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1、JIS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Information technology - Data interchange on 12.7 mm 208-track magnetic tape cartridges - DLT6 format ICs 35.220.23 Reference number : JIS X 6174 : 2004 (E) PROTECTED BY COPYRIGHT 33 s Copyright Japanese Stan
2、dards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- X 6174 : 2004 (ISO/IEC 16382 : 2000) Foreword This translation has been made base
3、d on the original Japanese Industrial Standard established by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee according to the proposal of establishing a Japanese Industrial Standard from Japan Electronics and Information Technology In
4、dustries Association (JE1TA)lJapanese Standards Association (JSA) with the draft of Industrial Standard based on the provision of Article 12 Clause 1 of the Industrial Standardization Law. This Standard has been made based on ISO/IEC 16382:2000 Information technology - Data interchange on 12.7 mm 20
5、8-track magnetic tape cartridges - DLT6 format for the purpose of making it easier to compare this Standard with International Standard; to prepare Japanese Industrial Standard conforming with International Standard; and to propose a draft of an International Standard which is based on Japanese Indu
6、strial Standard. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical proper
7、ties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said
8、 technical properties. Date of Establishment: 2004-02-20 Date of Public Notice in Official Gazette: 2004-02-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Information Technology JIS X 6174 :2004, First English edition published in 2005-04 Translate
9、d and published by: Japanese Standards Association 4-1 -24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2005 All rights reserved. No part of this publication may be reproduced or utilized in any
10、 form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan MT PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=W
11、ing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- X 6174 : 2004 (ISO/IEC 16382 : 2000) Contents Page Introduction . 1 Scope 2 Conformance . 2.1 Magnetic tape cartridges . 2.2 Generating systems . 2.3 Receiving systems 3 Normativ
12、e references 4 Terms and definitions 4.1 average signal amplitude . 4.2 azimuth . 4.3 back surface 4.4 beginning-of-tape marker (BOT) . 4.5 block . 4.6 byte 4.7 cartridge 4.8 cyclic redundancy check (CRC) character . 4.9 early warning (EW) . 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.2
13、1 4.22 4.23 4.24 4.25 4.26 error-detecting code (EDC) . end-of-tape marker (EOT) entity error-correcting code (ECC) envelope . envelope size . flux transition position . flux transition spacing group record logical track . magnetic tape . master standard reference tape object page physical recording
14、 density physical track . record 1 1 1 1 1 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo re
15、production or networking permitted without license from IHS -,-,- X 6174 : 2004 (ISO/IEC 16382 : 2000) 4.27 reference edge . 4.28 reference field . 4-29 secondary standard reference tape . 4.30 standard reference amplitude (SRA) 4.31 standard reference current . 4.32 test recording current . 4.33 ty
16、pical field . 5 Conventions and notations 5.1 Representation of numbers 5.2 Dimensions . 5.3 Names 5.4 Acronyms . 6 Environment and safety . 6.1 Cartridge and tape testing environment . 6.2 Cartridge operating environment . 6.3 Cartridge storage environment . 6.4 Safety . 7 Mechanical and electrical
17、 requirements . 7.1 Material . 7.2 Tape length . 7.3 Width . 7.4 Total thickness . 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 7.16 7.17 7.18 7.19 Discontinuity Longitudinal curvature . Out-of-plane distortions . Cupping . Roughness of the coating surfaces . Coating adhesion Layer-to-layer adh
18、esion Modulus of elasticity . 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 6 6 6 6 6 6 6 7 7 7 7 7 8 9 . Flexural rigidity 10 Tensile yield force 10 Electrical resistance 10 Inhibitor tape li Abrasivity 11 Light transmittance of the tape and the leader Coefficient of dynamic friction 12 . 12 . (ii) PROTECTED BY
19、COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- X 6174 : 2004 (ISODEC 16382 : 2000) 8 Magnetic r
20、ecording characteristics 13 8.1 Typical field 14 8.2 Signal amplitude 14 8.3 Resolution 14 8.4 Overwrite 14 8.5 Peak shift 14 9 Tape quality 15 9.1 Missing pulses 15 9.2 Missing pulse zone 15 9.3 Tape durability 15 10 General 15 10.1 Bottom side and right cide (figures 8 and 9) 16 10.2 Back side and
21、 left side (figures 10 and 11) 17 10.3 Tape reel (figures 8, 12 and 13) 18 10.4 Tape leader (figures 14, 15 and 16) 18 . . . . 10.5 Front side (figure 17) 20 10.6 Operation of the cartridge (figures 18 and 19) 20 10.7 Tape winding 21 10.8 Moment of inertia 21 10.9 Material 21 11 Method of recording
22、28 11.1 Physical recording density 28 11.2 Channel bit cell length 29 11.3 Flux transition spacing 29 11.4 Read signal amplitude 29 11.5 Azimuth 29 11.6 Channel skew 29 12 Tape format 29 12.1 Reference Edge 30 12.2 Direction of recording 30 12.3 Tape layout 30 12.4 Calibration and directory area 30
23、12.5 Data area 32 13 Data format 36 13.1 Data bytes 36 13.2 Data blocks 36 13.3 Types of blocks 36 . . . . . . . . . . . (iii) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03
24、/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- X 6174 : 2004 (ISO/IEC 16382 : 2000) 13.4 Entities 36 13.5 Envelopes 36 13.6 Block format 37 . . 14 Use of blocks 42 14.1 Data blocks 42 14.2 Filler blocks 42 14.3 End of track blocks (EOTR) 42 14.4 End of da
25、ta blocks (EOD) 42 14.5 ECC blocks 42 . . 15 Format of entities 43 16 Format of envelopes 43 17 Error handling 43 Annex A (normative) Measurement of light transmittance . 44 Annex B (normative) Generation of the data block CRCs . 47 Annex C (normative) ECC generation 48 Annex D (normative) Generatio
