1、 Reference numberISO/IEC 22051:2002(E)ISO/IEC 2002INTERNATIONAL STANDARD ISO/IEC22051First edition2002-10-01Information technology Data interchange on 12,7 mm, 448-track magnetic tape cartridges SDLT1 format Technologies de linformation change de donnes sur cartouche bande magntique 12,7 mm, 448 pis
2、tes Format SDLT1 Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date of ANSI Approval: 7/7/2003Published by American National Standards Institute,25 West 43rd Street, New York, New York 10036Copyright 2003 by Information Technology I
3、ndustry 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), and Information Technology Industry Council(ITI). Not for resal
4、e. 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,Washington, DC 20005.Printed in the United States of AmericaISO/
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9、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 2002 All rights reservedISO/IEC 22051:2002(E) ISO/IEC 2002 All rights reserved iiiC
10、ontents 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridges 1 2.2 Generating systems 1 2.3 Receiving systems 1 3 Normative references 1 4 Terms and definitions 1 4.1 back surface 1 4.2 Beginning-Of-Tape marker (BOT) 1 4.3 block 2 4.4 byte 2 4.5 cartridge 2 4.6 Cyclic Redundancy Check (CRC) charac
11、ter 2 4.7 Error-Detecting Code (EDC) 2 4.8 End-Of-Tape marker (EOT) 2 4.9 Entity 2 4.10 Error-Correcting Code (ECC) 2 4.11 Envelope 2 4.12 Envelope size 2 4.13 flux transition position 2 4.14 flux transition spacing 2 4.15 logical track 2 4.16 magnetic tape 2 4.17 Master Standard Reference Tape 2 4.
12、18 object 2 4.19 page 2 4.20 recording density 2 4.21 physical track 2 4.22 Record 3 4.23 Reference Edge 3 4.24 Reference Field 3 4.25 Secondary Standard Reference Tape 3 4.26 Standard Reference Amplitude (SRA) 3 4.27 Standard Reference Current 3 4.28 Test Recording Current 3 4.29 Typical Field 3 5
13、Conventions and notations 3 5.1 Representation of numbers 3 5.2 Dimensions 3 5.3 Names 3 5.4 Acronyms 3 6 Environment and safety 4 6.1 Cartridge and tape testing environment 4 6.2 Cartridge operating environment 4 6.3 Cartridge storage environment 4 6.4 Safety 4 6.5 Flammability 4 6.6 Transportation
14、 4 ISO/IEC 22051:2002(E) iv ISO/IEC 2002 All rights reservedSection 2 - Requirements for the unrecorded tape 5 7 Mechanical and electrical requirements 5 7.1 Material 5 7.2 Tape length 5 7.3 Tape width 5 7.4 Tape thickness 5 7.5 Discontinuity 5 7.6 Longitudinal curvature 5 7.6.1 Requirements 5 7.6.2
15、 Procedure 5 7.7 Out-of-Plane distortions 5 7.8 Cupping 5 7.9 Roughness of the coating surfaces 6 7.9.1 Roughness of the back coating surface 6 7.9.2 Roughness of the magnetic coating surface 7.10 Coating adhesion 6 7.11 Layer-to-layer adhesion 6 7.11.1 Requirements 6 7.11.2 Procedure 6 7.12 Modulus
16、 of elasticity 7 7.12.1 Requirement 7 7.12.2 Procedure 7 7.13 Flexural rigidity 8 7.13.1 Requirement 8 7.13.2 Procedure 8 7.14 Tensile yield force 8 7.14.1 Procedure 8 7.15 Electrical resistance 8 7.15.1 Requirement 8 7.15.2 Procedure 8 7.16 Inhibitor tape 9 7.17 Light transmittance of the tape and
17、the leader 9 7.18 Abrasivity 9 7.19 Coefficient of dynamic friction 9 7.19.1 Requirements 9 7.19.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 9 7.19.3 Procedure for the measurement of the friction between the magnetic surface or the back surface a
18、nd calcium titanate ceramic 10 7.20 Servo 10 7.20.1 Servo Bands 10 7.20.2 Servo Tracks 11 7.20.3 Signal 11 7.20.4 Signal-to Noise Ratio 11 7.20.5 Missing servo mark 11 8 Magnetic recording characteristics 12 ISO/IEC 22051:2002(E) ISO/IEC 2002 All rights reserved v8.1 Typical Field 13 8.2 Signal ampl
19、itude 13 8.3 Resolution 13 8.4 Overwrite 13 8.4.1 Requirement 13 9 Tape quality 13 9.1 Missing pulses 13 9.1.1 Requirement 13 9.2 Missing pulse zone 13 9.2.1 Requirement 13 9.3 Tape durability 13 Section 3 - Mechanical specifications of the tape cartridge 14 10 General 14 10.1 Bottom side and right
