1、BSI Standards PublicationFile allocation system with minimized reallocation for multimedia home server (TA 8)BS EN 62842:2015National forewordThis British Standard is the UK implementation of EN 62842:2015.It is identical to IEC 62842:2015. The UK participation in its preparation was entrusted to Te
2、chnicalCommittee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct a
3、pplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 85985 4ICS 33.160.60 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Co
4、mmittee on 29 February 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62842:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62842 December 2015 ICS 33.160.60 English Version File allocation system with minimized reallocation for multimedia home se
5、rver (TA 8) (IEC 62842:2015) Systme dallocation de fichiers avec rallocation minimise pour serveur domestique multimedia (IEC 62842:2015) Multimedia-Homeserversysteme - System zur Dateizuordnung mit minimaler Umverteilung (IEC 62842:2015) This European Standard was approved by CENELEC on 2015-10-14.
6、 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
7、 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 th
8、e 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, Hu
9、ngary, 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 Comit Europen de Normalisation Electrotechn
10、ique Europisches Komitee fr 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 BS EN 62842:2015EN 62842:2015 2 European forewo
11、rd 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
12、 EN 62842:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-07-14 latest date by which the national standards conflicting with the document have to be withdrawn
13、(dow) 2018-10-14 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 62842:2
14、015 was approved by CENELEC as a European Standard without any modification. BS EN 62842:2015EN 62842:2015 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced
15、 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 modificati
16、ons, 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 structure of wri
17、te-once and rewritable media using non-sequential recording for information interchange - series 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
18、 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-s
19、equential recording for information interchange - Part 4: File structure - - BS EN 62842:2015 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
20、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
21、 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 Gener
22、al . 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
23、 . 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
24、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 BS EN 62842:2015IEC 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
25、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 Implementation
26、Use format . 23 Table 4 CoPo2ManageTable 25 BS EN 62842:2015 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 organiza
27、tion 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
28、 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
29、 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 agr
30、eement 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
31、 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 use
32、d or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the co
33、rresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible f
34、or any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees
35、and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8)
36、 Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent righ
37、ts. IEC shall not be held responsible for identifying any or all such patent rights. 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 equipmen
38、t. 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
39、 with the ISO/IEC Directives, Part 2. BS EN 62842:2015IEC 62842:2015 IEC 2015 5 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. A
40、t this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. BS EN 62842:2015 6 IEC 62842:2015 IEC 2015 INTRODUCTION Recently, hard disk and Blu-ray Disc1recorders have become popular in
41、 the home to record television programmes. Normally a Hard Disk Recorder (HDR) is used for time shift and a Blu-ray Disc (BD) is used for library. When an HDR is used for time shift, television programmes are recorded and played, then many of them are deleted to reuse the spaces for other programmes
42、 to be recorded. These programmes are stored as files in a hard disk drive (HDD) using a file system. Continuous recording and deletion of programmes involves the continuous storing and deletion of files in the file system. Television programme streams include at least videos and an electronic progr
43、amme guide (EPG). The HDR stores videos in a long, variable length file depending on the quality and recording hours. Compared with videos, EPG related information is stored in a shorter file or files but is often updated. This continuous creation, deletion and updating of files of different lengths
44、 finally causes the files to be stored in fragments, and the system performance becomes very low. In a computer, defragmentation tools are provided to solve the problem of a fragmented file system. Normally defragmentation with reallocation of files in sequence takes a long time and the end user can
45、not but wait for the completion of the defragmentation, with no other activity. In the home server environment, a smarter solution to resolve this problem needs to be provided. The recent newly developed HDD features will be reflected in the next version of the standard. _ 1Blu-ray Disc is a tradema
46、rk of the Blu-ray Disc Association. This information is given for the convenience of users of this document and does not constitute and endorsement by IEC of the product named. BS EN 62842:2015IEC 62842:2015 IEC 2015 7 MULTIMEDIA HOME SERVER SYSTEMS FILE ALLOCATION SYSTEM WITH MINIMIZED REALLOCATION
47、 1 Scope This International Standard 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. 2 Normative reference
48、s 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. ISO/I
49、EC 13346 (all parts), Information technology Volume and file structure of write-once and rewritable media using non-sequential recording for information 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 infor
