ISO/IEC 13346-4:1999

Information technology — Volume and file structure of write-once and rewritable media using non-sequential recording for information interchange — Part 4: File structure

ISO/IEC 13346 specifies a format and associated system requirements for volume and boot block recognition, volume structure, file structure and record structure for the interchange of information on media between users of information processing systems. The media shall be recorded as if the recording of sectors may be done in any order. Note 1 - The medium is not restricted to being of only one type; the type of medium may be either write once, or read only, or rewritable, or a combination of these types. This International Standard consists of the following five Parts: Part 1: General Part 2: Volume and Boot Block Recognition Part 3: Volume Structure Part 4: File Structure Part 5: Record Structure Annex A - ICB Strategies, is part of this part of ISO/IEC 13346. This part of ISO/IEC 13346 specifies a format and associated system requirements for file structure by specifying: - the placement of files; - the attributes of the files; - the relationship among files of a logical volume; - levels of medium interchange; - requirements for the processes which are provided within information processing systems, to enable information to be interchanged between different systems; for this purpose, it specifies the functions to be provided within systems which are intended to originate or receive media which conform to this part of ISO/IEC 13346.

Technologies de l'information — Structure de volume et de fichier de moyens d'écriture unique et de réécriture utilisant un enregistrement non séquentiel pour l'échange d'information — Partie 4: Structure de fichier

General Information

• Status: Published
• Publication Date: 31-Mar-1999
• ICS: 35.220.20 - Magnetic storage devices in general
• ICS: 35.220.30 - Optical storage devices
• Technical Committee: ISO/IEC JTC 1 - Information technology
• Drafting Committee: ISO/IEC JTC 1 - Information technology
• Current Stage: 9060 - Close of review
• Start Date: 04-Jun-2026

Relations

• Revises: ISO/IEC 13346-4:1995 - Information technology — Volume and file structure of write-once and rewritable media using non-sequential recording for information interchange — Part 4: File structure
• Effective Date: 15-Apr-2008
• Consolidated By: ISO 5457:1999/Amd 1:2010 - Technical product documentation — Sizes and layout of drawing sheets — Amendment 1
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 13346-4
Second edition
1999-04-01
Information technology — Volume and file
structure of write-once and rewritable
media using non-sequential recording for
information interchange —
Part 4:
File structure
Technologies de l'information — Structure de volume et de fichier de
moyens d'écriture unique et de réécriture utilisant un enregistrement non
séquentiel pour l'échange d'information —
Partie 4: Structure de fichier
Reference number
B C
ISO/IEC 13346-4:1999(E)

