《ISO-15895-1999.pdf》由会员分享，可在线阅读，更多相关《ISO-15895-1999.pdf（62页珍藏版）》请在三一文库上搜索。
1、Reference number ISO/IEC 15895:1999(E) ISO/IEC 1999 INTERNATIONAL STANDARD ISO/IEC 15895 First edition 1999-12-15 Information technology Data interchange on 12,7 mm 128-track magnetic tape cartridges DLT 3-XT format Technologies de linformation change de donnes sur cartouches de bande magntique de12
2、,7 mm, 128 pistes Format DLT 3-XT ISO/IEC 15895:1999(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 which are embedded are licensed to and installed on the com
3、puter performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to cre
4、ate this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform th
5、e Central Secretariat at the address given below. ISO/IEC 1999 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 permission in writing from ei
6、ther 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 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO/IEC 1999 All rights reserved ISO/IEC iii Conten
7、ts Section 1 - General1 1 Scope1 2 Conformance1 2.1 Magnetic tape cartridges1 2.2 Generating systems1 2.3 Receiving systems1 3 Normative references1 4 Definitions2 4.1 Average Signal Amplitude2 4.2 azimuth2 4.3 back surface2 4.4 Beginning-Of-Tape markers (BOT 1 and BOT 2)2 4.5 byte2 4.6 cartridge2 4
8、.7 Cyclic Redundancy Check (CRC) character2 4.8 Early Warning (EW)2 4.9 Error-Detecting Code (EDC)2 4.10 End-Of-Tape marker (EOT)2 4.11 Entity2 4.12 Error-Correcting Code (ECC)2 4.13 flux transition position2 4.14 flux transition spacing2 4.15 Logical Block2 4.16 logical track2 4.17 magnetic tape2 4
9、.18 Master Standard Reference Tape2 4.19 object2 4.20 page2 4.21 physical block2 4.22 physical recording density2 4.23 physical track2 4.24 Record2 4.25 Reference Edge2 4.26 Reference Field2 4.27 Secondary Standard Reference Tape2 4.28 Standard Reference Amplitude (SRA)3 4.29 Standard Reference Curr
10、ent3 ISO/IEC 15895:1999 (E) ISO/IEC ISO/IEC 15895:1999 (E) iv 4.30 Test Recording Current3 4.31 Typical Field3 5 Conventions and notations3 5.1 Representation of numbers3 5.2 Dimensions3 5.3 Names3 5.4 Acronyms3 6 Environment and safety3 6.1 Cartridge and tape testing environment4 6.2 Cartridge oper
11、ating environment4 6.3 Cartridge storage environment4 6.4 Safety4 6.4.1 Safeness4 6.4.2 Flammability4 6.5 Transportation4 Section 2 - Requirements for the unrecorded tape5 7 Mechanical and electrical requirements5 7.1 Material5 7.2 Tape length5 7.3 Width5 7.4 Total thickness5 7.5 Discontinuity5 7.6
12、Longitudinal curvature5 7.6.1 Requirement5 7.6.2 Procedure5 7.7 Out-of-Plane distortions5 7.8 Cupping5 7.9 Roughness of the coating surfaces5 7.9.1 Roughness of the back coating surface5 7.9.2 Roughness of the magnetic coating surface5 7.10 Coating adhesion6 7.11 Layer-to-layer adhesion6 7.11.1 Requ
13、irements6 7.11.2 Procedure6 7.12 Modulus of elasticity7 7.12.1 Requirement7 7.12.2 Procedure7 7.13 Flexural rigidity7 7.13.1 Requirement7 7.13.2 Procedure8 7.14 Tensile yield force8 7.14.1 Procedure8 7.15 Electrical resistance8 7.16.1 Requirement8 7.15.2 Procedure8 7.16 Inhibitor tape9 7.17 Abrasivi
14、ty9 7.17.1 Requirement9 7.17.2 Procedure9 7.18 Light transmittance of the tape and the leader9 7.19 Coefficient of dynamic friction9 7.19.1 Requirements9 7.19.2 Procedure for the measurement of the friction between the magnetic surface and the back surface10 v 7.19.3 Procedure for the measurement of
15、 the friction between the magnetic surface or the back surface and calcium titanate ceramic10 8 Magnetic recording characteristics10 8.1 Typical Field11 8.2 Signal amplitude11 8.3 Resolution11 8.4 Overwrite11 8.4.1 Requirement11 8.5 Peak shift11 8.5.1 Requirement11 8.5.2 Procedure11 9 Tape quality12
16、 9.1 Missing pulses12 9.1.1 Requirement12 9.2 Missing pulse zone12 9.2.1 Requirement12 9.3 Tape durability12 Section 3 - Mechanical specifications of the tape cartridge12 10 General12 10.1 Bottom side and right side13 10.2 Back side and left side14 10.3 Tape reel14 10.4 Tape leader and markers15 10.
