SIST EN 62702-1-1:2016
(Main)Audio Archive System - Part 1-1: DVD disk and data migration for long term audio data storage (IEC 62702-1-1:2016)
Audio Archive System - Part 1-1: DVD disk and data migration for long term audio data storage (IEC 62702-1-1:2016)
This part of IEC 62702 specifies a method of data-quality assurance for writable DVD disks
(hereinafter 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 recordable disks such as DVD-R, and +R format, and rewritable
disks such as DVD-RW, +RW format and DVD-RAM.
Audio Archivierungssystem - Teil 1-1: DVD Disk und Datenmigration für die Langzeit Audiodaten Speicherung (IEC 62702-1-1:2016)
Système d'archivage audio - Partie 1-1: Disque DVD et migration de données pour le stockage à long terme des données audio (IEC 62702-1-1:2016)
L'IEC 62702-1-1:2016 spécifie une méthode d'assurance de la qualité des données pour les disques DVD inscriptibles (ci-après appelés "disques") qui sont prévus 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 préservation à long terme des données audio. Les disques inscriptibles incluent les disques enregistrables DVD-R, le format R, ainsi que les disques réenregistrables DVD-RW, RW et DVD-RAM.
Sistem zvočnega arhiva - 1-1. del: DVD-plošča in prenos podatkov za dolgoročno hrambo zvočnih podatkov (IEC 62702-1-1:2016)
Ta del standarda IEC 62702 določa metodo zagotavljanja kakovosti podatkov za zapisljive DVD-plošče (v nadaljevanju plošče), ki so opredeljene za dolgoročno hrambo podatkov, in metodo prenosa podatkov, ki lahko shrani zapisane podatke na ploščah za dolgoročno hrambo zvočnih podatkov. Zapisljive plošče vključujejo snemalne plošče v oblikah zapisov DVD-R in +R ter prepisljive plošče v oblikah zapisov DVD-RW, +RW in DVD-RAM.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62702-1-1:2016
01-oktober-2016
6LVWHP]YRþQHJDDUKLYDGHO '9'SORãþDLQSUHQRVSRGDWNRY]DGROJRURþQR
KUDPER]YRþQLKSRGDWNRY ,(&
Audio Archive System - Part 1-1: DVD disk and data migration for long term audio data
storage (IEC 62702-1-1:2016)
Audio Archivierungssystem - Teil 1-1: DVD Disk und Datenmigration für die Langzeit
Audiodaten Speicherung (IEC 62702-1-1:2016)
Système d'archivage audio - Partie 1-1: Disque DVD et migration de données pour le
stockage à long terme des données audio (IEC 62702-1-1:2016)
Ta slovenski standard je istoveten z: EN 62702-1-1:2016
ICS:
33.160.30 Avdio sistemi Audio systems
35.220.30 2SWLþQHVKUDQMHYDOQH Optical storage devices
QDSUDYH
SIST EN 62702-1-1:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62702-1-1:2016
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SIST EN 62702-1-1:2016
EUROPEAN STANDARD EN 62702-1-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2016
ICS 33.160.30; 35.220.30
English Version
Audio Archive System - Part 1-1: DVD disk and data migration
for long term audio data storage
(IEC 62702-1-1:2016)
Système d'archivage audio - Partie 1-1: Disque DVD et Audio Archivierungssystem - Teil 1-1: DVD Disk und
migration de données pour le stockage à long terme des Datenmigration für die Langzeit Audiodaten Speicherung
données audio (IEC 62702-1-1:2016)
(IEC 62702-1-1:2016)
This European Standard was approved by CENELEC on 2016-06-16. 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
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62702-1-1:2016 E
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SIST EN 62702-1-1:2016
EN 62702-1-1:2016
European foreword
The text of document 100/2449/CDV, future edition 1 of IEC 62702-1-1, prepared by Technical Area 6
“Storage media, storage data structures, storage systems and equipment” 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 62702-1-1:2016.