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ISO/IEC 13346-4:1999(E)
Contents
1 Scope .1
2 Parts references.1
3 Part interface.2
3.1 Input .2
3.2 Output .2
4 Conformance.3
4.1 Conformance of a medium .3
4.2 Conformance of an information processing system .3
5 Definitions .3
5.1 Extent.3
5.2 File set.3
5.3 Group ID.3
5.4 Logical block.3
5.5 Logical volume.3
5.6 Partition .3
5.7 Stream.3
5.8 User ID .3
6 Notation .3
7 Basic types.4
7.1 Recorded address.4
7.1.1 Logical Block Number (RBP 0).4
©  ISO/IEC 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
ISO/IEC Copyright Office • Case postale 56 • CH-1211 Genève 20 • Switzerland
Printed in Switzerland
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© ISO/IEC ISO/IEC 13346-4:1999(E)
7.1.2 Partition Reference Number (RBP 4) . 4
7.2 Descriptor Tag . 4
7.2.1 Tag Identifier (RBP 0) . 4
7.2.2 Descriptor Version (RBP 2). 5
7.2.3 Tag Checksum (RBP 4) . 5
7.2.4 Reserved (RBP 5). 5
7.2.5 Tag Serial Number (RBP 6). 5
7.2.6 Descriptor CRC (RBP 8). 6
7.2.7 Descriptor CRC Length (RBP 10). 6
7.2.8 Tag Location (RBP 12) . 6
8 File structure . 6
8.1 Volume set. 6
8.2 Arrangement of information on a volume set. 6
8.3 Arrangement of information on a logical volume. 6
8.3.1 File Set Descriptor Sequence. 6
8.4 Arrangement of information on a partition . 7
8.5 File set . 7
8.6 Directories . 7
8.6.1 Order of directory descriptors. 8
8.6.2 Directory hierarchy size restrictions . 9
8.7 Pathname. 9
8.7.1 Resolved pathname. 9
8.8 Files. 9
8.8.1 Attributes of a file . 10
8.8.2 Data space of a file . 10
8.8.3 Streams of a File . 11
8.9 Record structure. 11
8.10 Information Control Block (ICB). 11
8.10.1 ICB hierarchy . 12
9 Additional File Data . 12
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ISO/IEC 13346-4:1999(E) © ISO/IEC
9.1 Extended attributes .12
9.2 Stream Directory.14
10 Partition space management.14
10.1 Space sets .14
11 Partition integrity .15
12 Allocation descriptors.15
12.1 Description of Files.16
13 Recording of descriptors .16
14 File Data Structures.16
14.1 File Set Descriptor .16
14.1.1 Descriptor Tag (BP 0) .17
14.1.2 Recording Date and Time (BP 16) .17
14.1.3 Interchange Level (BP 28).17
14.1.4 Maximum Interchange Level (BP 30) .17
14.1.5 Character Set List (BP 32).17
14.1.6 Maximum Character Set List (BP 36) .17
14.1.7 File Set Number (BP 40) .18
14.1.8 File Set Descriptor Number (BP 44) .18
14.1.9 Logical Volume Identifier Character Set (BP 48) .18
14.1.10 Logical Volume Identifier (BP 112).18
14.1.11 File Set Character Set (BP 240) .18
14.1.12 File Set Identifier (BP 304).18
14.1.13 Copyright File Identifier (BP 336) .18
14.1.14 Abstract File Identifier (BP 368) .18
14.1.15 Root Directory ICB (BP 400) .19
14.1.16 Domain Identifier (BP 416) .19
14.1.17 Next Extent (BP 448).19
14.1.18 System Stream Directory (BP 464).19
14.1.19 Reserved (BP 480) .19
14.2 Terminating Descriptor .19
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© ISO/IEC ISO/IEC 13346-4:1999(E)
14.2.1 Descriptor Tag (BP 0). 19
14.2.2 Reserved (BP 16) . 19
14.3 Partition Header Descriptor. 19
14.3.1 Unallocated Space Table (RBP 0) . 20
14.3.2 Unallocated Space Bitmap (RBP 8). 20
14.3.3 Partition Integrity Table (RBP 16). 20
14.3.4 Freed Space Table (RBP 24). 20
14.3.5 Freed Space Bitmap (RBP 32) . 20
14.3.6 Reserved (RBP 40). 20
14.4 File Identifier Descriptor . 20
14.4.1 Descriptor Tag (RBP 0) . 21
14.4.2 File Version Number (RBP 16). 21
