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1、Reference number ISO/IEC 15896:1999(E) ISO/IEC 1999 INTERNATIONAL STANDARD ISO/IEC 15896 First edition 1999-12-15 Information technology Data interchange on 12,7 mm 208-track magnetic tape cartridges DLT 5 format Technologies de linformation change de donnes sur cartouches de bande magntique de12,7
2、mm, 208 pistes Format DLT 5 ISO/IEC 15896:1999(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 computer
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5、ral 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 either I
6、SO 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 iii Contents Section 1 -
7、 General1 1 Scope1 2 Conformance1 2.1 Magnetic tape cartridges1 2.2 Generating systems1 2.3 Receiving systems1 3 Normative references1 4 Definitions1 4.1 Average Signal Amplitude2 4.2 azimuth2 4.3 back surface2 4.4 Beginning-Of-Tape marker (BOT)2 4.5 block2 4.6 byte2 4.7 cartridge2 4.8 Cyclic Redund
8、ancy Check (CRC) character2 4.9 Early Warning (EW)2 4.10 Error-Detecting Code (EDC)2 4.11 End-Of-Tape marker (EOT)2 4.12 Entity2 4.13 Error-Correcting Code (ECC)2 4.14 Envelope2 4.15 Envelope size2 4.16 flux transition position2 4.17 flux transition spacing2 4.18 logical track2 4.19 magnetic tape2 4
9、.20 Master Standard Reference Tape2 4.21 object2 4.22 page2 4.23 physical recording density2 4.24 physical track2 4.25 Record2 4.26 Reference Edge2 4.27 Reference Field2 4.28 Secondary Standard Reference Tape2 4.29 Standard Reference Amplitude (SRA)3 4.30 Standard Reference Current3 ISO/IECISO/IEC 1
10、5896:1999 (E) iv 4.31 Test Recording Current3 4.32 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 environment3 6.2 Cartridge operating environment4 6.3 Cartridge storage envi
11、ronment4 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 Longitudinal curvature5 7.6.1 Requirement5 7.
12、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 Requirements6 7.11.2 Procedure6 7.12 Modulus of e
13、lasticity7 7.12.1 Requirement7 7.12.2 Procedure7 7.13 Flexural rigidity7 7.13.1 Requirement7 7.13.2 Procedure7 7.14 Tensile yield force8 7.14.1 Procedure8 7.15 Electrical resistance8 7.15.1 Requirement8 7.15.2 Procedure8 7.16 Inhibitor tape9 7.17 Abrasivity9 7.17.1 Requirement9 7.17.2 Procedure9 7.1
14、8 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 ISO/IEC 15896:1999 (E)ISO/IEC v 7.19.3 Procedure for the measurement of the friction b
15、etween the magnetic surface or the back surface and calcium titanate ceramic 10 8 Magnetic recording characteristics 10 8.1 Typical Field 11 8.2 Signal amplitude 11 8.3 Resolution 11 8.4 Overwrite 11 8.4.1 Requirement 11 8.5 Peak shift 11 8.5.1 Requirement 11 8.5.2 Procedure 11 9 Tape quality 12 9.1
16、 Missing pulses 12 9.1.1 Requirement 12 9.2 Missing pulse zone 12 9.2.1 Requirement 12 9.3 Tape durability 12 Section 3 - Mechanical specifications of the tape cartridge 12 10 General 12 10.1 Bottom side and right side 13 10.2 Back side and left side 14 10.3 Tape reel 14 10.4 Tape leader 15 10.5 Fro
17、nt side 16 10.6 Operation of the cartridge 16 10.7 Tape winding 17 10.8 Moment of inertia 17 10.9 Material 18 Section 4 - Requirements for an interchanged tape 27 11 Method of recording 27 11.1 Physical recording density 27 11.2 Channel bit cell length 27 11.2.1 Average Channel bit cell length 27 11
18、.2.2 Long-term average Channel bit cell length 27 11.2.3 Short-term average Channel bit cell length 27 11.3 Flux transition spacing 27 11.4 Read signal amplitude 27 11.5 Azimuth 28 11.6 Channel skew 28 12 Tape format 28 12.1 Reference Edge 28 12.2 Direction of recording 28 12.3 Tape layout 28 12.4 C
19、alibration and Directory Area 28 12.4.1 Scratch Area 29 12.4.2 Guard Area G1 29 12.4.3 Calibration Tracks Area 29 12.4.4 Guard Area G2 30 12.4.5 Directory Area 30 12.4.6 Guard Area G3 30 12.5 Data Area 30 12.5.1 Physical tracks 31 ISO/IEC ISO/IEC 15896:1999 (E) vi 12.5.2 Logical tracks33 13 Data for
20、mat34 13.1 Data Bytes34 13.2 Data Blocks34 13.3 Types of Blocks34 13.4 Entities34 13.5 Envelopes34 13.6 Block format34 13.6.1 Preamble35 13.6.2 Sync35 13.6.3 Data Field35 13.6.4 EDC36 13.6.5 Control Field 1 (CF1)37 13.6.6 Control Field 2 (CF2)38 13.6.7 CRC39 13.6.8 Postamble39 14 Use of blocks39 14.