The following dates are fixed:
• latest date by which the document has to be (dop) 2017-03-16
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2019-06-16
• 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 62702-1-1:2016 was approved by CENELEC as a
European Standard without any modification.
2
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SIST EN 62702-1-1:2016
EN 62702-1-1:2016
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 16448 2002 Information technology - 120 mm DVD - - -
Read-only disk
ISO/IEC 16963 - 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 - Information technology - Digitally recorded - -
media for information interchange and
storage - Data migration method for DVD-
R, DVD-RW, DVD-RAM, +R, and +RW
disks
3
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SIST EN 62702-1-1:2016
IEC 62702-1-1
®
Edition 1.0 2016-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Audio archive system –
Part 1-1: DVD disk and data migration for long term audio data storage
Système d'archivage audio –
Partie 1-1: Disque DVD 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 978-2-8322-3285-9
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
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– 2 – IEC 62702-1-1:2016 IEC 2016
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 . 9
4.3 B Life for long-term audio data storage . 9
mig
4.4 Estimated-lifetime rank and display colour . 10
4.4.1 Estimated-lifetime rank and display colour identification . 10
4.4.2 B Life and display colour indication on disks and packages . 10
mig
5 Test condition, test methods and disks for audio data migration . 10
5.1 Ambient conditions for testing . 10
5.2 Test methods . 11
5.2.1 Playback test drive . 11
5.2.2 Test area of recorded disk . 11
5.2.3 Recording test drive . 11
5.3 Test drive calibration . 11
6 Test result evaluation . 11
6.1 Initial performance test result evaluation . 11
6.2 Periodic performance test evaluation . 12
6.3 Reporting items . 13
6.3.1 Initial performance test result . 13
6.3.2 Periodic performance test result . 13
6.4 Management of reporting item . 13
6.5 Test and migration intervals . 13
7 Prevention of deterioration . 14
Annex A (informative) Guideline of usage and indication . 15
A.1 Usage of lifetime rank . 15
A.2 Lifetime rank indication and place . 15
A.2.1 Lifetime rank indication . 15
A.2.2 Indication example . 15
Annex B (informative) Recommendations on handling, storage and cleaning conditions
for DVD-R, DVD-RW, DVD-RAM, +R, and +RW disks . 16
B.1 Handling . 16
B.2 Storage . 16
B.3 Cleaning . 17
Annex C (informative) Guideline of disk history record . 18
Bibliography . 24
Figure 1 – Data migration flow for DVD-R, DVD-RW, DVD-RAM, +R, and +RW disks . 13
Figure A.1 – Indication example . 15
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IEC 62702-1-1:2016 IEC 2016 – 3 –
Table 1 – Category of initial recording performance . 12
Table 2 – Category of recording performance at periodic performance test . 12
Table B.1 – Recommended conditions for general storage . 16
Table B.2 – Recommended conditions for Controlled storage . 16
Table C.1 – Sectors of the disk history file . 19
Table C.2 – Byte content of sector 0 ~7 of the disk history file . 20
Table C.3 – Byte format of sector 8 to 15 and 9 to the following of the disk history file . 22
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUDIO ARCHIVE SYSTEM –
Part 1-1: DVD 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 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 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 corresponding 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 for 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 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) 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.
International Standard IEC 62702-1-1 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.
The text of this standard is based on the following documents:
CDV Report on voting
100/2449/CDV 100/2518/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.
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SIST EN 62702-1-1:2016
IEC 62702-1-1:2016 IEC 2016 – 5 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
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– 6 – IEC 62702-1-1:2016 IEC 2016
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 recoding was achieved by Edison in 1877.
Although various technologies were invented later, most of them have limitations for audio
archives because storage life time is limited and the sound quality deteriorates when it is
transferred to the next generation storage device.
The progress of LSI technology made digital recording of recorded sound possible. The 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 nonvolatile memory such as a phase change memory.
This International Standard specifies physical and logical aspects for a standard of audio
archives of various storage types which are typically used for audio archives in markets.
