1、 Reference numberISO/IEC 20062:2001(E)ISO/IEC 2001INTERNATIONAL STANDARD ISO/IEC20062First edition2001-12-15Information technology 8 mm wide magnetic tape cartridge for information interchange Helical scan recording VXA-1 format Technologies de linformation Cartouche de bande magntique de 8 mm de la
2、rge pour change dinformations Enregistrement par balayage en spirale Format VXA-1 Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 8/29/02Published by American National Standards Institute,25 West 43rd Street, Ne
3、w York, New York 10036Copyright 2002 by Information Technology Industry Council (ITI).All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO), InternationalElectrotechnical Commission (IEC), American National Standards Institute (ANSI),
4、 and Information Technology Industry Council(ITI). Not for resale. No part of this publication may be reproduced in any form, including an electronic retrieval system, withoutthe prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW,
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8、is found, please inform the Central Secretariat at the address given below. ISO/IEC 2001 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 photocopying and microfilm, without per
9、mission 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 Switzerland ii ISO/IEC 2001 All rights res
10、ervedISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved iiiContents Section 1 - General 1 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridges 1 2.2 Generating drive 1 2.3 Receiving drive 1 3 Normative references 1 4 Terms and definitions 2 4.1 ac erase 2 4.2 algorithm 2 4.3 Average Signal Amp
11、litude 2 4.4 azimuth 2 4.5 back surface 2 4.6 Beginning of Data (BOD) 2 4.7 Beginning of Tape (BOT) 2 4.8 bit cell 2 4.9 byte 2 4.10 cartridge 2 4.11 Channel bit 2 4.12 Cyclic Redundancy Check (CRC) character 2 4.13 End of Data (EOD) 2 4.14 End of Partition (EOP) 2 4.15 End of Tape (EOT) 2 4.16 Erro
12、r Correcting Code (ECC) 2 4.17 File Mark 2 4.18 Logical Block 2 4.19 magnetic tape 2 4.20 Master Standard Reference Tape 2 4.21 Partition 2 4.22 physical recording density 2 4.23 Reference Field 2 4.24 Secondary Standard Reference Tape (SSRT) 2 4.25 Set Mark 2 4.26 Standard Reference Amplitude (SRA)
13、 3 4.27 Standard Reference Current (Ir) 3 4.28 Tape Reference Edge 3 4.29 Test Recording Current (TRC) 3 4.30 Track 3 4.31 Typical Field 3 5 Conventions and Notations 3 5.1 Representation of numbers 3 5.2 Names 3 6 Acronyms 3 ISO/IEC 20062:2001(E) iv ISO/IEC 2001 All rights reserved7 Environment and
14、 Safety 4 7.1 Testing environment 4 7.2 Operating environment 4 7.3 Storage environment 4 7.4 Transportation 4 7.5 Safety 4 7.6 Flammability 4 Section 2 - Requirements for the case 4 8 Dimensional and mechanical characteristics of the case 4 8.1 General 4 8.2 Overall dimension 5 8.3 Holding areas 5
15、8.4 Cartridge insertion 6 8.5 Window 7 8.6 Loading grips 7 8.7 Label areas 7 8.8 Datum areas and datum holes 7 8.9 Support areas 8 8.10 Recognition holes 9 8.11 Write-inhibit hole 10 8.12 Pre-positioning surfaces 10 8.13 Lid 10 8.14 Cartridge reel lock 11 8.15 Reel access holes 12 8.16 Interface bet
16、ween the reels and the drive spindles 12 8.17 Light path 13 8.18 Position of the tape in the case 14 8.19 Tape path zone 14 8.20 Tape access cavity 15 8.21 Tape access cavity clearance requirements 15 Section 3 - Requirements for the Unrecorded Tape 32 9 Mechanical, physical and dimensional characte
17、ristics of the tape 32 9.1 Materials 32 9.2 Length 32 9.2.1 Length of the magnetic tape 32 9.2.2 Length of leader and trailer tapes 32 9.2.3 Length of the splicing tape 32 9.3 Width 32 9.3.1 Width of magnetic, leader and trailer tape 32 9.3.2 Width and position of the splicing tape 33 9.3.3 Edge wea
18、ve 33 9.4 Discontinuities 34 9.5 Thickness 34 9.5.1 Thickness of the magnetic tape 34 9.5.2 Thickness of leader and trailer tape 34 9.5.3 Thickness of the splice tape 34 9.6 Longitudinal curvature 34 9.7 Cupping 34 9.8 Coating adhesion 34 9.9 Layer-to-layer adhesion 35 9.10 Tensile strength 35 9.10.
