Audio archive system - Part 1-2 : BD disk and data migration for long-term audio data storage

IEC 62702-1-2:2022 is available as IEC 62702-1-2:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62702-1-2:2022 specifies a method of data-quality assurance for writable BD disks (hereafter referred to as "disks") which are specified for long-term data storage, and a data migration method which can sustain the recorded data on disks for long-term audio data preservation. The writable disks include BD recordable disk and BD rewritable disk. IEC 62702-1-2:2022 cancels and replaces the first edition published in 2016. This edition constitutes a technical revision. In order to reflect the updates to ISO/IEC 29121:2021, this edition includes the following significant technical changes with respect to the previous edition:
a) ISO/IEC 16963 has been identified as the referee test method for the estimation of lifetime;
b) the ambient conditions for the measurement of maximum data error have been added;
c) the requirements for test drives have been changed considering the use condition of users;
d) the requirements for the estimated lifetime have been defined more clearly;
e) the requirements for the periodic performance test have been defined more clearly.

Système d'archivage audio - Partie 1-2: Disque BD et migration de données pour le stockage à long terme des données audio

IEC 62702-1-2:2022 est disponible sous forme de IEC 62702-1-2:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 62702-1-2:2022 spécifie une méthode d'assurance de la qualité des données pour les disques BD inscriptibles (ci-après dénommés "disques") qui sont spécifiés pour le stockage à long terme des données, ainsi qu'une méthode de migration des données capable de conserver les données enregistrées sur les disques de manière à assurer la conservation à long terme des données audio. Les disques inscriptibles incluent les disques enregistrables BD (Blu-ray Disk) et les disques réenregistrables BD. L'IEC 62702-1-2:2022 annule et remplace la première édition parue en 2016. Cette édition constitue une révision technique. Afin de refléter les mises à jour apportées à l'ISO/IEC 29121:2021, cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) l'ISO/IEC 16963 a été identifiée comme méthode d'essai de référence pour l'estimation de la durée de vie;
b) des conditions ambiantes ont été ajoutées pour le mesurage de l'erreur de données maximale;
c) les exigences relatives aux unités d'essai ont été modifiées en fonction des conditions d'utilisation des utilisateurs;
d) les exigences relatives à la durée de vie estimée ont été définies de manière plus précise;
e) les exigences relatives à l'essai périodique de performances ont été définies de manière plus précise.

General Information

Status
Published
Publication Date
12-Jun-2022
Current Stage
PPUB - Publication issued
Completion Date
13-Jun-2022
Ref Project

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IEC 62702-1-2
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Audio archive system –
Part 1-2: BD disk and data migration for long-term audio data storage
Système d'archivage audio –
Partie 1-2: Disque BD et migration de données pour le stockage à long terme des
données audio
IEC 62702-1-2:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62702-1-2
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Audio archive system –
Part 1-2: BD disk and data migration for long-term audio data storage
Système d'archivage audio –
Partie 1-2: Disque BD et migration de données pour le stockage à long terme des
données audio
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.30; 35.220.30 ISBN 978-2-8322-2292-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62702-1-2:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Disk and lifetime for long-term audio data storage ........................................................... 9

4.1 Disk for long-term audio data storage ..................................................................... 9

4.2 Lifetime estimation ................................................................................................ 10

4.3 B life for long-term audio data storage ............................................................. 10

mig

4.4 Estimated-lifetime rank and display colour ............................................................ 11

4.4.1 Estimated-lifetime rank and display colour identification ................................ 11

4.4.2 B life and display colour indication on disks and packages ....................... 11

mig

5 Test condition, test methods and disks for audio data .................................................... 11

5.1 Ambient conditions of maximum data error measurement...................................... 11

5.2 Test methods ........................................................................................................ 12

5.2.1 Playback test drive ........................................................................................ 12

5.2.2 Test area and sample disk ............................................................................. 12

5.2.3 Recording test drive ....................................................................................... 12

5.2.4 Test drive check ............................................................................................ 12

6 Test result evaluation .................................................................................................... 12

6.1 Initial performance test result evaluation ............................................................... 12

6.2 Periodic performance test result evaluation ........................................................... 13

6.3 Reporting items..................................................................................................... 14

6.3.1 Initial performance test result ........................................................................ 14

6.3.2 Periodic performance test result .................................................................... 14

6.4 Management of reporting items ............................................................................. 14

6.5 Test and migration intervals .................................................................................. 14

7 Prevention of deterioration ............................................................................................ 15

Annex A (informative) Guidelines for usage and indication ................................................... 16