26、n of page CRCs 51 Annex E (normative) Format of MAP entries 52 Annex F (normative) Format of control field 1 53 Annex G (normative) Format of control field 2 54 Annex H (informative) Recommendations for transportation 55 Annex J (informative) Inhibitor tape 56 Annex K (informative) Recommendations o
27、n tape durability . 57 Annex L (informative) Handling guidelines 58 . . iv PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking p
28、ermitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS X 6174 : 2004 (ISODEC 16382 : 2000) Information technology - Data interchange on 12.7 mm 208-track magnetic tape cartridges - DLTG format Introduction This Japanese Industrial Standard has been prepared based on the first editi
29、on of ISO/IEC 16382 Information technology - Data interchange on 12.7 mm 208-track magnetic tape cartridges - DLTG format published in 2000 without modifying the technical contents. Portions underlined with dots are the matters not stated in the original International Standard. 1 This Standard speci
30、fies 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 Digital Linear Tape 6 (DLT 6) - and a recording metho
31、d, thereby allowing data interchange between drives. Together with a labelling standard, for instance, JIS X 0601 for magnetic tape labelling, it allows full data interchange by means of such magnetic tape cartridges. NOTE : The International Standard corresponding to this Standard is as follows. In
32、 addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/ IEC Guide 21. ISO/IEC 16382 : 2000 Information technology - Data interchange on 12.7 mm 208
33、-track magnetic tape Cartridges - DLT 6 format (IDT) Scope 2 Conformance 2 . 1 with this Standard if it satisfies all mandatory requirements of this Standard. Magnetic tape cartridges A magnetic tape cartridge shall be in conformance The tape requirements shall be satisfied throughout the extent of
34、the tape. 2.2 Generating systems A system generating a magnetic tape cartridge for interchange shall be in conformance with this Standard if all the recordings that it makes on a tape according to 2 . 1 meet the mandatory requirements of this Standard. In addition, a claim of conformance shall state
35、 - 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 the data into blocks, and - the registered identification number(s) of the implemented compression algorithm( s). PROTECTED BY COPYRIGHT
36、Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 X 6174 : 2004 (ISOAEC 16382 : 2000) 2.3 Receiving system
37、s A system receiving a magnetic tape cartridge for interchange shall be in conformance with this 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, an
38、d are able to be applied to de-compress data prior to making such data available to the host, - the registered identification number(s) of the implemented compression algorithm(s1. 3 Normative references The following standards contain provisions which, through reference in this Standard, constitute
39、 provisions of this Standard. If the indication of the year of coming into effect or the year of publication is given to these referred standards, only the edition of the indicated year constitutes the provision of this Standard but the revision and amendment made thereafter do not apply. Informatio
40、n processing -File structure and labelling of magnetic tapes for information interchange NOTE : IS0 1001:1986 Information processing - File structure and labelling of magnetic tapes for information interchange is equivalent to the said standard. Technical drawings - Method of indicating surface text
41、ure JIS X 0601:2000 IS0 1302:1992 ISO/IEC 11576: 1994 Information technology - Procedure for the registration of algorithms for the lossless compression of data 4 and definitions apply. Terms and definitions For the purposes of this Standard, the following terms 4.1 average signal amplitude the aver
42、age peak-to-peak value of the output signal from the read head at the physical recording density of 2 578 ftpmm measured over a minimum length of track of 25.4 mm, exclusive of missing pulses 4.2 line of the recording made on a track from a line normal to the reference edge azimuth the angular devia
43、tion, in degrees of arc, of the mean flux transition 4.3 back surface used to record data the surface of the tape opposite the magnetic coating which is 4.4 beginning-of-tape marker (BOT) tape towards the end nearest to the leader a hole punched on the centreline of the 4.5 block as a unit a set of
44、contiguous bytes recorded on a physical track and considered 4.6 byte an ordered set of bits acted upon as a unit NOTE : In this Standard, all bytes are 8-bit bytes. 4.7 cartridge tape with a leader attached at the outer end a case containing a single supply reel of 12.7 mm wide magnetic PROTECTED B
45、Y COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 09:31:11 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 X 6174 : 2004 (ISOAEC 16382 : 2000) 4.8 cycl
46、ic redundancy check (CRC) character a 64-bit character, generated by a mathematical computation, used for error detection 4.9 early warning (EW) a signal generated by the drive indicating the approaching end of the recording area 4.10 error-detecting code (EDC) a mathematical computation yielding ch
47、eck bytes used for error detection 4.11 end-of-tape marker (EOT) towards the end farthest from the leader a hole punched on the centreline of the tape 4.12 entity logical track, except filler blocks, if any a group of twenty blocks treated as a logical unit and recorded on a 4.13 error-correcting co
48、de (ECC) a mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC 4.14 envelope a group of entities 4.15 envelope size the number of entities in an envelope 4.16 flux transition position flux density normal to the tape surface the point which exhibits the maximum free-space 4.17 flux transition spacing the distance on the magnetic tape between successive flux transitions 4.18 group record a record consisting of a series of records of equal size 4.19 logical track simultaneousl