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1、Reference number ISO/IEC 17462:2000(E) ISO/IEC 2000 INTERNATIONAL STANDARD ISO/IEC 17462 First edition 2000-09-15 Information technology 3,81 mm wide magnetic tape cartridge for information interchange Helical scan recording DDS-4 format Technologies de linformation Cartouche bande magntique de 3,81
2、 mm de large pour lchange dinformation Enregistrement par balayage en spirale Format DDS-4 ISO/IEC 17462:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces wh
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5、 that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO/IEC 2000 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocop
6、ying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerla
7、nd ii ISO/IEC 2000 All rights reserved ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservediii Contents Section 1 - General1 1Scope1 2Conformance1 2.1Magnetic tape cartridge1 2.2Generating drive1 2.3Receiving drive1 3Normative references2 4Definitions2 4.1Absolute Frame Number (AFN)2 4.2a.c. e
8、rase2 4.3Access Point2 4.4algorithm2 4.5Area ID2 4.6Average Signal Amplitude2 4.7azimuth2 4.8back surface2 4.9byte2 4.10cartridge2 4.11Channel bit2 4.12Codeword2 4.13Data Format ID2 4.14Early Warning Point (EWP)2 4.15End of Data (EOD)2 4.16Entity2 4.17Error Correcting Code (ECC)2 4.18flux transition
9、 position2 4.19flux transition spacing2 4.20Fragment2 4.21Frame3 4.22Housekeeping Frame3 4.23Logical Beginning of Tape (LBOT)3 4.24magnetic tape3 4.25Master Standard Amplitude Calibration Tape3 4.26Master Standard Reference Tape3 4.27Optimum Recording Field3 4.28Partition Boundary3 4.29Physical Begi
10、nning of Tape (PBOT)3 4.30Physical End of Tape (PEOT)3 4.31physical recording density3 4.32pre-recording condition3 4.33processing3 4.34processed data3 4.35Processed Record3 4.36Processed Record Sequence3 ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservediv 4.37record3 4.38Reference Recordin
11、g Field3 4.39reprocessing3 4.40Secondary Standard Amplitude Calibration Tape3 4.41Secondary Standard Reference Tape3 4.42Separator Mark4 4.43Standard Reference Amplitude4 4.44Tape Reference Edge4 4.45Test Recording Current4 4.46track4 4.47Unprocessed Record4 4.48Virtual End of Tape (VEOT)4 5Conventi
12、ons and Notations4 6Acronyms4 7Environment and safety4 7.1Testing environment4 7.2Operating environment5 7.3Storage environment5 7.4Transportation5 7.5Safety5 7.6Flammability5 Section 2 - Requirements for the case6 8Dimensional and mechanical characteristics of the case6 8.1General6 8.2Overall dimen
13、sions6 8.3Loading grip7 8.4Holding areas7 8.5Notches of the lid7 8.6Lid dimensions7 8.7Optical detection of the beginning and end of tape8 8.8Bottom side8 8.8.1Locking mechanism of the slider8 8.8.2Access holes9 8.8.3Recognition, sub-datums, and write-inhibit holes9 8.8.4Datum holes11 8.8.5Access ro
14、om for tape guides11 8.8.6Holes for accessing the hubs11 8.8.7Internal structure of the lower half11 8.8.8Light path12 8.8.9Support Areas13 8.8.10Datum Areas13 8.8.11Relationship between Support and Datum Areas and Reference Plane Z13 8.9Hubs13 8.10Attachment of leader and trailer tapes14 8.11Interf
15、ace between the hubs and the drive spindles14 8.12Opening of the lid14 8.13Release of the hub locking mechanism14 8.14Label areas14 8.15Requirement for autoloaders15 Section 3 - Requirements for the unrecorded tape28 9Mechanical, physical and dimensional characteristics of the tape28 9.1Materials28
16、ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservedv 9.2Tape length28 9.2.1Length of magnetic tape28 9.2.2Length of leader and trailer tapes28 9.2.3Length of splicing tapes28 9.3Tape width28 9.3.1Width of magnetic tape28 9.3.2Width of leader and trailer tapes28 9.3.3Width and position of spli
17、cing tape28 9.3.4Edge weave28 9.4Discontinuities29 9.5Tape thickness30 9.5.1Thickness of magnetic tape30 9.5.2Thickness of leader and trailer tape30 9.5.3Thickness of splicing tape30 9.6Longitudinal curvature30 9.7Cupping30 9.8Coating adhesion30 9.9Layer-to-layer adhesion31 9.10Tensile strength31 9.
