ISO IEC 14833-1996 Information technology - Data interchange on 12 7 mm 128-track magnetic tape cartridges - DLT 3 format《信息技术 在12 7mm宽、128道盒式磁带上的数据交换 DLT3格式》.pdf

1、INTERNATIONAL STANDARD ISO/IEC 14833 First edition 1996-03-I 5 Information technology - Data interchange on 12,7 mm 1284rack magnetic tape cartridges - DLT 3 format Technologies de /information - ichange de don&es sur cartouches de bande magnbtique de 12,7 mm, 128 pistes - Format DLT 3 Reference num

2、ber ISO/IEC 14833:1996(E) ISO/IEC 14833:1996 (E) Contents Page Section 1: General 1 1 scope 2 Conformance 2.1 Magnetic tape cartridges 2.2 Generating systems 2.3 Receiving systems 3 References 4 Definitions 4.1 Average Signal Amplitude 4.2 azimuth 4.3 back surface 4.4 Beginning-Of-Tape marker (BOT)

3、4.5 byte 4.6 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 ma

4、gnetic tape 4.18 Master Standard Reference Tape 4.19 object 4.20 page 4.21 physical block 4.22 physical recording density 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 8 ISO/IEC 1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any

5、 form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office l Case Postale 56 * CH-1211 Genbve 20 * Switzerland Printed in Switzerland ii OISO/IEC ISO/IEC 14833:1996 (E) 4.23 physical track 4.24 Rec

6、ord 4.25 Reference Edge 4.26 Reference Field 4.27 Secondary Standard Reference Tape 4.28 Standard Reference Amplitude (SRA) 4.29 Standard Reference Current 4.30 Test Recording Current 4.31 Typical Field 5 Conventions and notations 5.1 Representation of numbers 5.2 Dimensions 5.3 Names 5.4 Acronyms 6

7、 Environment and safety 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 4 7 Mechanical and electrical requirements 7.1 Mate

8、rial 7.2 Tape length 7.3 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 th

9、e coating surfaces 7.12.1 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 4 5 5 5 6 . . . III ISO/IEC 14833:1996 (E) OISO/IEC 7.14.1 Requirements 7.14.2 Procedure 7.15 Modulus of elasticity 7.151 Requirement 7.

10、152 Procedure 7.16 Flexural rigidity 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 Procedure 7.21 Light transmittance of the tape and the leade

11、r 7.22 Coefficient of dynamic friction 7.22.1 Requirements 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

12、 zone 9.2.1 Requirement 9.3 Tape durability Section 3: Mechanical specifications of the tape cartridge 6 6 7 7 7 7 7 7 8 8 8 8 8 9 9 9 9 9 9 10 10 11 11 11 11 11 11 11 11 12 12 12 12 12 12 12 10 General 12 iv OISO/IEC ISO/IEC 14833:1996 (E) 10.1 Bottom side and right side 13 10.2 Back side and left

13、side 14 10.3 Tape reel 14 10.4 Tape leader 15 10.5 Front 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 26 11 Method of recording 26 11.1 Physical recording density 11.2 Channel bit cell leng

14、th 26 26 11.2.1 Average Channel bit cell length 11.2.2 Long-term average Channel bit cell length 11.2.3 Short-term average Channel bit cell length 26 26 26 11.3 Flux transition spacing 26 11.4 Read signal amplitude 26 11.5 Azimuth 27 11.6 Channel skew 27 12 Tape format 27 12.1 Reference Edge 12.2 Di

15、rection of recording 12.3 Tape layout 12.4 Calibration and Directory Area 27 27 27 27 12.4.1 Scratch Area 28 12.4.2 Guard Area Gl 28 12.4.3 Calibration Tracks Area 28 12.4.4 Guard Area G2 29 12.4.5 Directory Area 29 12.4.6 Guard Area G3 29 12.5 Data Area 29 12.5.1 Physical tracks 12.5.2 Width of the

16、 physical tracks 12.5.3 Logical tracks 12.5.4 Locations of the physical tracks 12.5.5 Layout of tracks in the Data Area 30 30 30 30 31 13 Data format 32 13.1 Data Bytes 32 13.2 Logical Blocks 32 13.3 Data Blocks 32 13.4 Types of Logical Blocks 33 13.5 Entities 33 V ISO/IEC 14833:1996 (E) OISO/IEC 13

17、.6 Logical Block format 33 13.6.1 Preamble 34 13.6.2 Sync 34 13.6.3 Data Field 34 13.6.4 EDC 36 13.6.5 Control Field 1 (CFl) 36 13.6.6 Control Field 2 (CF2) 37 13.6.7 CRC 38 13.6.8 Postamble 38 14 Use of Logical Blocks 38 14.1 Data Blocks 38 14.2 Filler Blocks 39 14.3 End of Track Blocks (EOTR) 39 1

18、4.4 End of Data Blocks (EOD) 39 14.5 ECC Blocks 39 15 Format of Entities 16 Error handling Annexes A - Measurement of light transmittance B - Generation of the Data Blocks CRCs C - ECC generation D - Generation of page CRCs E - Format of MAP entries F - Format of Control Field 1 G - Format of Contro

