1、INTERNATIONAL STANDARD ISOJIEC 12248 First edition 1993-12-15 Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DATA/DAT-DC format using 60 m and 90 m length tapes Technologies de /information - Cartouche de bande magnetique de 3,81
2、mm de large pour Mchange dinformation - Enregistrement par balayage en spirale - Format DATNDAT-DC utilisant des bandes de 60 m et 90 m de long Reference number ISO/IEC 12248:1993(E) Processed and adopted by ASC NCITS and approved by ANSI as an American National Standard.Date of ANSI Approval: 5/12/
3、98Published by American National Standards Institute,11 West 42nd Street, New York, New York 10036Copyright 1999 by Information Technology Industry Council (ITI).All rights reserved.These materials are subject to copyright claims of International Standardization Organization (ISO),International Elec
4、trotechnical Commission (IEC), American National Standards Institute (ANSI), andInformation Technology Industry Council (ITI). Not for resale. No part of this publication may be reproducedin any form, including an electronic retrieval system, without the prior written permission of ITI. All requests
5、pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC 20005.Printed in the United States of AmericaAdopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 5/12/98Published by America
6、n National Standards Institute,25 West 43rd Street, New 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 Commissio
7、n (IEC), American National Standards Institute (ANSI), 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 st
8、andard should be submitted to ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaISO/IEC 12248:1993 (E) Contents 1 Scope 2 Conformance 2.1 Magnetic tape cartridge 2.2 Generating system 2.3 Receiving system 3 Normative references 4 Definitions 4.1 4.2 4.3 4.4 4.5 4.6
9、4.7 4.8 4.9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 Absolute Frame Number (AFN) algorithm Area ID Automatic Track Finding (ATF) Average Signal Amplitude azimuth back surface byte cartridge Channel Bit Codeword Data Format ID End of Data (EOD) End of Information (EOI) End of
10、Partition (EOP) entity Error Correcting Code (ECC) flux transition position flux transition spacing frame group Logical Beginning of Tape (LBOT) Page 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 (D ISO/IEC 1993 All rights reserved. Unless otherwise specified, no part of this publication
11、 may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office l Case postale 56 l CH-1211 Gerkve 20 l Switzerland Printed in Switzerland ii ISO/IEC 12248: 1993 (E)
12、 4.23 4.24 4.25 4.26 4.27 4.28 4.29 4.30 4.31 4.32 4.33 4.34 4.35 4.36 4.37 4.38 4.39 4.40 4.41 4.42 4.43 4.44 4.45 4.46 Logical End of Tape (LEOT) magnetic tape master reference Master Standard Amplitude Calibration Tape Master Standard Reference Tape Optimum Recording Field partition partition ref
13、erence Physical Beginning of Tape (PBOT) Physical End of Tape (PEOT) physical recording density pre-recording condition processed record processed record sequence processing record Reference Recording Field Secondary Standard Amplitude Calibration Tape Secondary Standard Reference Tape Separator Mar
14、k Standard Referemce Amplitude tape noise amplitude Tape Reference Edge track 5 Environment and safety 5.1 Testing environment 5.2 Operating environment 5.3 Storage environment 5.4 Transportation 5.5 Safety 5.6 Flammability Section 2 - Requirements for the case 6 Dimensional and mechanical character
15、istics of the case 5 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 General Overall dimensions Loading grip Holding areas Notches of the lid Lid dimensions Optical detection of the beginning and end of tape Bottom side 6.8.1 6.8.2 6.8.3 6.8.4 6.8.5 6.8.6 Locking mechanism of the slider Access holes Recognition, su
16、b-datum and write-inhibit holes Datum holes Access room for tape guides Holes for accessing the hubs 8 9 9 10 11 11 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 5 . . . 111 ISO/IEC 12248:1993 (E) 6.8.7 Internal structure of the lower half 6.8.8 Light path 6.8.9 Support areas 6.8.10 Datum areas
17、6.8.11 Relationship between support and datum areas and Reference Plane Z 6.9 Hubs 6.10 Leader and trailer attachment 6.11 Interface between the hubs and the drive spindles 6.12 Opening of the lid 6.13 Release of the hub locking mechanism 6.14 Label areas Section 3 - Requirements for the unrecorded