20、side 14 10.2 Back side and left side 15 10.3 Tape reel 16 10.4 Tape leader 17 10.5 Front side 18 10.6 Operation of the cartridge 18 10.7 Tape winding 19 10.8 Moment of inertia 19 10.9 Material 19 Section 4 - Requirements for an interchanged tape 29 11 Tape format 29 11.1 Reference Edge 29 11.2 Direc
21、tion of recording 29 11.3 Tape layout 29 11.3.1 Data Area 29 11.3.2 Forward Alignment and Directory Area 31 11.3.3 Reverse Alignment Area at EOT 32 12 Data format 33 12.1 Record 33 12.2 Data Bytes 33 12.3 Data Field 33 12.3.1 Pages 34 12.3.2 Pad Bytes 34 12.3.3 Page layout 34 12.3.4 MAP entries 34 1
22、2.3.5 EDC 35 12.4 Data Blocks 35 12.4.1 Control Field 1 (CF1) 36 12.4.2 Control Field 2 (CF2) 37 12.4.3 CRC 39 13 Method of recording 39 13.1 Physical recording density 40 13.2 Channel bit cell length 40 ISO/IEC 22051:2002(E) vi ISO/IEC 2002 All rights reserved13.2.1 Average Channel bit cell length
23、40 13.2.2 Long-term average Channel bit cell length 40 13.2.3 Short-term average Channel bit cell length 13.3 Read signal amplitude 40 13.4 Channel skew 40 14 Block Recording Format 41 14.1 Scrambler 41 14.2 Modulation 41 14.2.1 Modulation process 41 14.2.2 Modulated Data Group 42 14.3 Precoder 42 1
24、4.4 Recording Data Block 43 14.4.1 Preamble 43 14.4.2 Sync 43 15 Types and Use of Blocks 43 15.1 Types of Blocks 43 15.2 Use of blocks 43 15.2.1 Track ID Start Blocks 43 15.2.2 End of Track Blocks (EOTR) 44 15.2.3 End of Data of Data Blocks (EOD) 44 15.2.4 ECC Blocks 44 15.2.5 Track ID End Blocks 44
25、 16 Format of Entities 44 17 Format of Envelopes 44 18 Error handling 44 Annexes A - Measurement of light transmittance 45 B - Procedure for the measurement of abrasivity 48 C - Generation of the Data Block CRCs 50 D - Generation of page CRCs 51 E - ECC generation 52 F - Allocation of Physical Track
26、s to Logical Tracks 55 G - Recommendations for transportation 56 H - Inhibitor tape 57 J - Recommendations on tape durability 58 K - Handling guidelines 59 ISO/IEC 22051:2002(E) ISO/IEC 2002 All rights reserved viiForeword ISO (the International Organization for Standardization) and IEC (the Interna
27、tional 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 organization to deal with particular fiel
28、ds 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. In the field of information technology, ISO and IEC have established a j
29、oint 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 Standards. Draft International Standards adopted by the joint technical commit
30、tee 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 elements of this International Standard may be the subject of patent rights. ISO
31、 and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 22051 was prepared by ECMA (as ECMA-320) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by nationa
32、l bodies of ISO and IEC. Annexes A to F form a normative part of this International Standard. Annexes G to K are for information only. INTERNATIONAL STANDARD ISO/IEC 22051:2002(E) ISO/IEC 2002 All rights reserved 1Information technology Data interchange on 12,7 mm, 448-track magnetic tape cartridges
33、 SDLT1 format Section 1 - General 1 Scope This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 448-track magnetic tape cartridge, to enable physical interchangeability of such cartridges between drives. It also specifies the quality of the recorded signa
34、ls, a format - called Super Digital Linear Tape 1 (SDLT 1) - and a recording method, thereby allowing data interchange between drives. Together with a labelling standard, for instance ISO 1001 for Magnetic Tape Labelling, it allows full data interchange by means of such magnetic tape cartridges. 2 C
