EN 62842:2015

File allocation system with minimized reallocation for multimedia home server (TA 8)

IEC 62842:2015(E) 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.

Multimedia-Homeserversysteme - System zur Dateizuordnung mit minimaler Umverteilung

Système d'allocation de fichiers avec réallocation minimisée pour serveur domestique multimedia

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.

Sistem dodeljevanja datotek s čim manjšo prerazporeditvijo za multimedijski domači strežnik (TA 8) (IEC 62842:2015)

Ta mednarodni standard določa metodo za dodeljevanje zahtevanega prostora za shranjevanje datotek brez fragmentacije, s čimer bi se zmanjšala potreba za prerazporejanje datotek v datotečnem sistemu Universal Disc Format (UDF), ki se uporablja v trdih diskih v snemalnikih z vgrajenim trdim diskom.

General Information

• Status: Published
• Publication Date: 10-Dec-2015
• Withdrawal Date: 13-Oct-2018
• ICS: 33.160.60 - Multimedia systems and teleconferencing equipment
• Technical Committee: CLC/TC 100X - Audio, video and multimedia systems and equipment and related sub-systems
• Drafting Committee: IEC/TC 100 - IEC_TC_100
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 11-Dec-2015
• Completion Date: 11-Dec-2015
• Ref Project: SIST EN 62842:2016 - File allocation system with minimized reallocation for multimedia home server (TA 8) (IEC 62842:2015)

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2016
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File allocation system with minimized reallocation for multimedia home server (TA 8)
(IEC 62842:2015)
Multimedia-Homeserversysteme - System zur Dateizuordnung mit minimaler
Umverteilung (IEC 62842:2015)
Système d'allocation de fichiers avec réallocation minimisée pour serveur domestique
multimedia (IEC 62842:2015)
Ta slovenski standard je istoveten z: EN 62842:2015
ICS:
33.160.60 9HþSUHGVWDYQLPXOWLPHGLMVNL Multimedia systems and
VLVWHPLLQRSUHPD]D teleconferencing equipment
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62842
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2015
ICS 33.160.60
English Version
File allocation system with minimized reallocation for multimedia
home server (TA 8)
(IEC 62842:2015)
Système d'allocation de fichiers avec réallocation minimisée Multimedia-Homeserversysteme - System zur
pour serveur domestique multimedia Dateizuordnung mit minimaler Umverteilung
(IEC 62842:2015) (IEC 62842:2015)
This European Standard was approved by CENELEC on 2015-10-14. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62842:2015 E
European foreword
The text of document 100/2367/CDV, future edition 1 of IEC 62842, prepared by Technical Area 8
"Multimedia home systems and applications for end-use network" of IEC/TC 100 "Audio, video and
multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and approved
by CENELEC as EN 62842:2015.
The following dates are fixed:
• latest date by which the document has to be (dop) 2016-07-14
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2018-10-14
• latest date by which the national
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62842:2015 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
ISO/IEC 13346 series Information technology - Volume and file - series
structure of write-once and rewritable
media using non-sequential recording for
information interchange
ISO/IEC 13346-1 1995 Information technology - Volume and file - -
structure of write-once and rewritable
media using non-sequential recording for
information interchange -- Part 1: General
ISO/IEC 13346-3 1999 Information technology - Volume and file - -
structure of write-once and rewritable
media using non-sequential recording for
information interchange - Part 3: Volume
structure
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
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

IEC 62842:2015 © IEC 2015 – 3 –
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 repre
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