IEC 62842:2015

Multimedia home server systems - File allocation system with minimized reallocation

IEC 62842:2015 specifies the method for allocating requested file space with no fragmentation, to minimize the need for reallocation of fragmented files in the Universal Disc Format (UDF) file system applied to hard disk drives used in hard disk recorders.

Systèmes de serveur domestique multimédias – Système d'allocation de fichiers avec réallocation réduite le plus possible

L'IEC 62842:2015 spécifie la méthode d'allocation d'espace exigé de fichier sans fragmentation, afin de réduire le plus possible la nécessité de réallocation de fichiers fragmentés dans le système de fichiers au format universel de disque (UDF - universal disk format) appliqué à des lecteurs de disque dur utilisés dans les enregistreurs à disque dur.

General Information

• Status: Published
• Publication Date: 08-Sep-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.160.60 - Multimedia systems and teleconferencing equipment
• Technical Committee: TA 18 - Multimedia home systems and applications for end-user networks
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2015
• Completion Date: 09-Sep-2015

Standards Content (Sample)

IEC 62842 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
Multimedia home server systems – File allocation system with minimized
reallocation
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
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IEC 62842 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
Multimedia home server systems – File allocation system with minimized

reallocation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.60 ISBN 978-2-8322-2843-2

– 2 – IEC 62842:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviations and notation . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 11
3.3 Notation . 11
4 Precondition and the policy . 11
4.1 Preconditions . 11
4.2 Policy . 12
5 Method to be applied-CoPo2 . 12
6 Explanation of basic method CoPo2 . 14
6.1 Basics . 14
6.2 Two choices to apply CoPo2 to an existing partition scheme . 14
6.2.1 General . 14
6.2.2 Applying to an existing partition . 14
6.2.3 Applying to a virtual container partition . 15
6.2.4 Choice conclusion . 16
6.3 Management tables for CoPo2 . 16
6.3.1 General . 16
6.3.2 Region configuration master partition table . 18
6.3.3 Multilevel-divided-partition management tables . 18
6.4 Functions required to implement CoPo2 . 18
6.4.1 General . 18
6.4.2 Initialize . 18
6.4.3 Manage-multilevel-divided-partitions . 18
7 Considerations on the size of management tables . 19
7.1 General . 19
7.2 Multilevel-divided-partition allocation table size . 19
7.2.1 Blu-ray . 19
7.2.2 HDD . 19
8 Applying CoPo2 to UDF . 19
8.1 Storage media to be applied . 19
8.2 Basics when UDF volume format is applied to HDD . 20
8.3 Basics to apply management tables to UDF . 20
8.3.1 Master divided-partition table . 20
8.3.2 Using the implementation use field of the partition descriptor . 20
8.3.3 Multilevel-divided-partition allocation table . 21
9 Data structures applied to UDF . 21
9.1 General . 21
9.1.1 Entity identifier . 21
9.1.2 IdentifierSuffix . 21
9.2 Volume structure . 21
9.2.1 Logical volume descriptor . 21

9.2.2 Logical volume integrity descriptor . 22
9.2.3 Partition descriptor . 23
9.3 File data structures . 24
9.3.1 Partition header descriptor . 24
9.3.2 CoPo2 partition header descriptor . 24
9.3.3 Space bitmap descriptor . 25

Figure 1 – Virtual container partition . 16
Figure 2 – Management tables for CoPo2 . 17

Table 1 – Domain identifier suffix field format . 22
Table 2 – Domain flags . 22
Table 3 – ImplementationUse format . 23
Table 4 – CoPo2ManageTable . 25

– 4 – IEC 62842:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTIMEDIA HOME SERVER SYSTEMS –
FILE ALLOCATION SYSTEM WITH MINIMIZED REALLOCATION

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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International Standard IEC 62842 has been prepared by technical aerea 8: Multimedia home
systems and applications for end-user network of IEC technical committee 100: Audio, video
and multimedia systems and equipment.
The text of this technical report is based on the following documents:
CDV Report on voting
100/2367/CDV 100/2459/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• rec
...

IEC 62842 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multimedia home server systems – File allocation system with minimized
reallocation
Systèmes de serveur domestique multimédias – Système d'allocation de fichiers
avec réallocation réduite le plus possible

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
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IEC 62842 ®
Edition 1.0 2015-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Multimedia home server systems – File allocation system with minimized

reallocation
Systèmes de serveur domestique multimédias – Système d'allocation de

fichiers avec réallocation réduite le plus possible

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.60 ISBN 978-2-8322-1029-9

– 2 – IEC 62842:2015 © IEC 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, abbreviations and notation . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 11
3.3 Notation . 11
4 Precondition and the policy . 11
4.1 Preconditions . 11
4.2 Policy . 12
5 Method to be applied-CoPo2 . 12
6 Explanation of basic method CoPo2 . 14
6.1 Basics . 14
6.2 Two choices to apply CoPo2 to an existing partition scheme . 14
6.2.1 General . 14
6.2.2 Applying to an existing partition . 14
6.2.3 Applying to a virtual container partition . 15
6.2.4 Choice conclusion . 16
6.3 Management tables for CoPo2 . 16
6.3.1 General . 16
6.3.2 Region configuration master partition table . 18
6.3.3 Multilevel-divided-partition management tables . 18
6.4 Functions required to implement CoPo2 . 18
6.4.1 General . 18
6.4.2 Initialize . 18
6.4.3 Manage-multilevel-divided-partitions . 18
7 Considerations on the size of management tables . 19
7.1 General . 19
7.2 Multilevel-divided-partition allocation table size . 19
7.2.1 Blu-ray . 19
7.2.2 HDD . 19
8 Applying CoPo2 to UDF . 19
8.1 Storage media to be applied . 19
8.2 Basics when UDF volume format is applied to HDD . 20
8.3 Basics to apply management tables to UDF . 20
8.3.1 Master divided-partition table . 20
8.3.2 Using the implementation use field of the partition descriptor . 20
8.3.3 Multilevel-divided-partition allocation table . 21
9 Data structures applied to UDF . 21
9.1 General . 21
9.1.1 Entity identifier . 21
9.1.2 IdentifierSuffix . 21
9.2 Volume structure . 21
9.2.1 Logical volume descriptor . 21

9.2.2 Logical volume integrity descriptor . 22
9.2.3 Partition descriptor . 23
9.3 File data structures . 24
9.3.1 Partition header descriptor . 24
9.3.2 CoPo2 partition header descriptor . 24
9.3.3 Space bitmap descriptor . 25

Figure 1 – Virtual container partition . 16
Figure 2 – Management tables for CoPo2 . 17

Table 1 – Domain identifier suffix field format . 22
Table 2 – Domain flags . 22
Table 3 – ImplementationUse format . 23
Table 4 – CoPo2ManageTable . 25

– 4 – IEC 62842:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MULTIMEDIA HOME SERVER SYSTEMS –
FILE ALLOCATION SYSTEM WITH MINIMIZED REALLOCATION

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC
...