17、5 Front side16 10.6 Operation of the cartridge16 10.7 Tape winding17 10.8 Moment of inertia17 10.9 Material17 11 Method of recording26 11.1 Physical recording density26 11.2 Channel bit cell length26 11.2.1 Average Channel bit cell length26 11.2.2 Long-term average Channel bit cell length26 11.2.3 S
18、hort-term average Channel bit cell length26 11.3 Flux transition spacing26 11.4 Read signal amplitude26 11.5 Azimuth27 11.6 Channel skew27 12 Tape format27 12.1 Reference Edge27 12.2 Direction of recording27 12.3 Tape layout27 12.4 Calibration and Directory Area27 12.4.1 Scratch Area28 12.4.2 Guard
19、Area G128 12.4.3 Calibration Tracks Area28 12.4.4 Guard Area G229 12.4.5 Directory Area29 12.4.6 Guard Area G329 12.5 Data Area29 12.5.1 Physical tracks30 12.5.2 Width of the physical tracks30 ISO/IEC 15895:1999 (E)ISO/IEC vi 12.5.3 Logical tracks30 12.5.4 Locations of the physical tracks30 12.5.5 L
20、ayout of tracks in the Data Area31 13 Data format31 13.1 Data Bytes32 13.2 Logical Blocks32 13.3 Data Blocks32 13.4 Types of Logical Blocks32 13.5 Entities32 13.6 Logical Block format32 13.6.1 Preamble33 13.6.2 Sync33 13.6.3 Data Field33 13.6.4 EDC35 13.6.5 Control Field 1 (CF1)35 13.6.6 Control Fie
21、ld 2 (CF2)36 13.6.7 CRC37 13.6.8 Postamble37 14 Use of Logical Blocks37 14.1 Data Blocks37 14.2 Filler Blocks37 14.3 End of Track Blocks (EOTR)38 14.4 End of Data Blocks (EOD)38 14.5 ECC Blocks38 15 Format of Entities38 16 Error handling38 Annexes A - Measurement of light transmittance39 B - Generat
22、ion of the Data Block CRCs42 C - ECC generation43 D - Generation of page CRCs46 E - Format of MAP entries47 F - Format of Control Field 148 G - Format of Control Field 249 H - Recommendations for transportation50 J - Inhibitor tape51 K - Recommendations on tape durability52 L - Handling guidelines53
23、 ISO/IEC ISO/IEC 15895:1999 (E) ISO/IEC 15895:1999 (E)ISO/IEC vii Foreword ISO (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 partic
24、ipate in the development of International Standards through technical committees 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
25、 and non-governmental, in liaison with ISO and IEC, also take part in the work. International Standards are drafted 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. D
26、raft 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 elements of th
27、is 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. International Standard ISO/IEC 15895 was prepared byECMA European association for standardizing information and communication systems(as ECMA-258) a
28、nd was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1,Information technology, in parallel with its approval by national bodies of ISO and IEC. Annexes A to G form a normative part of this International Standard. Annexes H to L are for information only. vi
29、ii Introduction This International Standard constitutes a further development of the magnetic tape cartridge specified in International Standard ISO/IEC 14833. A higher capacity is achieved by using a thinner, thus longer tape. ISO/IEC ISO/IEC 15895:1999 (E) INTERNATIONAL STANDARD ISO/IEC ISO/IEC 15
30、895:1999(E) Section 1 - General 1Scope This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 128-track magnetic tape cartridge, to enable physical interchangeability of such cartridges between drives. It also specifies the quality of the recorded signals,
31、 a format - called Digital Linear Tape 3 Extended (DLT 3-XT) - and a recording method, thereby allowing data interchange between drives. Together with a labelling standard, for instance International Standard ISO 1001 for Magnetic Tape Labelling, it allows full data interchange by means of such magn
32、etic tape cartridges. 2Conformance 2.1Magnetic 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
33、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 tape according to 2.1 meet the mandatory requirements of this International Standard. In addition a claim
34、of conformance shall state whether or not one, or more registered algorithm(s) are implemented within the system, and are able to compress data received from the host prior to collecting data into blocks, and the registered identification number(s) of the implemented algorithm(s) 2.3Receiving system