18、10.1Breaking strength31 9.10.2Yield strength31 9.11Residual elongation31 9.12Flexural rigidity31 9.13Electrical resistance of coated surfaces32 9.14Abrasivity32 9.15Light transmittance of the tape32 9.16Media Recognition System (MRS)33 10Magnetic recording characteristics33 10.1Optimum Recording Fie
19、ld34 10.2Signal Amplitude34 10.3Resolution34 10.4Overwrite34 10.5Ease of erasure35 10.6Tape quality35 10.6.1Missing pulses35 10.6.2Missing pulse zone35 10.7Signal-to-Noise Ratio (SNR) characteristic35 Section 4 - Requirements for an interchanged tape35 11Format35 11.1General35 11.2Basic Groups36 11.
20、2.1Entity36 11.2.2Group Information Table37 11.2.3Block Access Table (BAT)39 11.3Sub-Groups42 11.3.1G1 Sub-Group42 11.3.2G2 Sub-Group - Randomizing42 11.3.3G3 Sub-Group43 11.3.4G4 Sub-Group44 11.3.5Main Data Fragment48 11.3.6Summary of the transformation of a Basic Group50 11.4Sub code information50
21、 11.4.1Pack Item Number 050 11.4.2Pack Item Number 150 ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservedvi 11.4.3Pack Item Number 251 11.4.4Pack Item Number 351 11.4.5Pack Item Number 451 11.4.6Pack Item Number 552 11.4.7Pack Item Number 653 11.4.8Pack Item Number 753 11.4.9Pack Item Number
22、 854 11.4.10 Pack Item Number 954 11.4.11 Pack Item Number 1054 11.4.12 Pack Item Number 1155 11.4.13 Pack Item Number 1255 11.4.14 Pack Item Number 1356 11.4.15 Pack Item Number 1456 11.4.16 Pack Item Number 1557 11.5Sub code location57 11.5.1Sub code Pack Items on a Single Data Space tape57 11.5.2
23、Sub code Pack Items on a partitioned tape57 12Method of recording58 12.1Physical recording density58 12.2Long-term average bit cell length58 12.3Short-term average bit cell length58 12.4Rate of change58 12.5Bit shift58 12.6Read signal amplitude58 12.7Maximum recorded levels58 13Track geometry58 13.1
24、Track configuration58 13.2Average track pitch59 13.3Variations of the track pitch59 13.4Track width59 13.5Track angle59 13.6Track edge linearity59 13.7Track length60 13.8Ideal tape centreline60 13.9Azimuth angles60 14Recorded patterns60 14.1Recorded Main Data Fragment60 14.2Preamble Zone, Margin Zon
25、es60 15Format of a track60 15.1Format of a track60 15.2Positioning accuracy60 15.3Tracking scheme61 16Layout of a Single Data Space tape61 16.1Device Area61 16.2Reference Area62 16.3Position Tolerance Band No. 162 16.4System Area62 16.4.1System Preamble62 16.4.2System Log62 16.4.3System Postamble62
26、16.4.4Position Tolerance Band No. 262 16.4.5Vendor Group Preamble62 ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservedvii 16.5Data Area62 16.5.1Vendor Group62 16.5.2Recorded Data Group63 16.5.3ECC363 16.5.4Repeated Frames63 16.5.5Appending and overwriting64 16.6EOD Area65 16.7Post-EOD Area65
27、 16.8Early Warning Point - (EWP)66 16.9Initialization66 17Layout of a partitioned tape66 17.1Overall magnetic tape layout67 17.1.1Device Area67 17.1.2Partition 167 17.1.3Partition 068 17.2Area ID68 17.3System Area Pack Items No. 668 17.4Empty partitions69 17.4.1Empty partition 169 17.4.2Empty partit
28、ion 069 17.5Initialization of partitioned tapes69 18Housekeeping Frames69 18.1Amble Frames69 18.2System Log Frames69 18.3Tape Management Frames70 Annexes A - Measurement of the light transmittance of the prisms71 B - Measurement of light transmittance of tape and leaders73 C - Measurement of Signal-
29、to-Noise Ratio76 D - Method for determining the Nominal and the Maximum Allowable Recorded Levels77 E - Representation of 8-bit bytes by 10-bit patterns78 F - Measurement of bit shift90 G - Measurement of track edge linearity92 H - Tape abrasicity measurement procedure93 J - Method of measurement of
30、 the track width95 K - Recognition Holes97 L - Means to open the lid98 M - Recommendations for transportation100 N - Read-After-Write101 P - Example of the content of a Basic Group No. 0102 ISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reservedviii Foreword ISO (the International Organization fo
31、r 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 development of International Standards through technical committees established by the respective or
32、ganization 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-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are draft
33、ed in accordance with the rules given in the ISO/IEC Directives, Part 3. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for votin
34、g. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO and IEC shall not be held responsible for iden