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.
Part 2 specifies the minimum requirements for digitization of content, format of digitised
content, content information and media inspection.
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IEC 62702-1-1:2016 IEC 2016 – 7 –
AUDIO ARCHIVE SYSTEM –
Part 1-1: DVD 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 DVD disks
(hereinafter 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 recordable disks such as DVD-R, and +R format, and rewritable
disks such as DVD-RW, +RW format and DVD-RAM.
2 Normative references
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/IEC 16448:2002, Information technology – 120 mm DVD – Read-only disk
ISO/IEC 16963, Information technology – Digitally recorded media for information
interchange and storage – Test method for the estimation of lifetime of optical media for long-
term data storage
ISO/IEC 29121:2013, Information technology – Digitally recorded media for information
interchange and storage – Data migration method for DVD-R, DVD-RW, DVD-RM, +R, and
+RW disks
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
BER max
maximum byte error rate at any consecutive 32 ECC blocks on a disk as measured in the first
pass of the decoder before correction
Note 1 to entry: BER max is applied to DVD-RAM disks.
Note 2 to entry: This note applies to the French language only.
3.2
B Life
mig
lifetime for use of data migration and identical to B Life which is 0,000 001 quantile of
0,0001
the lifetime distribution (i.e. 0,000 1 % failure time) or 99,999 9 % survival lifetime
3.3
B Life
5
5 percentile of the lifetime distribution (i.e. 5 % failure time) or 95 % survival lifetime
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3.4
(B Life)
5 L
95 % lower confidence bound of B Life
5
3.5
B Life
50
50 percentile of the lifetime distribution (i.e. 50 % failure time) or 50 % survival lifetime
3.6
data migration
process to copy data from one storage device or medium to another
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 DVD-R, DVD-RW, DVD-RAM, +R, and +RW disks, the Reed-Solomon product code defined in
ISO/IEC 16448:2002 for DVD-ROM systems is applied.
Note 2 to entry: This note applies to the French language only.
3.8
error rate
rate of errors on the recorded disk measured before error correction is applied
3.9
initial performance test
test of the recording performance of data recorded on a disk before storing
3.10
lifetime
time that information is retrievable in a system
3.11
PIE SUM 8 max
maximum inner parity error at any consecutive 8 ECC blocks on a disk as measured in the
first pass of the decoder before correction
Note 1 to entry: PIE SUM 8 max is applied to DVD-R, DVD-RW, +R, and +RW disks.
Note 2 to entry: This note applies to the French language only.
3.12
periodic performance test
periodic test of the recording performance of data recorded on a disk during the storage
3.13
retrievability
ability to recover physical information as recorded
3.14
substrate
transparent layer of the disk, provided for mechanical support of the recording or recorded
layer, through which the optical beam accesses the recordable/recorded layer
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IEC 62702-1-1:2016 IEC 2016 – 9 –
3.15
system
combination of hardware, software, storage medium and documentation used to record,
retrieve and reproduce information
3.16
uncorrectable error
error in the playback data that could not be corrected by the error correcting decoders
3.17
X Life
mig
migration interval (year) determined by user
3.18
Controlled storage-condition
well-controlled storage conditions with full-time air conditioning (25 °C and 50 % RH) in which
the lifetime of data stored on optical media may be extended
Note 1 to entry: Refer ISO/IEC 16963.
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.
4.2 Lifetime estimation
For the purposes of this standard, 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 /50 %RH).
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 (= (B Life) ) and described as follows.
5 5 L
ˆ
exp (lnB )
B Life =
50
50
ˆ ˆ ˆ
= exp (β +β x +β x ),
0 1 10 2 20
ˆ
exp (lnB )
B Life =
5
5
ˆ ˆ ˆ
ˆ
= exp (β +β x +β x − 1,64σ ),
0 1 10 2 20
where, {x , x } denotes the Controlled storage-condition (25 °C and 50 % RH).