18、tape 7 7.1 7.2 7.2.1 7.2.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.10.1 7.10.2 7.11 7.12 7.13 8 8.1 8.2 8.3 8.4 8.4.1 8.4.2 8.5 8.6 8.6.1 8.6.2 8.7 Mechanical, physical and dimensional characteristics of the tape Materials Tape length Length of magnetic tape Length of leader and trailer tapes Tape width
19、Discontinuities Total thickness Longitudinal curvature Cupping Coating adhesion Layer-to-layer adhesion Tensile Strength Breaking Strength Yield Strength Residual elongation Electrical resistance of coated surfaces Light transmittance of tape Magnetic recording characteristics Optimum recording fiel
20、d Signal amplitude Resolution Overwrite Physical recording densities of 750.6 and 3 002 ftpmm Physical recording densities of 83,4 ftpmm and 1 001 ftpmm Ease of erasure Tape quality Missing pulses Missing pulse zone Signal-to-noise ratio (S/N) characteristic 11 12 13 13 13 13 14 14 14 14 15 26 26 26
21、 26 26 26 26 26 26 26 26 27 27 28 28 28 28 28 29 29 30 30 30 30 30 31 31 31 31 31 31 iv ISO/IEC 12248:1993 (E) Section 4 - Format 32 9 DATA/DAT-DC format 32 9.1 9.2 General Basic Groups Basic Groups for Group Format 0 Basic Groups for Group Format 1 32 32 9.2.1 9.2.2 32 34 9.3 Sub-groups 35 9.3.1 G
22、1 Sub-group 35 9.3.2 G2 Sub-group 36 9.3.3 G3 Sub-group 36 9.3.4 G4 Sub-group 37 9.3.5 Main Data Block 42 9.4 Sub-Data area 43 9.4.1 Pack Item No. 1 44 9.4.2 Pack Item No. 2 45 9.4.3 Pack Item No. 3 47 9.4.4 Pack Item No. 4 48 9.4.5 Pack Item No. 5 48 9.4.6 Pack Item No. 6 49 9.4.7 Pack Item No. 7 5
23、0 9.4.8 Sub Data Block 50 9.5 Basic Group structure 52 9.5.1 User Data 9.5.2 System Data 9.5.3 Record ID list 9.5.4 Heuristic Recovery Data Area 52 53 57 62 10 Method of recording 62 10.1 Physical recording density 62 10.2 Long-Term average bit cell length 62 10.3 Short-Term average bit cell length
24、62 10.4 Rate of change 62 10.5 Bit shift 62 10.6 Read signal amplitude 62 10.7 Maximum recorded levels 62 11 Track geometry 63 11.1 Track configuration 63 11.2 Average track pitch 63 11.3 Variations of the track pitch 63 11.4 Track width 64 11.5 Track angle 64 11.6 Track edge linearity 64 11.7 Track
25、 length 64 11.8 Ideal tape centreline 64 11.9 Azimuth angles 64 ISO/IEC 12248: 1993 (E) 12 Recording of blocks on the tape Recorded Main Data Block Recorded Sub Data Block Margin Blocks, Preamble Blocks and Postamble Blocks Spacer Blocks Format of a track 64 12.1 12.2 12.3 12.4 64 64 65 65 13 13.1 1
26、3.2 13.3 14 14.1 14.2 14.3 14.3.1 14.3.2 Track capacity Positioning accuracy Tracking scheme Group Formats Group Format 0 Group Format 1 Extended Gap Frames Extended Leading Gap Frames Extended Trailing Gap Frames Types of Groups Normal Groups Spare Groups Amble Groups Header Groups Magnetic tape la
27、yout Load/Unload Area Lead-in Area 65 65 65 65 68 68 68 69 69 69 14.4 69 14.4.1 14.4.2 14.4.3 14.4.4 70 70 70 70 15 71 15.1 15.2 71 72 15.2.1 Preamble 72 15.2.2 Header 72 15.2.3 Format Parameter Set 74 15.2.4 Master Reference 79 15.2.5 Postamble 84 15.3 Partition 85 15.3.1 Partition Preamble 85 15.3
28、.2 Partition Reference 85 15.3.3 Partition Postamble 96 15.3.4 Partition Data 96 15.3.5 End of Partition (EOP) 96 15.3.6 Unused Area 97 15.4 EOI 97 15.5 Repeated Groups 97 15.6 Repeated Frames within a Normal Group 97 15.7 Relocation of Defective Groups 98 15.8 Appending 98 15.8.1 Seamless appending
29、 98 15.8.2 Non-seamless appending 100 15.9 Overwrite 101 vi ISO/IEC 12248: 1993 (E) 15.9.1 Overlapped track width 15.9.2 Non-overlapped track width 15.9.3 Rules for overwrite Annexes A - Measurement of the light transmittance of the prisms B - Recognition boles C - Means for opening the lid D - Meas
30、urement of light transmittance of tape and leaders E - Measurement of Signal-to-Noise Ratio F - Method for determining the nominal and the maximum allowable recorded levels C - Representation of g-bit bytes by IO-bit pattern H - Measurement of bit shift J - Recommendations for transportation K - Met
31、hod of measuring track edge linearity L - Read-After-Write M - Data allocation and C3 parity 102 102 102 103 105 106 107 110 111 112 118 121 122 123 124 vii ISOAEC 12248: 1993 (E) Foreword IS0 (the International Organization for Standardization) and IEC (the Inter- national Electrotechnical Commissi
32、on) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees estab- lished by the respective organization to deal with particular fields of technical activity. IS0