A.1 Usage of lifetime rank ........................................................................................... 16

A.2 Lifetime rank indication and place ......................................................................... 16

A.2.1 Lifetime rank indication .................................................................................. 16

A.2.2 Indication example ......................................................................................... 16

Annex B (informative) Recommendations on handling, storage and cleaning

conditions for BD writable disks ............................................................................................ 17

B.1 Handling ............................................................................................................... 17

B.2 Storage ................................................................................................................. 17

B.3 Cleaning ............................................................................................................... 18

Annex C (informative) Causes of deterioration for BD disks for long-term data storage ........ 19

C.1 Deterioration ......................................................................................................... 19

C.2 Disk structure........................................................................................................ 19

C.3 Causes of deterioration ......................................................................................... 19

C.4 Nature of deterioration .......................................................................................... 20

C.5 Effects of deterioration .......................................................................................... 20

C.6 Unexpected deterioration ...................................................................................... 20

---------------------- Page: 4 ----------------------
IEC 62702-1-2:2022 © IEC 2022 – 3 –

Bibliography .......................................................................................................................... 21

Figure 1 – Data migration flow for the initial and the periodic performance tests ................... 14

Figure A.1 – Indication example ............................................................................................ 16

Table 1 – Category of initial recording performance .............................................................. 13

Table 2 – Category of recording performance at periodic performance test ........................... 13

Table B.1 – Recommended conditions for general storage .................................................... 17

Table B.2 – Recommended conditions for controlled storage ................................................ 17

---------------------- Page: 5 ----------------------
– 4 – IEC 62702-1-2:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO ARCHIVE SYSTEM –
Part 1-2: BD disk and data migration for long-term audio data storage
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

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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8) 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

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62702-1-2 has been prepared by technical area 6: Storage media, storage data structures,

storage systems and equipment, of IEC technical committee 100: Audio, video and multimedia

systems and equipment. It is an International Standard.

This second edition cancels and replaces the first edition published in 2017. This edition

constitutes a technical revision.

In order to reflect the updates to ISO/IEC 29121:2021, this edition includes the following

significant technical changes with respect to the previous edition:

a) ISO/IEC 16963 has been identified as the referee test method for the estimation of lifetime;

b) the ambient conditions for the measurement of maximum data error have been added;

c) the requirements for test drives have been changed considering the use condition of users;

d) the requirements for the estimated lifetime have been defined more clearly;

e) the requirements for the periodic performance test have been defined more clearly.

---------------------- Page: 6 ----------------------
IEC 62702-1-2:2022 © IEC 2022 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3671/CDV 100/3743/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

A list of all parts in the IEC 62702 series, published under the general title Audio archive system,

can be found on the IEC website.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it

contains colours which are considered to be useful for the correct understanding of its

contents. Users should therefore print this document using a colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC 62702-1-2:2022 © IEC 2022
INTRODUCTION

Sound recordings such as music, speech, and storytelling are an important human heritage and

should be preserved for as long as possible. However, we were not able to record sounds in

order to preserve them in the past. The first recording system, the phonautograph, was invented

by Édouard-Léon Scott de Martinville in 1860 and, after that, Thomas Alva Edison invented the

recording and playback system known as the phonograph in 1877.

Although various technologies were invented later, most of them have limitations for audio

archives because storage lifetime is limited, and the sound quality deteriorates when it is

transferred to the next generation of storage device.

The progress of LSI (Large-Scale Integrated Circuit) technology made digital recording of

recorded sound possible. Digital recording is very suitable for audio archiving because the

migration is performed by copying digital data.

For this purpose, various recording materials exist, such as optical disks, magnetic disks,

magnetic tape, and non-volatile memory (such as phase-change memory).

This International Standard specifies physical and logical aspects for standards of audio

archives of various storage types which are typically used for audio archives on the market.

The IEC 62702 series currently consists of:

• Part 1 specifies the minimum requirements on physical aspects of optical disks for digital

sound recordings. Part 1-1 specifies DVD optical disks, and Part 1-2 specifies BD optical

disks.

NOTE DVD optical disks include DVD-R disk, DVD-RW disk, DVD-RAM disk and +R format disk, +RW format

disk. BD optical disks include BD recordable disk and BD rewritable disk.