14.4.3 File Characteristics (RBP 18). 21
14.4.4 Length of File Identifier (=L_FI) (RBP 19). 22
14.4.5 ICB (RBP 20). 22
14.4.6 Length of Implementation Use (=L_IU) (RBP 36). 22
14.4.7 Implementation Use (RBP 38). 22
14.4.8 File Identifier (RBP [L_IU+38]) . 23
14.4.9 Padding (RBP [L_FI+L_IU+38]). 23
14.5 Allocation Extent Descriptor . 23
14.5.1 Descriptor Tag (BP 0). 23
14.5.2 Previous Allocation Extent Location (BP 16). 23
14.5.3 Length of Allocation Descriptors (=L_AD) (BP 20) . 23
14.6 ICB Tag . 23
14.6.1 Prior Recorded Number of Direct Entries (RBP 0) . 24
14.6.2 Strategy Type (RBP 4). 24
14.6.3 Strategy Parameter (RBP 6). 24
14.6.4 Maximum Number of Entries (RBP 8). 24
14.6.5 Reserved (RBP 10). 24
14.6.6 File Type (RBP 11) . 24
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ISO/IEC 13346-4:1999(E) © ISO/IEC
14.6.7 Parent ICB Location (RBP 12) .25
14.6.8 Flags (RBP 18).25
14.7 Indirect Entry.27
14.7.1 Descriptor Tag (BP 0) .27
14.7.2 ICB Tag (BP 16).27
14.7.3 Indirect ICB (BP 36) .27
14.8 Terminal Entry.27
14.8.1 Descriptor Tag (BP 0) .27
14.8.2 ICB Tag (BP 16).27
14.9 File Entry.27
14.9.1 Descriptor Tag (BP 0) .28
14.9.2 ICB Tag (BP 16).28
14.9.3 Uid (BP 36).28
14.9.4 Gid (BP 40).28
14.9.5 Permissions (BP 44) .28
14.9.6 File Link Count (BP 48) .30
14.9.7 Record Format (BP 50).30
14.9.8 Record Display Attributes (BP 51) .30
14.9.9 Record Length (BP 52) .31
14.9.10 Information Length (BP 56).31
14.9.11 Logical Blocks Recorded (BP 64) .31
14.9.12 Access Date and Time (BP 72) .31
14.9.13 Modification Date and Time (BP 84).31
14.9.14 Attribute Date and Time (BP 96).32
14.9.15 Checkpoint (BP 108).32
14.9.16 Extended Attribute ICB (BP 112) .32
14.9.17 Implementation Identifier (BP 128).32
14.9.18 Unique Id (BP 160) .32
14.9.19 Length of Extended Attributes (=L_EA) (BP 168).32
14.9.20 Length of Allocation Descriptors (=L_AD) (BP 172).32
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© ISO/IEC ISO/IEC 13346-4:1999(E)
14.9.21 Extended Attributes (BP 176) . 32
14.9.22 Allocation Descriptors (BP [L_EA+176]) . 32
14.10 Extended Attributes. 32
14.10.1 Extended Attribute Header Descriptor . 33
14.10.2 Generic format . 33
14.10.3 Character Set Information. 34
14.10.4 Alternate Permissions. 35
14.10.5 File Times Extended Attribute. 38
14.10.6 Information Times Extended Attribute . 39
14.10.7 Device Specification. 40
14.10.8 Implementation Use Extended Attribute . 41
14.10.9 Application Use Extended Attribute . 42
14.11 Unallocated Space Entry. 43
14.11.1 Descriptor Tag (BP 0). 43
14.11.2 ICB Tag (BP 16). 43
14.11.3 Length of Allocation Descriptors (=L_AD) (BP 36) . 43
14.11.4 Allocation Descriptors (BP 40). 43
14.12 Space Bitmap Descriptor. 44
14.12.1 Descriptor Tag (BP 0). 44
14.12.2 Number of Bits (=N_BT) (BP 16). 44
14.12.3 Number of Bytes (=N_B) (BP 20). 44
14.12.4 Bitmap (BP 24) . 44
14.13 Partition Integrity Entry. 44
14.13.1 Descriptor Tag (BP 0). 44
14.13.2 ICB Tag (BP 16). 45
14.13.3 Recording Date and Time (BP 36). 45
14.13.4 Integrity Type (BP 48). 45
14.13.5 Reserved (BP 49) . 45
14.13.6 Implementation Identifier (BP 224) . 45
14.13.7 Implementation Use (BP 256) . 45
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ISO/IEC 13346-4:1999(E) © ISO/IEC
14.14 Allocation descriptors.45
14.14.1 Short Allocation Descriptor .45
14.14.2 Long Allocation Descriptor.46
14.14.3 Extended Allocation Descriptor .46
14.15 Logical Volume Header Descriptor .
...