33、and IEC technical committees collaborate in fields of mutual inter- est. Other international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, IS
34、O/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publi- cation as an International Standard requires approval by at least 75 % of the na- tional bodies casting a vote. International Standard ISO/IEC 12248 was prepared b
35、y the European Computer Manufacturers Association (ECMA) (as Standard ECMA-171) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Znfomtation technology, in parallel with its approval by national bodies of IS0 and IEC. Annexes A, D, E, F, G, H, K an
36、d M form an integral part of this International Standard. Annexes B, C, J and L are for information only. . . . VII1 ISO/IEC 12248:1993 (E) Introduction ISO/lEC have produced a series of International Standards for cassettes and cartridges containing magnetic tapes of different width and characteris
37、tics. Of these, the following relate to helical scan recording. ISO/IEC 10777:1991, 3,81 mm wide magnetic tape cartridge foR information interchange - Helical scan recording - DDS format ISO/IEC 113 19: 1993, 8 mm wide magnetic tape cartridge for information interchange - Helical scan recording ISO/
38、IEC 11321:1992, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan Recording - DATAIDAT format ISO/IEC 11557: 1992, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS-DC format using 60 m and 90 m length tapes, 2nd edition ISO
39、/IEC 12246:1993, 8 mm wide magnetic tape cartridge, dual azimuth format for information interchange - Helical scan recording ISO/IEC 12247: 1993, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DDS format using 60 m and 90 m length tapes ix INTERNATIONAL S
40、TANDARD ISO/IEC 12248:1993 (E) Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DATA/DAT-DC format using 60 m and 90 m length tapes Section 1 - General 1 Scope This International Standard specifies the physical and magnetic characte
41、ristics of a 3,81 mm wide magnetic tape cartridge to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, the recorded format and the recording method, thereby allowing data interchange between drives by means of such magnetic tape cartridges. The form
42、at used is known as DATA/DAT-DC. This International Standard specifies two types of cartridges which, for the purpose of this International Standard, are referred to as Type A and Type B. For Type A, the magnetic tape has a nominal thickness of 13 pm and a nominal length of up to 605 m. For Type B,
43、the magnetic tape has a nominal thickness of 9 pm a length of up to 92.0 m. Information interchange between systems by means of this International Standard also requires the use, at a minimum, of a labelling and file structure and an interchange code which are agreed upon by the interchange parties.
44、 It is not within the scope of this International Standard to specify the labelling and file structure, or the interchange code. 2 Conformance 2.1 Magnetic tape cartridge A tape cartridge shall be in conformance with this International Standard if it meets all mandatory requirements specified herein
45、 for either Type A or Type B. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating system A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance to this International Standard if all recordings on the tape meet the m
46、andatory requirements of this International Standard. A claim of conformance shall state whether cartridges of Type A or Type B or both are supported. 2.3 Receiving system A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Stan
47、dard if it is able to handle any recording made on the tape according to this International Standard. A claim of conformance shall state whether cartridges of Type A or Type B or both are supported. 3 Normative references The following standards contain provisions which, through reference in this te
48、xt, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edi
49、tions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. ISO/R 527: 1966, Plastics - Determination of tensile pr0pertie.s ISO/IEC 646: 199 1, Information technology - IS0 7-bit coded character set for information interchange. IS0 1302: 1992, Technical drawings - Method of indicating surface texture. 1 ISO/IEC 12248: 1993 (E) ISO/IEC 11576: 1993, Information technology - Procedure for the registration of algorithms for the lossless compression of data. IEC 950: 1991, Safety of information technology equipment, including electr
