1、INTERNATIONAL STANDARD ISO/IEC 13962 First edition 1995-09-l 5 Information technology - Data interchange on 12,7 mm, 112track magnetic tape cartridges - DLT 2 format Technologies de /information - ichange de donndes sur car-touches de bande magnhique de 12,7 mm, 7 12 pistes - Format DLT 2 Reference
2、number ISO/IEC 13962:1995(E) ISO/IEC 13962:1995 (E) Contents 1 Scope 2 Conformance 2.1 Magnetic tape cartridges 2.2 Generating systems 2.3 Receiving systems 3 Normative references 4 Definitions 4.1 Average Signal Amplitude 4.2 azimuth 4.3 back surface 4.4 Beginning-Of-Tape marker (BOT) 4.5 byte 4.6
3、cartridge 4.7 Cyclic Redundancy Check (CRC) character 4.8 Early Warning (EW) 4.9 Error-Detecting Code (EDC) 4.10 End-Of-Tape marker (EOT) 4.11 Entity 4.12 Error-Correcting Code (ECC) 4.13 flux transition position 4.14 flux transition spacing 4.15 Logical Block 4.16 logical track 4.17 magnetic tape 4
4、.18 Master Standard Reference Tape 4.19 object 4.20 physical block 4.21 physical recording density 4.22 physical track 4.23 Record 4.24 Reference Edge 4.25 Reference Field 4.26 Secondary Standard Reference Tape Page 1 1 1 1 1 1 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 ISOllEC 1995 All r
5、ights 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 permission in writing from the publisher ISOllEC Copyright Office - Case Postale 56 . CH-1211 Gene
6、ve 20 . Switzerland Printed in Switzerland ii OISO/IEC ISO/IEC 13692:1995 (E) 4.27 Standard Reference Amplitude (SRA) 4.28 Standard Reference Current 4.29 Test Recording Current 4.30 Typical Field 5 Conventions and notations 5.1 Representation of numbers 5.2 Names 5.3 Acronyms 6 Environment and safe
7、ty 6.1 Cartridge and tape testing environment 6.2 Cartridge operating environment 6.3 Cartridge storage environment 6.4 Safety 6.4.1 Safeness 6.4.2 Flammability 6.5 Transportation Section 2 - Requirements for the unrecorded tape 7 Mechanical and electrical requirements 7.1 Material 7.2 Tape length 7
8、.3 Width 7.4 Total thickness 7.5 Thickness of the base material 7.6 Thickness of the magnetic coating 7.7 Thickness of the back coating 7.8 Discontinuity 7.9 Longitudinal curvature 7.9.1 Requirement 7.9.2 Procedure 7.10 Out-of-Plane distortions 7.11 Cupping 7.12 Roughness of the coating surfaces 7.1
9、2.1 Roughness of the back coating surface 7.12.2 Roughness of the magnetic coating surface 7.13 Coating adhesion 7.14 Layer-to-layer adhesion 7.14.1 Requirements 7.14.2 Procedure 7.15 Modulus of elasticity 7.15.1 Requirement 7.15.2 Procedure 7.16 Flexural rigidity 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5
10、 5 5 5 5 5 5 5 5 5 5 5 5 5 6 6 6 6 7 7 7 8 8 8 8 . . . 111 ISO/-IEC 13962:1995 (E) OISO/IEC 7.16.1 Requirement 7.16.2 Procedure 7.17 Tensile yield force 7.17.1 Procedure 7.18 Electrical resistance 7.18.1 Requirement 7.18.2 Procedure 7.19 Inhibitor tape 7.20 Abrasivity 7.20.1 Requirement 7.20.2 Proce
11、dure 7.21 Light transmittance of the tape and the leader 7.22 Coefficient of dynamic friction 7.22.1 Requirements 7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 7.22.3 Procedure for the measurement of the friction between the magnetic surface o
12、r the back surface and calcium titanate ceramic 8 Magnetic recording characteristics 8.1 Typical Field 8.2 Signal amplitude 8.3 Resolution 8.4 Overwrite 8.4.1 Requirement 8.5 Peak shift 8.5.1 Requirement 8.5.2 Procedure 9 Tape quality 9.1 Missing pulses 9.1.1 Requirement 9.2 Missing pulse zone 9.2.1
13、 Requirement 9.3 Tape durability Section 3 - Mechanical specifications of the tape cartridge 10 General 10.1 Bottom side and right side 10.2 Back side and left side 10.3 Tape reel 10.4 Tape leader 10.5 Front side 10.6 Operation of the cartridge 10.7 Tape winding 8 8 9 9 9 9 9 10 10 10 10 10 10 10 11