35、onformance 2.1 Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of this International Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating systems A s
36、ystem generating a magnetic tape cartridge for interchange shall be in conformance with this International Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International Standard. In addition, a claim of conformance shall state whether o
37、r not one, or more registered algorithm(s) are implemented within the system, the registered identification number(s) of the implemented compression algorithm(s). 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be in conformance with this International Standa
38、rd if it is able to handle any recording made on a tape according to 2.1. In addition, a claim of conformance shall state whether or not one, or more de-compression algorithm(s) are implemented within the system, and are able to be applied to de-compress data prior to making such data available to t
39、he host, the registered identification number(s) of the implemented compression algorithm(s). 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 amen
40、dments to, or revisions of, any of these publications do not apply. 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 ed
41、ition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1001:1986, Information processing File structure and labelling of magnetic tapes for information interchange ISO 1302:2002, Geometrical Product Specification
42、s (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 4 Terms and definitions For the purpose of this International Standard, the following terms and defini
43、tions apply. 4.1 back surface The surface of the tape opposite the magnetic coating which is used to record data. 4.2 Beginning-Of-Tape marker (BOT) A hole punched on the centreline of the tape towards the end nearest to the leader. ISO/IEC 22051:2002(E) 2 ISO/IEC 2002 All rights reserved4.3 block A
44、 set of contiguous bytes recorded on a physical track and considered as a unit. 4.4 byte An ordered set of bits acted upon as a unit. NOTE - In this International Standard, all bytes are 8-bit bytes. 4.5 cartridge A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader att
45、ached at the outer end. 4.6 Cyclic Redundancy Check (CRC) character A 64-bit character, generated by a mathematical computation, used for error detection. 4.7 Error-Detecting Code (EDC) A mathematical computation yielding check bytes used for error detection. 4.8 End-Of-Tape marker (EOT) A hole punc
46、hed on the centreline of the tape towards the end farthest from the leader. 4.9 Entity A group of twenty blocks treated as a logical unit. 4.10 Error-Correcting Code (ECC) A mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC. 4.11 Envelope
47、 A group of Entities. 4.12 Envelope size The number of Entities in an Envelope. 4.13 flux transition position The point that exhibits the maximum free-space flux density normal to the tape surface. 4.14 flux transition spacing The distance on the magnetic tape between successive flux transitions. 4.
48、15 logical track A group of eight physical tracks that are written or read simultaneously. 4.16 magnetic tape A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on computers and associated equipment. 4.17 Master Standard Reference Tape A tape selected a
49、s the standard for Reference Field, signal amplitude, resolution, and overwrite characteristics. NOTE - The Master Standard Reference Tape has been established by the Quantum Corporation. 4.18 object A Record or a page of type Tape Mark. 4.19 page A logical division of a block. 4.20 recording density The number of recorded flux transitions per unit length of track. 4.21 physical track A longitudinal area on the tape along which a series of magnetic signals can be recorded. ISO/IEC 22051:2002(E) ISO/IEC 2002 All rights