19、1 Breaking strength 35 9.10.2 Yield strength 35 9.11 Residual elongation 36 9.12 Electrical resistance of the recording surface 36 ISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved v9.13 Tape winding 36 9.14 Light transmittance of tape 36 10 Magnetic recording characteristics 36 10.1 Test condi
20、tions 37 10.2 Typical Recording Current 37 10.3 Signal Amplitude 37 10.4 Resolution 37 10.5 Signal-to-Noise Ratio 37 10.6 Ease of erasure 38 10.7 Tape quality 38 10.7.1 Missing pulses 38 10.7.2 Missing pulse zone 38 10.7.3 Overwrite 38 Section 4 - Requirements for an Interchanged Tape 38 11 Track Fo
21、rmat 38 11.1 General 38 11.2 Physical Logical Block Format 39 11.2.1 Logical Block Set (LBS) 39 11.2.2 Logical Blocks 40 11.2.3 Segment Packets 40 11.2.4 Segment Overhead Packets 40 11.2.5 Skipped Segment Packets 44 11.2.6 Segment ECC packets 44 11.2.7 Segment flush 45 11.3 Track Packet format 45 11
22、.3.1 Virtual Packet Address 45 11.3.2 Local Packet Address 45 11.3.3 Packet data 47 11.3.4 Packet CRC 48 11.3.5 Packet Reed-Solomon ECC 48 11.4 Control packet format 48 11.5 Packet framing sync 51 12 Tape Format 51 12.1 Track elements 52 12.2 Data track format 52 12.2.1 Order of packets in a data tr
23、ack 52 12.2.2 Rewrite 52 12.3 Gap tracks 53 13 Method of recording 54 13.1 Physical recording density 54 13.1.1 Long-term average bit cell length 54 13.1.2 Short-term average bit cell length 54 13.1.3 Rate of change 54 13.2 Bit shift 54 13.3 Amplitude of Data Signals 54 14 Track geometry 54 14.1 Gen
24、eral 54 14.2 Track pitch 55 14.3 Average track pitch 55 14.4 Track width 55 14.5 Track angle 55 14.6 Track length 55 14.7 Guard band 55 ISO/IEC 20062:2001(E) vi ISO/IEC 2001 All rights reserved14.8 Azimuth angles 56 14.9 Track linearity 56 15 Layout of a tape 56 15.1 General 56 15.2 Beginning of Par
25、tition 56 15.3 Tape Header Record (THR) 56 15.4 Data area 57 15.5 Tape Directory Record 57 15.6 End of Data 58 15.7 End of Partition (EOP) 58 Annexes A - Measurement of Light Transmittance of Tape and Leaders 59 B - The Packet ECC 62 C - The Segment ECC 63 D - Generation of the Segment Overhead CRCs
26、 64 E - Generation of the Segment Data CRC 65 F - Generation of the Packet CRC 66 G - Representation of 8-bit bytes by 14-bit patterns 67 H - Measurement of bit shift 75 J - Tape Count 77 K - Recommendations for transportation 78 ISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved viiForeword ISO
27、 (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 development of International Standards through technical committe
28、es 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-governmental, in liaison with ISO and IEC, also take part in the work
29、. 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 3. The main task of the joint technical committee is to prepare International Stan
30、dards. 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. Attention is drawn to the possibility that some of the elemen
31、ts of this International Standard 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 20062 was prepared by ECMA (as Standard ECMA-316) and was adopted, under a special “fast-track procedure”, by Joint Technical Commit
32、tee ISO/IEC JTC 1, Information technology, in parallel with its approval of national bodies of ISO and IEC. Annexes A to J form a normative part of this International Standard. Annex K is for information only. INTERNATIONAL STANDARD ISO/IEC 20062:2001(E) ISO/IEC 2001 All rights reserved 1Information
33、 technology - 8 mm wide magnetic tape cartridge for information interchange - Helical scan recording - VXA-1 format Section 1 - General 1 Scope This International Standard specifies the physical and magnetic characteristics of an 8 mm wide magnetic tape cartridge to enable physical interchange of su
34、ch cartridges between drives. It also specifies the quality of the recorded signals, the recording method and the recorded format called VXA-1, and thereby allowing data interchange between drives by means of such magnetic tape cartridges. This International Standard specifies three types depending
