1、INCITS/ISO/IEC 10995-2008 (ISO/IEC 10995:2008, IDT) Information technology Digitally recorded mediafor information interchange and storage Test method for the estimationof the archival lifetime of optical mediaINCITS/ISO/IEC 10995-2008(ISO/IEC 10995:2008, IDT)INCITS/ISO/IEC 10995-2008 ii ITIC 2008 A
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5、given below. Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard. Date of ANSI Approval: 7/30/2008Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036 Copyright 2008 by Information Technology I
6、ndustry Council (ITI). All rights reserved. These materials are subject to copyright claims of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not for r
7、esale. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of Amer
8、ica INCITS/ISO/IEC 10995-2008 ITIC 2008 All rights reserved iii Contents Page Foreword iv Introduction .v 1 Scope 1 2 Conformance 1 3 Normative references .2 4 Terms and definitions 2 5 Conventions and notations 4 5.1 Representation of numbers .4 5.2 Names .4 6 List of acronyms .4 7 Measurements 4 7
9、.1 Summary .4 7.1.1 Stress Incubation and Measuring 4 7.1.2 Assumptions 4 7.1.3 Error Rate .5 7.1.4 Data Quality 5 7.1.5 Regression5 7.2 Test specimen 5 7.3 Recording conditions .5 7.3.1 Recording test environment 6 7.3.2 Recording method 6 7.4 Playback conditions .6 7.4.1 Playback tester .6 7.4.2 P
10、layback test environment 6 7.4.3 Calibration 6 7.5 Disk testing locations.7 8 Accelerated stress test 7 8.1 General7 8.2 Stress conditions .7 8.2.1 General7 8.2.2 Temperature (T) 8 8.2.3 Relative humidity (RH) .8 8.2.4 Incubation and Ramp Profiles .8 8.3 Measuring Time intervals .9 8.4 Stress Condit
11、ions Design 9 8.5 Media Orientation . 10 9 Data Evaluation 10 9.1 Time-to-failure 10 9.2 Eyring acceleration model (Eyring Method) 10 9.3 Data analysis 11 Annex A (normative) Data Analysis Steps Outline for Calculation of Media Life . 12 Annex B (normative) Analysis for Calculation of Media Life . 1
12、3 Annex C (normative) Uncontrolled Ambient Condition Media Life Calculation . 25 Annex D (informative) Truncated Test Method (Determination of Media Life Lower Bound). 26 Annex E (informative) Bootstrap Method . 29 Annex F (informative) Relation between BER and PI Sum 8 . 31 Bibliography 32 INCITS/I
13、SO/IEC 10995-2008 iv ITIC 2008 All rights reserved Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the de
14、velopment of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-govern
15、mental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of
16、 the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote
17、. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 10995 was prepared by Ecma International (as ECMA-379) and was adopted, under a spe
18、cial fast-track procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national bodies of ISO and IEC. INCITS/ISO/IEC 10995-2008 ITIC 2008 All rights reserved v Introduction Markets and industry have developed the common understanding that the
19、 property referred to as the archival life of data recorded to optical media plays an increasingly important role for the intended applications. The existing standard test methodologies for recordable media include magneto-optical media and recordable compact disk systems. It was agreed that the pro
20、ject represented by this International Standard be undertaken in order to provide a methodology that includes the testing of newer, currently available products. The Optical Storage Technology Association (OSTA) initiated work on this subject and developed the initial drafts. Following that developm
21、ent, the project was moved to Ecma International TC 31 for further development and finalization. OSTA and Ecma wish to thank the members and organizations in NIST, CDs21 Solutions, and DCAj for their support of the development of this International Standard. AMERICAN NATIONAL STANDARD INCITS/ISO/IEC
22、 10995-2008 ITIC 2008 All rights reserved 1 Information technology Digitally recorded media for information interchange and storage Test method for the estimation of the archival lifetime of optical media 1 Scope This International Standard specifies an accelerated aging test method for estimating t
23、he life expectancy for the retrievability of information stored on recordable or rewritable optical disks. This test includes details on the following formats: DVD-R/-RW/-RAM, +R/+RW. It may be applied to additional optical disk formats with the appropriate specification substitutions and may be upd
24、ated by committee in the future as required. This International Standard includes the following: stress conditions; assumptions; ambient conditions: controlled storage condition, e.g. 25 C and 50 % RH, using the Eyring model, uncontrolled storage condition, e.g. 30 C and 80 % RH, using the Arrhenius
25、 model; evaluation system description; specimen preparation; data acquisition procedure; data interpretation. The methodology includes only the effects of temperature (T) and relative humidity (RH). It does not attempt to model degradation due to complex failure mechanism kinetics, nor does it test
26、for exposure to light, corrosive gases, contaminants, handling, and variations in playback subsystems. Disks exposed to these additional sources of stress or higher levels of T and RH are expected to experience shorter usable lifetimes. 2 Conformance Media tested by this methodology shall conform to
27、 all normative references specific to that media format. INCITS/ISO/IEC 10995-2008 2 ITIC 2008 All rights reserved 3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refer
28、ences, 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 16449:2002, Information technology 80 mm DVD Read-only disk ISO/IEC 17341:2006, Information technology Data Interchange on 120 mm and
29、80 mm Optical Disk using +RW Format Capacity: 4,7 Gbytes and 1,46 Gbytes per Side (Recording speed up to 4X) ISO/IEC 17342:2004, Information technology 80 mm (1,46 Gbytes per side) and 120 mm (4,70 Gbytes per side) DVD re-recordable disk (DVD-RW) ISO/IEC 17344:2006, Information technology Data Inter