19、l Field 2 H - Recommendations for transportation J - Inhibitor tape K - Recommendations on tape durability L - Handling guidelines 39 39 40 43 44 47 48 49 50 51 52 53 54 OISO/IEC ISO/IEC 14833:1996 (E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Elect

20、rotechnical Commission) form the specialized system for worldwide standardization. National bodies that 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 techni

21、cal activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international 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 technic

22、al committee, ISO/IEC JTCl, Draft 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. International Standard ISO/IEC 10090 was

23、prepared by the European Computer Manufacturers Association (as Standard ECMA-209) and was adopted under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTCl, Information technology, in parallel with its approval by national bodies of IS0 and IEC. Annexes A to G form an integr

24、al part of this International Standard. Annexes H to L are for information only. vii ISO/IEC 14833:1996 (E) OISO/IEC Introduction International Standard ISO/IEC 13421 concerns a magnetic tape cartridge of a type different from that of International Standards IS0 9661 and ISO/IEC 11559. Whilst the ma

25、gnetic tape is also 12,7 mm wide, it is characterized by the fact that the physical tracks, recorded and read in pairs, constitute two groups, the first recorded and read in forward direction, the second in reverse direction. International Standard ISO/IEC 13962 constitutes a development of the cart

26、ridge specified in International Standard ISOAEC 13421 in that the number of tracks has been raised from 48 to 112, thus raising the total capacity of the cartridge accordingly. This International Standard specifies a further development of the DLT-formatted cartridges. By raising the number of trac

27、ks to 128 and adopting an enhanced format, a further capacity increase is achieved. INTERNATIONAL STANDARD OISO/IEC ISO/IEC 14833:1996 (E) Information technology - Data interchange on 12,7 mm 12%track magnetic tape cartridges - DLT 3 format Section 1: General 1 Scope This International Standard spec

28、ifies the physical and magnetic characteristics of a 12,7 mm wide, 128-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 3 (DLT 3) - and a recording method. Together with a labe

29、lling standard, for instance International Standard IS0 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information interchange, it allows full data interchange by means of such magnetic tape cartridges. 2 Conformance 2.1 Magnetic tape cartridges A magnetic ta

30、pe 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 system generating a magnetic tape cartridge for interc

31、hange 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. 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be ent

32、itled to claim conformance with this International Standard if it is able to handle any recording made on a tape according to 2.1. 3 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time

33、 of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain r

34、egisters of currently valid International Standards. IS0 1302: 1992, Technical drawings - Method of indicating surface texture. 4 Definitions For the purposes of this International Standard, the following definitions apply. 4.1 Average Signal Amplitude : The average peak-to-peak value of the output

35、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 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 t

36、o the 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. 1 ISO/IEC 14833: 1996 (E) OISO/IEC 4.5 byte : An order

37、ed set of bits acted upon as a unit. NOTE - In this International Standard, all bytes are I-bit bytes. 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, gener

38、ated by a 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 mar

39、ker (EOT) : A 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 co

40、rrection of errors 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

41、two physical blocks 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 stora

42、ge purposes on computers 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 - The Master Standard Reference Tape is maintained by the Quantum Corporation. 4.

43、19 object : A Record or a Tape Mark Block. 4.20 page : A logical division of a physical block. 4.21 physical block : A set of contiguous bytes recorded on a physical track and considered as a unit. 4.22 physical recording density : The number of recorded flux transitions per unit length of track, ex

44、pressed in flux transitions per millimetre (ftpmm). 4.23 physical track : A longitudinal area on the tape along which a series of magnetic signals can be recorded. 4.24 Record : A collection of User Bytes, the number of which is determined by the host. 4.25 Reference Edge : The bottom edge of the ta

45、pe when viewing the magnetic coating of the tape with the BOT to the left and the EOT to the right of the observer. 4.26 Reference Field : The Typical Field of the Master Standard Reference Tape. 4.27 Secondary Standard Reference Tape : A tape the characteristics of which are known and stated in rel

46、ation to those of the Master Standard Reference Tape. NOTE - Secondary Standard Reference Tapes can be ordered under Reference “SSRTiDLTI” until the year 2003 from Quantum Corporation, 333 South Street, Shrewsbury, Mass. 015454195, USA. It is intended that these be used for calibrating tertiary refe

47、rence tapes for routine calibration 4.28 Standard Reference Amplitude (SRA) : The Average Signal Amplitude from the Master Standard Reference Tape when it is recorded with the Test Recording Current at 1 640 ftpmm. 4.29 Standard Reference Current : The current that produces the Reference Field. 4.30

48、 Test Recording Current : The current that is 1,l times the Standard Reference Current. OISO/IEC ISO/IEC 14833:1996 (E) 4.31 Typical Field : In the plot of the Average Signal Amplitude against the recording field at the physical recording density of 1 640 ftpmm, the minimum field that causes an Aver

49、age Signal Amplitude equal to 95 % of the maximum Average Signal Amplitude. 5 Conventions 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