• Part 2 specifies the minimum requirements for digitization of content, format of digitised

content, content information and media inspection.
---------------------- Page: 8 ----------------------
IEC 62702-1-2:2022 © IEC 2022 – 7 –
AUDIO ARCHIVE SYSTEM –
Part 1-2: BD disk and data migration for long-term audio data storage
1 Scope

This part of IEC 62702 specifies a method of data-quality assurance for writable BD disks

(hereafter referred to as "disks") which are specified for long-term data storage, and a data

migration method which can sustain the recorded data on disks for long-term audio data

preservation. The writable disks include BD recordable disk and BD rewritable disk.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

ISO/IEC 16963:2017, Information technology – Digitally recorded media for information

interchange and storage – Test method for the estimation of lifetime of optical disks for long-

term data storage

ISO/IEC 29121:2021, Information technology – Digitally recorded media for information

interchange and storage – Data migration method for optical disks for long-term data storage

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
B life
mig

lifetime (3.10) for use of data migration (3.6) and identical to B life which is 0,000 001

0,000 1

quantile of the lifetime distribution (i.e. 0,000 1 % failure time) or 99,999 9 % survival lifetime

[SOURCE: ISO/IEC 29121:2021, 3.1]
3.2
B life

5 percentile of the lifetime (3.10) distribution (i.e. 5 % failure time) or 95 % survival lifetime

[SOURCE: ISO/IEC 16963:2017, 3.4]
3.3
(B life)
5 L
95 % lower confidence bound of B life (3.2)
---------------------- Page: 9 ----------------------
– 8 – IEC 62702-1-2:2022 © IEC 2022
[SOURCE: ISO/IEC 16963:2017, 3.5]
3.4
B life

50 percentile of the lifetime (3.10) distribution (i.e. 50 % failure time) or 50 % survival lifetime

[SOURCE: ISO/IEC 16963:2017, 3.6]
3.5
controlled storage condition

well-controlled storage conditions with full-time air conditioning (25 °C and 50 % relative

humidity) in which the lifetime (3.10) of data stored on optical disks
[SOURCE: ISO/IEC 16963:2017, 3.7]
3.6
data migration
process to copy data from one storage device or medium to another
[SOURCE: ISO/IEC 29121:2021, 3.5]
3.7
error correction code
ECC

mathematical computation yielding check bytes used for the detection and correction of errors

in data

Note 1 to entry: For BD recordable disk and BD rewritable disks, the long-distance code (LDC) + burst-indicating

subcode (BIS) defined in ISO/IEC 30190, ISO/IEC 30191, ISO/IEC 30192, and ISO/IEC 30193 is applied.

Note 2 to entry: This note applies to the French language only.

[SOURCE: ISO/IEC 29121:2021, 3.6 modified— Note 1 to entry has been shortened to apply

only to BD disks.]
3.8
error rate

rate of errors or error count measured on the signal at the input of error-correction decoder,

which represents raw-error rate of data recorded on a disk
[SOURCE: ISO/IEC 29121:2021, 3.7]
3.9
initial performance test
first test of the error rate (3.8) of data recorded on a disk before storing
[SOURCE: ISO/IEC 29121:2021, 3.8]
3.10
lifetime
time that information is retrievable in a system (3.16)
[SOURCE: ISO/IEC 29121:2021, 3.9]
3.11
maximum data error

greatest level of error rate (3.8) anywhere in one of the relevant areas on the disk

---------------------- Page: 10 ----------------------
IEC 62702-1-2:2022 © IEC 2022 – 9 –
[SOURCE: ISO/IEC 16963:2017, 3.13, modified — Note 1 to entry has been deleted.]
3.12
RSER
max

greatest level of random symbol error rate measured on the signal in one of the relevant areas

on a disk at the input of error-correction decoder, which excludes burst errors of length greater

than or equal to 40 bytes

Note 1 to entry: See ISO/IEC 30190, ISO/IEC 30191, ISO/IEC 30192, ISO/IEC 30193 and ISO/IEC 16963.

Note 2 to entry: This note applies to the French language only.
3.13
periodic performance test

periodic test of the error rate (3.8) of data recorded on a disk during the storage

[SOURCE: ISO/IEC 29121:2021, 3.15]
3.14
retrievability
ability to recover physical information as recorded
[SOURCE: ISO/IEC 16963:2017, 3.14]
3.15
substrate

layer, which can be transparent or not, provided for the mechanical support of a recording layer

[SOURCE:ISO/IEC ISO/IEC 30193:2021, 3.43]
3.16
system

combination of hardware, software, storage medium and documentation used to record, retrieve

and reproduce information
[SOURCE: ISO/IEC 16963:2017, 3.20]
3.17
uncorrectable error

error in the read-out data that cannot be corrected by the error correction decoders