14、 11 11 11 12 12 12 12 12 12 12 13 13 13 13 13 13 14 14 14 15 16 16 18 18 19 iv OISO/IEC ISO/IEC 13692:1995 (E) 10.8 Moment of inertia 10.9 Material Section 4 - Requirements for an interchanged tape 11 Method of recording 11.1 Physical recording density 11.2 Bit cell length 11.2.1 Average bit cell le
15、ngth 11.2.2 Long-term average bit cell length 11.2.3 Short-term average bit cell length 19 19 28 28 28 28 28 28 28 11.3 Flux transition spacing 28 11.4 Read signal amplitude 28 11.5 Azimuth 28 11.6 Channel skew 28 12 Tape format 29 12.1 Reference Edge 29 12.2 Direction of recording 29 12.3 Tape layo
16、ut 29 12.4 Calibration and Directory Area 29 12.4.1 Scratch Area 12.4.2 Guard Area Gl 12.4.3 Calibration Tracks Area 12.4.4 Guard Area G2 12.4.5 Directory Area 12.4.6 Guard Area G3 30 30 30 31 31 31 12.5 Data Area 31 12.5.1 Physical tracks 12.5.2 Width of the physical tracks 12.5.3 Logical tracks 12
17、.5.4 Locations of the physical tracks 12.5.5 Layout of tracks in the Data Area 32 32 32 32 35 13 Data format 36 13.1 Data Bytes 13.2 Logical Blocks 13.3 Data Blocks 13.4 Types of Logical Blocks 13.5 Entities 13.6 Logical Block format 36 36 36 36 37 37 13.6.1 Preamble 37 13.6.2 Sync 37 13.6.3 Data Fi
18、eld 37 13.6.4 Control Field 1 (CFI) 38 13.6.5 Control Field 2 (CF2) 40 13.6.6 CRC 41 13.6.7 Postamble 41 V ISO/IEC 13962: 1995 (E) 14 Use of Logical Blocks 14.1 Data Blocks 14.2 Tape Mark Blocks 14.3 Filler Blocks 14.4 End of Track Blocks (EOTR) 14.5 End of Data Blocks (EOD) 14.6 ECC Blocks 15 Forma
19、t of Entities 16 Error handling Annexes A - Measurement of light transmittance B - CRC generation C - ECC generation D - Format of Control Field 1 E - Format of Control Field 2 F - Recommendations for transportation G - Inhibitor tape H - Recommendations on tape durability J - Handling guidelines OI
20、SO/IEC 41 41 41 41 41 41 41 42 42 43 43 46 47 50 51 52 53 54 55 vi OISO/IEC ISO/IEC 13692:1995 (E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that
21、 are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other internat
22、ional 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, ISOAEC JTC 1. Draft International Standards adopted by the joint technical committee are
23、circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 13962 was prepared by ECMA (as Standard ECMA-197) and was adopted, under a special “fast-track procedure”, by Jo
24、int Technical Committee ISOLIEC JTC 1, Informdon technology. Annexes A to E form an integral part of this International Standard. Annexes F to J are for information only. vii ISOAEC 13962:1995 (E) OISO/IEC Introduction ISO/IEC 13421) specifies a magnetic tape cartridge in which the 12,7 mm wide magn
25、etic tape is recorded on 48 parallel physical tracks, recorded and read in pairs, which constitute two groups, the first recorded and read in forward direction, the second in reverse direction. This International Standard constitutes a further development of the cartridge specified in ISO/IEC 13421
26、in that the number of tracks has been raised from 48 to 112, thus raising the total capacity of the cartridge accordingly. Drives for cartridges according to this International Standard may be able to read from, and write onto, cartridges according to ISO/IEC 13421. l) ISO/IEC 13421: 1993, Informati
27、on technology - Data interchange on 12,7 mm, 48-track magnetic tape cartridges - DLTI fo?nat. . . . Vlll INTERNATIONAL STANDARD ISO/IEC ISO/IEC 13962:1995 (E) Information technology - Data interchange on 12,7 mm, 112track magnetic tape cartridges - DLT 2 format Section 1 - General 1 Scope This Inter
28、national Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 112-track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format - called Digital Linear Tape 2 LT 2) - and a recording method.
