
5.2.4.4 Normal Outputs. 75
5.2.4.5 Error Outputs . 76
5.2.4.6 Non-Data NCQ encapsulation . 76
5.2.5 CLOSE ZONE EXT command – 9Fh/01h, Non-Data. 77
5.2.5.1 Feature Set. 77
5.2.5.2 Description. 77
5.2.5.3 Inputs. 77
5.2.5.3.1 Overview . 77
5.2.5.3.2 Zone range specification fields for the CLOSE ZONE EXT command. 77
5.2.5.3.3 CLOSE ZONE EXT command processing. 77
5.2.5.4 Normal Outputs. 78
5.2.5.5 Error Outputs . 78
5.2.6 FINISH ZONE EXT command – 9Fh/02h, Non-Data . 79
5.2.6.1 Feature Set. 79
5.2.6.2 Description. 79
5.2.6.3 Inputs. 79
5.2.6.3.1 Overview . 79
5.2.6.3.2 Zone range specification fields for the FINISH ZONE EXT command. 79
5.2.6.3.3 FINISH ZONE EXT command processing . 80
5.2.6.4 Normal Outputs. 80
5.2.6.5 Error Outputs . 80
5.2.7 OPEN ZONE EXT command – 9Fh/03h, Non-Data. 81
5.2.7.1 Feature Set. 81
5.2.7.2 Description. 81
5.2.7.3 Inputs. 81
5.2.7.3.1 Overview . 81
5.2.7.3.2 Zone range specification fields for the OPEN ZONE EXT comman.d. 81
5.2.7.3.3 OPEN ZONE EXT command processing. 82
5.2.7.4 Normal Outputs. 82
5.2.7.5 Error Outputs . 82
5.2.8 REPORT REALMS EXT command – 4Ah/06h, DMA . 83
5.2.8.1 Feature Set. 83
5.2.8.2 Description. 83
5.2.8.3 Inputs. 83
5.2.8.3.1 Overview . 83
5.2.8.3.2 REPORTING OPTIONS field. 83
5.2.8.3.3 REALM LOCATOR field. 84
5.2.8.4 Normal Outputs. 84
5.2.8.5 Error Outputs . 84
5.2.8.6 Input From the Device to the Host Data Structure. 84
5.2.8.6.1 Overview . 84
5.2.8.6.2 Report realms header . 85
5.2.8.6.2.1 Overview. 85
5.2.8.6.2.2 REALMS COUNT field . 85
5.2.8.6.2.3 REALMS DESCRIPTOR LENGTH field. 85
5.2.8.6.2.4 NEXT REALM LOCATOR field. 85
5.2.8.6.3 Realm descriptor . 85
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© ISO/IEC 2025 – All rights reserved

5.2.8.6.3.1 Overview. 85
5.2.8.6.3.2 REALM ID field . 86
5.2.8.6.3.3 REALM RESTRICTIONS field. 86
5.2.8.6.3.4 ACTIVE ZONE DOMAIN ID field . 86
5.2.8.6.3.5 Realm start/end descriptor. 86
5.2.8.6.4 Padding . 87
5.2.9 REPORT ZONE DOMAINS EXT command – 4Ah/07h, DMA . 88
5.2.9.1 Feature Set. 88
5.2.9.2 Description. 88
5.2.9.3 Inputs. 88
5.2.9.3.1 Overview . 88
5.2.9.3.2 REPORTING OPTIONS field. 89
5.2.9.3.3 ZONE DOMAIN LOCATOR field . 89
5.2.9.4 Normal Outputs. 89
5.2.9.5 Error Outputs . 89
5.2.9.6 Input From the Device to the Host Data Structure. 89
5.2.9.6.1 Overview . 89
5.2.9.6.2 Report zone domains header. 90
5.2.9.6.2.1 Overview. 90
5.2.9.6.2.2 LENGTH AVAILABLE field . 90
5.2.9.6.2.3 LENGTH RETURNED field. 90
5.2.9.6.2.4 NUMBER OF SUPPORTED DOMAINS field . 90
5.2.9.6.2.5 ZONE DOMAINS REPORTED field. 90
5.2.9.6.2.6 REPORTING OPTIONS field . 90
5.2.9.6.2.7 ZONE DOMAIN LOCATOR field. 90