[SOURCE: ISO/IEC 29121:2021, 3.18]
3.18
X interval
mig
migration interval (year) which is determined by user
[SOURCE: ISO/IEC 29121:2021, 3.19, modified — Note 1 to entry has been deleted.]
4 Disk and lifetime for long-term audio data storage
4.1 Disk for long-term audio data storage

A disk with a specified lifetime should be used for long-term audio data storage. A disk with an

unspecified lifetime should not be used.
---------------------- Page: 11 ----------------------
– 10 – IEC 62702-1-2:2022 © IEC 2022
4.2 Lifetime estimation

For the purposes of this document, the lifetime of a disk shall be derived from the measurements

specified in ISO/IEC 16963. The Eyring method is used for lifetime estimation under controlled

storage conditions (25 °C and 50 % relative humidity).

In ISO/IEC 16963, the estimated lifetime can be defined variously as B life, B life and the

50 5

95 % lower confidence bound of B life [equals (B life) ] and is described as follows.

5 5 L
ˆ ˆˆ
BBexp ln exp β++βx β x
( ) ( )
50 life 50 0 1 10 2 20
ˆˆ ˆ
BBexp ln exp β++βx β x−1,64σˆ
( ) ( )
5 life 5 0 1 10 2 20
where
B is the variable for B life;
50 life 50
B is the variable for B life;
5 life 5

x and x are the temperature-dependent factor and the relative-humidity–dependent factor

10 20

at the controlled storage conditions (25 °C/50 % relative humidity) respectively.

Also, the 95 % lower confidence bound of B life becomes
 ˆˆ ˆ
B exp lnBBexp ln−1,6l4 var nB
( ) ( )
(5 life)L 5 5 5
 L
where
B is the variable for (B life) ;
(5 life)L 5 L
ˆ ˆˆ

β ,,ββ and estimated variance of residual errors are obtained using regression analysis of

0 12
time-to-failure data.
4.3 B life for long-term audio data storage
mig

The estimated lifetime of B life means 5 % of the products reach failure. It is widely used in

other contexts. However, from the viewpoint of the reliability of long-term audio storage to retain

life as the estimated lifetime
the integrity of the original data, it is not appropriate to use B
when determining a test interval and deciding on data migration.

In the case of audio data migration, it is necessary to have a sufficiently low failure probability.

The time at which one millionth of the products reach the failure shall define, in this document,

the estimated lifetime to determine test intervals and migration interval. B life is 0,000 001

0,000 1

quantile of the lifetime distribution (i.e. 0,000 1% failure time) and expressed as B life in this

mig
document. B life can be calculated using B life and B life as follows (see also
mig 50 5
ISO/IEC 29121:2021, Annex E).
= =
= =
= =
---------------------- Page: 12 ----------------------
IEC 62702-1-2:2022 © IEC 2022 – 11 –
lnBB− ln
50 5
ˆ ˆ ˆ
B explnB explnB−=4,75σBˆ expln−4,75
( ) ( ) 
0,000 1 life 0,000 1 50 50
1,64
exp 2, 9 lnB − 1, 9 lnB
( )
5 50
where
B is the variable for B life
0,000 1 life 0,000 1 .
Thus
B××24 365 B exp 2, 9 lnBB− 1, 9 ln
( )
mig life 0,000 1 life 5 50
where
B is the variable for B life
mig life mig .

In actual storage conditions, the temperature and relative humidity can deviate from the

controlled storage condition of 25 °C and 50 % relative humidity, which changes the estimated

lifetime. In this case, the estimated lifetime should be adjusted according to the estimated

lifetime at the actual storage conditions, as specified in ISO/IEC 29121:2021, Annex D.

4.4 Estimated-lifetime rank and display colour
4.4.1 Estimated-lifetime rank and display colour identification

For audio data migration, rank of B life and its identifying display colour are defined as follows.

mig
B life is over 30 years, the display colour is red.
mig
B life is over 60 years, the display colour is green.
mig
B life is over 100 years, the display colour is gold.
mig

Guidelines for use of the ranks of B life and their display colours are shown in Annex A.

mig
4.4.2 B life and display colour indication on disks and packages
mig

The rank of B life, its display colour and the reference-controlled storage condition shall be

mig

indicated on both the disk and the packaging, excluding a two-sided disk. Indication examples

for ranks and their colours are shown in Annex A.
5 Test condition, test methods and disks for audio data
5.1 Ambient conditions of maximum data error measurement

The ambient condition is the surrounding condition in a room where a test drive is

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