29、Together with a labelling standard, e.g. IS0 1001, it allows full data interchange by means of such magnetic tape cartridges. 2 Conformance 2.1 Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of th
30、is International Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating systems A system 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
31、 tape according to 2.1 meet the mandatory requirements of this International Standard. 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Standard if it is able to handle any recording made on a tape accor
32、ding to 2.1. 3 Normative references The following standards contain provisions which, through reference in this text, 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
33、based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1001: 1986, information processing - File structure and lab
34、elling of magnetic tapes for information interchange. IS0 1302:1992, Technical drawings - Method of indicating surface texture. 4 Definitions For the purpose of this International Standard, the following definitions apply. 4.1 Average Signal Amplitude: The average peak-to-peak value of the output si
35、gnal from the read head at the physical recording density of 1 674 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses. 4.2 azimuth: The angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track from the line normal to t
36、he Reference Edge. 4.3 back surface: The surface of the tape opposite the magnetic coating which is used to record data. 4.4 Beginning-Of-Tape marker (BOT): A hole punched on the centreline of the tape towards the end nearest to the leader. 4.5 byte: An ordered set of bits acted upon as a unit. Note
37、 1 - In this International Standard, all bytes are g-bit bytes. ISOAEC 13962:1995 (E) OISO/IEC 4.6 cartridge: A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer end. 4.7 Cyclic Redundancy Check (CRC) character: A 64-bit character, generated by a
38、mathematical computation, used for error detection. 4.8 Early Warning (EW): A signal generated by the drive indicating the approaching end of the recording area. 4.9 Error-Detecting Code (EDC): A mathematical computation yielding check bytes used for error detection. 4.10 End-Of-Tape marker (EOT): A
39、 hole punched on the centreline of the tape towards the end farthest from the leader. 4.11 Entity: A group of ten Logical Blocks treated as a logical unit and recorded on a logical track. 4.12 Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction of err
40、ors detected by the CRC and the EDC. 4.13 flux transition position: The point which 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, 4.15 Logical Block: The two physical block
41、s simultaneously written on, or read from, the two physical tracks of a logical track. 4.16 logical track: A pair of physical tracks that are written or read simultaneously. 4.17 magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on compu
42、ters and associated equipment. 4.18 Master Standard Reference Tape: A tape selected as the standard for reference field, signal amplitude, resolution, peakshift, and overwrite characteristics. Note 2 - The Master Standard Reference Tape is maintained by the Quantum Corporation. 4.19 object: A Record
43、 or a Tape Mark Block. 4.20 physical block: A set of contiguous bytes recorded on a physical track and considered as a unit. 4.21 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). 4.22 physical track: A
44、 longitudinal area on the tape along which a series of magnetic signals can be recorded. 4.23 Record: A collection of User Bytes, the number of which is determined by the host. 4.24 Reference Edge: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the left and
45、 the EOT to the right of the observer. 4.25 Reference Field: The Typical Field of the Master Standard Reference Tape. 4.26 Secondary Standard Reference Tape: A tape the characteristics of which are known and stated in relation to those of the Master Standard Reference Tape. Note 3 - Secondary Standa
46、rd Reference Tapes can be ordered under Reference “SSRT/DLTl” until the year 2003 from Quantum Corporation, 334 South Street, Shrewsbury, Mass. 01545, USA. It is intended that these be used for calibrating tertiary reference tapes for routine calibration. 4.27 Standard Reference Amplitude (SRA): The
47、 Average Signal Amplitude from the Master Standard Reference Tape when it is recorded with the Test Recording Current at 1 674 ftpmm. 4.28 Standard Reference Current: The current that produces the Reference Field. 2 OISO/IEC ISO/IEC 13962:1995 (E) 4.29 Test Recording Current: The current that is 1,l
48、 times the Standard Reference Current. 4.30 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the physical recording density of 1674 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. 5 Conve
49、ntions and notations 5.1 Representation of numbers The following conventions and notations apply in this International Standard, unless otherwise stated. - In each block and in each field the bytes shall be arranged with Byte 1, the least significant, first. Within each byte the bits shall be arranged with Bit 1, the least significant, first and Bit 8, the most significant bit, last. This order applies to the data, and to the input and output of the error-detecting and error-correcting codes, and to the cyclic redundancy characters. - Letters an