30、change on 120 mm and 80 mm Optical Disk using +R Format Capacity: 4,7 Gbytes and 1,46 Gbytes per Side (Recording speed up to 16X) ISO/IEC 17592:2004, Information technology 120 mm (4,7 Gbytes per side) and 80 mm (1,46 Gbytes per side) DVD rewritable disk (DVD-RAM) ISO/IEC 23912:2005, Information tec
31、hnology 80 mm (1,46 Gbytes per side) and 120 mm (4,70 Gbytes per side) DVD Recordable Disk (DVD-R) ISO/IEC 25434:2007, Information technology Data interchange on 120 mm and 80 mm optical disk using +R DL format Capacity: 8,55 Gbytes and 2,66 Gbytes per side (recording speed up to 8x) ISO/IEC 26925:2
32、006, Information technology Digital storage media for information interchange Data Interchange on 120 mm and 80 mm Optical Disk using +RW HS Format Capacity: 4,7 Gbytes and 1,46 Gbytes per Side (Recording speed 8X) ISO/IEC 29642:2007, Information technology Data Interchange on 120 mm and 80 mm optic
33、al disk using +RW DL format Capacity: 8,55 Gbytes and 2,66 Gbytes per side (recording speed 2,4x) 4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 4.1 archival ability of a medium or system to maintain the retrievability of recorded information fo
34、r a specified extended period of years 4.2 Arrhenius method accelerated aging model based on the effects of temperature 4.3 baseline initial test analysis measurements (e.g. initial error rate) after recording and before exposure to a stress condition; measurement at stress time t=0 hours INCITS/ISO
35、/IEC 10995-2008 ITIC 2008 All rights reserved 3 4.4 bootstrap method statistical method for estimating the sampling distribution by re-sampling with replacement from the original sample NOTE See Annex E. 4.5 Eyring Method accelerated aging model based on the effects of temperature and relative humid
36、ity 4.6 error rate rate of errors on the sample disk measured before error correction is applied 4.7 incubation process of enclosing and maintaining controlled test sample environments 4.8 life expectancy LE length of time estimation that information is predicted to be retrievable in a system while
37、in a specified environmental condition 4.9 maximum error rate maximum of the error rate measured anywhere in one of the relevant areas on the disk NOTE 1 For DVD-R/RW and +R/+RW this is the Maximum PI Sum 8. NOTE 2 For DVD-RAM this is the Maximum BER. 4.10 retrievability ability to recover physical
38、information as recorded 4.11 stress temperature and relative humidity variables to which the sample is exposed for the duration of test incubation intervals 4.12 system combination of hardware, software, storage medium and documentation used to record, retrieve and reproduce information 4.13 uncorre
39、ctable error error in the playback data that was not corrected by the error correcting decoders NOTE For DVD-R/RW, +R/+RW, and DVD-RAM, this is an error that is uncorrected by the Reed-Solomon product code defined in ISO/IEC 16448 for DVD ROM systems. INCITS/ISO/IEC 10995-2008 4 ITIC 2008 All rights
40、 reserved 5 Conventions and notations 5.1 Representation of numbers A measured value is rounded off to the least significant digit of the corresponding specified value. For instance, it implies that a specified value of 1,26 with a positive tolerance of + 0,01 and a negative tolerance of - 0,02 allo
41、ws a range of measured values from 1,235 to 1,275. 5.2 Names The names of entities, e.g. specific tracks, fields, zones, etc. are given a capital initial. 6 List of acronyms BER byte error rate LCL lower confidence limit LE life expectancy PI parity (of the) inner (code) 7 Measurements 7.1 Summary 7
42、.1.1 Stress Incubation and Measuring A sampling of disks will be measured at 4 stress conditions plus a control disk at room ambient condition. A minimum number of 20 disks will be included as a group for each stress condition as shown in Table 2. Each stress conditions total time will be divided in
43、to interval time periods. Each disk in each group of disks will have their initial error rates measured before their exposure to stress conditions. Thereafter, each disk will be measured for their error rates after each stress condition incubation time interval. The control disk will also be measure
44、d following each incubation time interval. 7.1.2 Assumptions This Standard makes the following assumptions for applicability of media to be tested: specimen life distribution is appropriately modelled by a statistical distribution, the Eyring model can be used to model acceleration with the two stre
45、sses involved (temperature and relative humidity), the dominant failure mechanism acting at the usage condition is the same as that at the accelerated conditions, the compatibility of the disk and drive combination will affect the disks initial recording quality and the resulting archival test outco
46、me, a hardware and software system needed to read the disk will be available at the time the retrievability of the information is attempted, the recorded format will be recognizable and interpretable by reading software. INCITS/ISO/IEC 10995-2008 ITIC 2008 All rights reserved 5 7.1.3 Error Rate Of a
47、ll specimen media the Error rate shall be measured in the disk testing locations as defined in 6.5. For each sample the Maximum error rate shall be determined. Each DVD-R/RW, +R/+RW disk will have their maximum PI Sum 8 (Max PI-8) determined. Each DVD-RAM disk will have its maximum byte error rate (
48、Max BER) determined. Other disk formats not referenced in this document will have the maximum of their defined error rates determined. Data collected at each time interval for each individual disk are then used to determine the estimated lifetime for that disk at that stress condition. 7.1.3.1 PI Su
49、m 8 Per ISO/IEC 16448:2002, a row in an ECC block that has at least 1 byte in error constitutes a PI error. PI Sum 8 is measured over 8 ECC blocks. In any 8 consecutive ECC blocks the total number of PI errors, also called PI Sum 8, before error correction shall not exceed 280. 7.1.3.2 BER The number of erroneous symbols shall be measured at any consecutive 32 ECC blocks in the first pass of the decoder before correction. The BER is the number of erroneous symbols divided by th