35、on the length of magnetic tape contained in the case, referred to as Type A, Type B and Type C. Information interchange 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 inf
36、ormation on the interchanged cartridge. If compression is used with this format, it shall be according to International Standard ISO/IEC 15200. 2 Conformance 2.1 Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory
37、requirements of this International Standard throughout the extent of the tape. 2.2 Generating drive A drive generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Standard if all the recordings that it makes on a tape meet the mandatory re
38、quirements of this International Standard. A claim of conformance shall state whether or not the registered compression algorithm specified in ISO/IEC 15200 is implemented within the system to process data from the host prior to allocating data to segment data packets. 2.3 Receiving drive A system r
39、eceiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Standard if it is able to handle any recording on this tape according to this International Standard. A receiving drive shall be able to recognise the use of the data compression algorit
40、hm specified in ISO/IEC 15200. 3 Normative 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 ap
41、ply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of
42、 ISO and IEC maintain registers of currently valid International Standards. ISO/IEC 15200:1996 Information technology - Adaptive Lossless Data Compression algorithm (ALDC) ISO 527-3:1995 Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets ISO 1302:1)Geometri
43、cal Product Specifications (GPS) - Indication of surface texture in technical product documentation ISO/IEC 11576:1994 Information technology - Procedure for the registration of algorithms for the lossless compression of data IEC 60950-1:2001 Information technology equipment - Safety - Part 1: Gener
44、al requirements 1) To be published. (Revision of ISO 1302:1992) ISO/IEC 20062:2001(E) 2 ISO/IEC 2001 All rights reserved4 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 4.1 ac erase: A process of erasure utilising alternating magneti
45、c fields of decaying intensity. 4.2 algorithm: A set of rules for transforming the logical representation of data. 4.3 Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at a density of 2 740 ftpmm measured over a minimum distance of 100 mm, exclusive of
46、 missing pulses. 4.4 azimuth: The angular deviation, in degrees of arc, of the recorded flux transitions on a track from a line normal to the track centreline. 4.5 back surface: The surface of the tape opposite to the magnetic coating used to record data. 4.6 Beginning of Data (BOD): The point in a
47、partition after which a recording of data for interchange commences. 4.7 Beginning of Tape (BOT): The transition from the tape leader to an opaque area of the splice by which a translucent leader tape is joined to the magnetic tape. 4.8 bit cell: A distance along the track allocated for the recordin
48、g of a Channel bit. 4.9 byte: An ordered set of bits acted upon as a unit. 4.10 cartridge: A case containing magnetic tape stored on twin reels. 4.11 Channel bit: A bit after 8-14 transformation. 4.12 Cyclic Redundancy Check (CRC) character: A character derived from information contained in data byt
49、es that is used for error detection. 4.13 End of Data (EOD): The point in a partition before which a recording of data for interchange ends. 4.14 End of Partition (EOP): The virtual point along the length of tape at which a partition ends. 4.15 End of Tape (EOT): The transition from an opaque area of the splice to a translucent trailer tape. 4.16 Error Correcting Code (ECC): A mathematical procedure yielding bytes used for the detection and correction of errors. 4.17 File Mark: A mark recorded on the tape at the request of the host syst