10 20
Also, the 95 % lower confidence bound of B Life becomes
5
ˆ
ˆ
(B Life) ≅ exp(lnB −1,64σ ) .
5
5 L
ˆ ˆ ˆ
ˆ
β ,β , β and estimated variance of residual errors σ are obtained using regression
0 2 2
analysis of 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
5
other contexts. However, from the viewpoint of the reliability of long-term audio storage to
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retain the integrity of the original data, it is not appropriate to use B Life as the estimated
5
lifetime 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 failure shall define the estimated lifetime
in this standard 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
mig
this standard. B Life can be calculated using B Life and B Life as follows (see also
mig 50 5
Annex E in ISO/IEC 29121:2013)
ˆ ˆ
lnB − lnB
ˆ ˆ 50 5
ˆ
B Life=exp(lnB −4,75σ)=exp lnB −4,75
0,000 1 50 50
1,64
ˆ ˆ
= exp(2,9 lnB −1,9 lnB )
5 50
Thus
ˆ ˆ
B Life= B Life= exp(2,9 lnB − 1,9 lnB )
mig 0,000 1 5 50
In actual storage conditions, the temperature and relative humidity may deviate from the
Controlled storage-condition of 25 °C/50 % RH, which changes the estimated lifetime. In this
case, the estimated lifetime should be adjusted according to the estimated lifetime at the
actual storage conditions (see Annex D in ISO/IEC 29121:2013).
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
mig
follows.
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
Guideline 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
mig
be indicated both on disk and package, 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 migration
5.1 Ambient conditions for testing
When performing recordings or playbacks, the air immediately surrounding the disk should
have the following properties:
Recording condition
20 °C to 45 °C
Playback condition
20 °C to 45 °C
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IEC 62702-1-1:2016 IEC 2016 – 11 –
5.2 Test methods
5.2.1 Playback test drive
The playback speed of the test drive should be:
4 × CLV (constant linear velocity),
for DVD-R, DVD-RW, +R format and +RW format disks
or 6 × CLV
for DVD-RAM disk 2 × CAV (constant angular velo-
city), 3 × CAV, or 5 × CAV
5.2.2 Test area of recorded disk
The whole recorded data area should be tested.
In case of a DVD-RAM disk, the replaced data in the defect management area, instead of the
defect data in the user area, should be tested.
5.2.3 Recording test drive
The recording speed of the test drive should be:
4 × CLV or 6 × CLV
For DVD-R, DVD-RW, +R format and +RW format
disks
For a DVD-RAM disk 2 × CAV, 3 × CAV or 5 × CAV
The test drive should implement the multi-session and multi-border method for recordable
disks and the DVD-RW rewritable disk. Archive data shall be recorded in the first session or
border. The history information can be recorded on the second or subsequent session or
border.
The test drive should implement the incremental write method for the DVD-RAM and +RW
format rewritable disks. Data can be written to the formatted disk by simply recording files.
The history information can be recorded on the disk as additional file record.
5.3 Test drive calibration
The playback and recording test drive(s) shall be calibrated by using a calibration disk
prepared by the test drive manufacturer and using the calibration procedure specified by the
manufacturer. The calibration shall be done at the intervals recommended by the
manufacturer.
6 Test result evaluation
6.1 Initial performance test result evaluation
When data are recorded on disks, the initial recording performance on the whole recorded
area shall be checked. The initial recording performance shall be categorized as Level 1, 2
and 3 using PIE SUM 8 max for DVD-R, DVD-RW, +R, and +RW disks, and BER max for
DVD-RAM as shown in Table 1.
At least, the initial recording performance shall be within Level 1. Disks showing the initial
recording performance of Level 2 should not be used for long-term audio data storage, and
those of Level 3 are out of the specification and shall not be used.
If the initial recording performance is worse than Level 1, the performance of the drive used
for recording the data should be verified because PIE SUM 8 max and BER max depend on
the performance of both disks and drives. If the drive is not good, the drive should be
replaced. If the disk is not good, another batch of disks should be use
...
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