21、1 Data Blocks39 14.2 Filler Blocks39 14.3 End of Track Blocks (EOTR)40 14.4 End of Data Blocks (EOD)40 14.5 ECC Blocks40 15 Format of Entities40 16 Format of Envelopes40 17 Error handling40 Annexes A - Measurement of light transmittance41 B - Generation of the Data Block CRCs44 C - ECC generation45
22、D - Generation of page CRCs48 E - Format of MAP entries49 F - Format of Control Field 150 G - Format of Control Field 251 H - Recommendations for transportation52 J - Inhibitor tape53 K - Recommendations on tape durability54 L - Handling guidelines55 ISO/IEC 15896:1999 (E)ISO/IEC ISO/IEC ISO/IEC 158
23、96:1999 (E) 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 participate in the development of International Standard
24、s 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 and non-governmental, in liaison with ISO and IEC
25、, 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. Draft International Standards adopted by the joint
26、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 this International Standard may be the subject of pa
27、tent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. International Standard ISO/IEC 15896 was prepared byECMA European association for standardizing information and communication systems(as ECMA-259) and was adopted, under a special “fast-track proced
28、ure”, 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. viii Introduction This International Standard consti
29、tutes a further development of the magnetic tape cartridge specified in International Standard ISO/IEC 15307. The number of tracks is raised to 208. As a result a native capacity of 35 Gbytes or, with compressed data, of typically at least 70 Gbytes is achieved. ISO/IEC 15896:1999 (E)ISO/IEC Section
30、 1 - General 1Scope This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 208-track magnetic tape cartridge, to enable physical interchangeability of such cartridges between drives. It also specifies the quality of the recorded signals, a format - called
31、Digital Linear Tape 5 (DLT 5) - 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 magnetic tape cartridges. 2Conforma
32、nce 2.1Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of this Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2Generating systems A system generating a magn
33、etic 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 or not one, or more regi
34、stered algorithm(s) are implemented within the system, and are able to compress data received from the host prior to collecting the data into blocks, and the registered identification number(s) of the implemented compression algorithm(s) . 2.3Receiving systems A system receiving a magnetic tape cart
35、ridge for interchange shall be in conformance with this International Standard if it is able to handle any recording made on a tape according to 2.1. In addition, it shall state whether or not one, or more de-compression algorithm(s) are implemented within the system, and are able to be applied to d
36、e-compress data prior to making such data available to the host, the registered identification number(s) of the implemented compression algorithm(s) . 4Definitions For the purposes of this International Standard, the following definitions apply. INTERNATIONAL STANDARD ISO/IEC ISO/IEC 15896:1999(E) I
37、nformation technology - Data interchange on 12,7 mm 208-track magnetic tape cartridges - DLT 5 format 1 3Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editio
38、ns 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 most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently
39、valid International Standards. ISO 1001:1986Information processing - File structure and labelling of magnetic tapes for information interchange. ISO 1302:1992Technical drawings - Method of indicating surface texture. ISO/IEC 11576:1994Information technology - Procedure for the registration of algori
40、thms for the lossless compression of data. ISO/IEC 15896:1999 (E) ISO/IEC 2 4.1Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the physical recording density of 2 254 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pu
41、lses. 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-Tape marker (
42、BOT): A hole punched on the centreline of the tape towards the end nearest to the leader. 4.5block: A set of contiguous bytes recorded on a physical track and considered as a unit. 4.6byte: An ordered set of bits acted upon as a unit. Note - In this International Standard, all bytes are 8-bit bytes.
43、 4.7cartridge: A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer end. 4.8Cyclic Redundancy Check (CRC) character: A 64-bit character, generated by a mathematical computation, used for error detection. 4.9Early Warning (EW): A signal generated by
44、 the drive indicating the approaching end of the recording area. 4.10Error-Detecting Code (EDC): A mathematical computation yielding check bytes used for error detection. 4.11End-Of-Tape marker (EOT): A hole punched on the centreline of the tape towards the end farthest from the leader. 4.12Entity:
45、A group of twenty blocks treated as a logical unit and recorded on a logical track, except Filler Blocks ,if any. 4.13Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC. 4.14Envelope: A group of Entities. 4.1
46、5Envelope size: The number of Entities in an Envelope. 4.16flux transition position: The point which exhibits the maximum free-space flux density normal to the tape surface. 4.17flux transition spacing: The distance on the magnetic tape between successive flux transitions. 4.18logical track: A group
47、 of four physical tracks that are written or read simultaneously. 4.19magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on computers and associated equipment. 4.20Master Standard Reference Tape: A tape selected as the standard for Refere
48、nce Field, signal amplitude, resolution, peak shift, and overwrite characteristics. Note - The Master Standard Reference Tape has been established by the Quantum Corporation. 4.21object: A Record or a page of type Tape Mark. 4.22page: A logical division of a block. 4.23physical recording density: Th
49、e number of recorded flux transitions per unit length of track, expressed in flux transitions per millimetre (ftpmm). 4.24physical track: A longitudinal area on the tape along which a series of magnetic signals can be recorded. 4.25Record: A collection of User Bytes, the number of which is determined by the host. 4.26Reference Edge: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the left and the EOT to the right of the observer. 4.27Reference Field: The Typical Field of