35、s 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 according to 2.1. In addition a claim of conformance shall state whether or not one, or more de-compression algo
36、rithm(s) are implemented witin the system, and are able to be applied to de-compress data prior to making such data available to the host, and the registered identification number(s) of the implemented algorithm(s) 3Normative references The following standards contain provisions which, through refer
37、ence 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 agreem ents based on this International Standard are encouraged to investigate the possibility of applying the
38、 most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1001:1986Information processing - File structure and labelling of magnetic tapes for information interchange. ISO 1302:1992Technical drawings - Method of
39、indicating surface texture. ISO/IEC 11576:1994Information technology - Procedure for the registration of algorithms for the lossless compression of data. 1 Information technology - Data interchange on 12,7 mm 128-track magnetic tape cartridges - DLT 3-XT format ISO/IEC 15895:1999 (E)ISO/IEC 2 4Defin
40、itions For the purposes of this International Standard, the following definitions apply. 4.1Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the physical recording density of 1 640 ftpmm measured over a minimum length of track of 25,4 mm, exclusive
41、of missing pulses. 4.2azimuth: The angular deviation, in degrees of arc, of the mean flux transition line of the recording made on a track from the line normal to the Reference Edge. 4.3back surface: The surface of the tape opposite the magnetic coating which is used to record data. 4.4Beginning-Of-
42、Tape markers (BOT 1 and BOT 2): Two holes punched on the centreline of the tape towards the end nearest to the leader. 4.5byte: An ordered set of bits acted upon as a unit. Note - In this International Standard, all bytes are 8-bit bytes. 4.6cartridge: A case containing a single supply reel of 12,7
43、mm wide magnetic tape with a leader attached at the outer end. 4.7Cyclic Redundancy Check (CRC) character: A 64-bit character, generated by a mathematical computation, used for error detection. 4.8Early Warning (EW): A signal generated by the drive indicating the approaching end of the recording are
44、a. 4.9Error-Detecting Code (EDC): A mathematical computation yielding check bytes used for error detection. 4.10End-Of-Tape marker (EOT): A hole punched on the centreline of the tape towards the end farthest from the leader. 4.11Entity: A group of twenty physical blocks treated as a logical unit and
45、 recorded on a logical track. 4.12Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC. 4.13flux transition position: The point which exhibits the maximum free-space flux density normal to the tape surface. 4.1
46、4flux transition spacing: The distance on the magnetic tape between successive flux transitions. 4.15Logical Block: The two physical blocks simultaneously written on, or read from, the two physical tracks of a logical track. 4.16logical track: A pair of physical tracks that are written or read simul
47、taneously. 4.17magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on computers and associated equipment. 4.18Master Standard Reference Tape: A tape selected as the standard for reference field, signal amplitude, resolution, peakshift, and
48、 overwrite characteristics. Note - The Master Standard Reference Tape is maintained by the Quantum Corporation. 4.19object: A Record or a Tape Mark Block. 4.20page: A logical division of a physical block. 4.21physical block: A set of contiguous bytes recorded on a physical track and considered as a
49、unit. 4.22physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). 4.23physical track: A longitudinal area on the tape along which a series of magnetic signals can be recorded. 4.24Record: A collection of User Bytes, the number of which is determined by the host. 4.25Reference Edge: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT holes to the left and the EOT hole to the right of the observer. 4.2