35、tifying any or all such patent rights. This International Standard was prepared by collaboration between the JISC and the ECMA Standard Bodies (as Standard JIS X 6137 and ECMA-288) and was adopted, under a special “fast-track procedure” by Joint Technical Committee ISO/IEC JTC 1, Information Technol
36、ogy, in parallel with its approval by national bodies of ISO and IEC. Annexes A, B, C, D, E, F, G, H and J form a normative part of this International Standard. Annexes K, L, M, N and P are for information only. INTERNATIONAL STANDARDISO/IEC 17462:2000 (E) ?ISO/IEC 2000 - All rights reserved1 Inform
37、ation technology 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-4 format Section 1 - General 1Scope This International Standard specifies the physical and magnetic characteristics of a 3,81 mm wide magnetic tape cartridge to enable physical interchang
38、eability of such cartridges between drives. It also specifies the quality of the recorded signals, the recording method and the recorded format - called Digital Data Storage 4 (DDS-4) - thereby allowing data interchange between drives by means of such magnetic tape cartridges. Information interchang
39、e between systems also requires, at a minimum, agreement between the interchange parties upon the interchange code(s) and the specifications of the structure and labelling of the information on the interchanged cartridge. Under information interchange circumstances in which a processing algorithm, e
40、.g. for lossless data compression as specified in ISO/IEC 11558, is applied to the host data prior to recording on the tape and a complementary reprocessing algorithm is applied after the data is read from the tape, agreement upon these by the interchange parties is also required. 2Conformance 2.1Ma
41、gnetic tape cartridge A tape cartridge shall be in conformance with this International Standard if it meets all the mandatory requirements specified herein. The tape requirements shall be satisfied throughout the extent of the tape. For each recorded Entity any algorithm for lossless data compressio
42、n used for processing the data therein shall have been registered, and according to ISO/IEC 11576 the corresponding numerical identifier shall be recorded in Byte No. 3 of the Entity Header. 2.2Generating drive A drive generating a magnetic tape cartridge for interchange shall be in conformance with
43、 this International Standard if all recordings on the tape meet the mandatory requirements of this International Standard, and if either or both methods of appending and overwriting are implemented. A claim of conformance shall state which of the following optional features are implemented and which
44、 are not ?the performing of a Read-After-Write check and the recording of any necessary repeated frames; ?the generation of ECC3 Frames. In addition a claim of conformance shall state ?whether or not one, or more, registered algorithm(s) are implemented within the system and are able to process data
45、 received from the host prior to collecting the data into Basic Groups, and ?the algorithm registration identification number(s) of the implemented algorithm(s). 2.3Receiving drive A drive receiving a magnetic tape cartridge for interchange shall be in conformance with this International Standard if
46、 it is able to handle any recording made on the tape according to this International Standard. In particular it shall ?be able to recognize repeated frames and to make available to the host, data and Separator Marks from only one of these frames; ?be able to recognize an ECC3 frame, and ignore it if
47、 the system is not capable of using ECC3 check bytes in a process of error correction; ?be able to recognize processed data within an Entity, identify the algorithm used, and make the algorithm registration number available to the host; ?be able to make processed data available to the host. In addit
48、ion a claim of conformance shall state ?whether or not the system is capable of using ECC3 check bytes in a process of error correction; ?whether or not one or more reprocessing algorithm(s) are implemented within the system, and are able to be applied to processed data prior to making such data ava
49、ilable to the host; ISO/IEC 17462:2000 (E) 2?ISO/IEC 2000 - All rights reserved ?the algorithm registration number(s) of the processing algorithm(s) for which a complementary reprocessing algorithm is implemented. 3Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged
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