5.2.9.6.3 Zone domain descriptor . 91
5.2.9.6.3.1 Overview. 91
5.2.9.6.3.2 ZONE DOMAIN ID field. 91
5.2.9.6.3.3 ZONE COUNT field. 91
5.2.9.6.3.4 START LBA field . 91
5.2.9.6.3.5 END LBA field. 91
5.2.9.6.3.6 ZONE DOMAIN ZONE TYPE field . 91
5.2.9.6.3.7 VALID ZONE DOMAIN ZONE TYPE bit. 91
5.2.9.6.3.8 SHIFTING REALM BOUNDARIES bit. 92
5.2.10 REPORT ZONES EXT command – 4Ah/00h, DMA. 93
5.2.10.1 Feature Set. 93
5.2.10.2 Description. 93
5.2.10.3 Inputs. 93
5.2.10.3.1 Overview . 93
5.2.10.3.2 PARTIAL bit . 93
5.2.10.3.3 REPORTING OPTIONS field. 94
5.2.10.3.4 ZONE LOCATOR field. 94
5.2.10.4 Normal Outputs. 94
5.2.10.5 Error Outputs . 94
5.2.10.6 Input From the Device to the Host Data Structure. 95
5.2.10.6.1 Overview . 95
5.2.10.6.2 ZONE LIST LENGTH field. 95
5.2.10.6.3 SAME field. 96
5.2.10.6.4 MAXIMUM LBA field . 96
5.2.10.6.5 Zone descriptor format . 96
5.2.10.6.5.1 Overview. 96
5.2.10.6.5.2 ZONE TYPE field. 97
5.2.10.6.5.3 ZONE CONDITION field . 98
5.2.10.6.5.4 PREDICTED UNRECOVERED ERRORS bit. 98
5.2.10.6.5.5 NON_SEQ bit. 98
5.2.10.6.5.6 RESET bit . 98
5.2.10.6.5.7 ZONE LENGTH field. 98
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© ISO/IEC 2025 – All rights reserved

5.2.10.6.5.8 ZONE START LBA field . 98
5.2.10.6.5.9 WRITE POINTER LBA field. 98
5.2.11 RESET WRITE POINTER EXT command – 9Fh/04h, Non-Data . 99
5.2.11.1 Feature Set. 99
5.2.11.2 Description. 99
5.2.11.3 Inputs. 99
5.2.11.3.1 Overview . 99
5.2.11.3.2 Zone range specification for the RESET WRITE POINTER EXT command. 99
5.2.11.3.3 RESET WRITE POINTER EXT command processing. 99
5.2.11.4 Normal Outputs. 100
5.2.11.5 Error Outputs . 100
5.2.12 SEQUENTIALIZE ZONE EXT command – 9Fh/05h, Non-Data . 101
5.2.12.1 Feature Set. 101
5.2.12.2 Description. 101
5.2.12.3 Inputs. 101
5.2.12.3.1 Overview . 101
5.2.12.3.2 Zone range specification for the SEQUENTIALIZE ZONE EXT command. 101
5.2.12.3.3 SEQUENTIALIZE ZONE EXT command processing. 101
5.2.12.4 Normal Outputs. 102
5.2.12.5 Error Outputs . 102
5.2.13 ZONE ACTIVATE EXT command – 4Ah/08h, DMA . 103
5.2.13.1 Feature Set. 103
5.2.13.2 Description. 103
5.2.13.2.1 Overview . 103
5.2.13.2.2 Selecting the candidate zones to activate and deactivate . 103
5.2.13.2.3 Prerequisites reported by sense codes. 106
5.2.13.2.4 Prerequisites reported in the Zone Activation Results Header. 106
5.2.13.2.5 Zone Activation processing . 107
5.2.13.3 Inputs. 109
5.2.13.3.1 Overview . 109
5.2.13.3.2 OTHER ZONE DOMAIN ID field . 109
5.2.13.3.3 ALL bit . 109
5.2.13.3.4 NOZSRC field. 109
5.2.13.3.5 RETURN PAGE COUNT field . 110
5.2.13.3.6 ZONE ID field. 110
5.2.13.3.7 AUXNOZ field. 110
5.
...