ISO IEC 14840-1996 Information technology - 12 65 mm wide magnetic tape cartridge for information interchange - Helical scan recording - Data-D3-1 format《信息技术 信.pdf

1、INTERNATIONAL STANDARD ISO/IEC 14840 First edition 1996-08-01 Information technology - 12,65 mm wide magnetic tape cartridge for information interchange - Helical scan recording - Data-D34 format Technologies de /information - Cat-touche de bande magktique de 12,65 mm de large pour /&change dinforma

2、tion - Enregistrement par balayage en spirale - Format de don&es-D3-7 ISO/IEC 14840:1996 (E) Contents Section 1 - General Page 1 1 scope 2 Conformance 2.1 Magnetic tape cartridge 2.2 Generating system 2.3 Receiving system 3 Normative References 4 Definitions 4.1 a.c. erase 4.2 algorithm 4.3 Average

3、Signal Amplitude 4.4 azimuth 4.5 back surface 4.6 Beginning of Tape (BOT) 4.7 Beginning of Tape Sense Slot 4.8 byte 4.9 cartridge 4.10 character 4.11 Codeword Digital Sum (CDS) 4.12 Cyclic Redundancy Check (CRC) Character 4.13 Data Area Reference Point 4.14 Data Records 4.14.1 Logical Data Record (L

4、DR) 4.14.2 Processed Data Record (PDR) 4.14.3 User Data Record (UDR) 4.15 Digital Sum Variation (DSV) 4.16 End of Tape (EOT) 4.17 End of Tape Sense Slot 4.18 Error Correcting Code (ECC) 4.19 File safe 4.20 Fixed Scan Group Header 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 8 ISO/IEC 1996 All

5、 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 writlng from the publisher. ISO/IEC Copyright Office l Case Postale 56 * CH-1211

6、Genbve 20 l Switzerland Printed in Switzerland ii 0 ISO/lEC ISO/IEX 14840:1996 (E) 4.21 flux transition position 4.22 flux transition spacing 4.23 Helical Time Code (HTC) 4.24 Internal Leader Header (ILH) 4.25 Logical Block Number 4.26 magnetic tape 4.27 Master Standard Reference Tape 4.28 Packet 4.

7、29 Packet ldentifier 4.30 Packet Trailer 4.31 physical recording density 4.32 Postamble 4.33 Preamble 4.34 processed data 4.35 Reference Fields 4.36 resolution 4.37 Scan Group 4.38 Scan Group Pair 4.39 Scan Group Start Data (SGSD) 4.40 Secondary Standard Reference Tape 4.41 Standard Reference Amplit

8、udes (SRA) 4.42 Standard Reference Currents (Ir) 4.43 Tape Reference Edge 4.44 Test Recording Currents (TRC) 4.45 track 4.46 track angle 4.47 Typical Field (TF) 4.48 Variable Scan Group Header 4.49 zero crossing 5 Conventions and Notations 5.1 Representation of numbers 5.2 Names 6 Acronyms 7 Environ

9、ment and Safety 7.1 Testing environment 7.2 Operating environment 7.3 Storage environment 7.4 Transportation 7.5 Safety 7.6 Flammability Section 2 - Requirements for the Cartridge 8 Dimensional and Mechanical Characteristics of the Cartridge 8.1 Elements of the cartridge 8.2 Reference Planes of the

10、case 8.3 Dimensions of the case 8.3.1 Overall dimensions 8.3.2 Locating areas 8.3.3 Reference points for Plane Y 8.3.4 Reference point for Plane Z 8.3.5 Locating notches 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 7 . . . III ISOAEC 14840:1996 (E) 0 ISOAEC 8.3.6 M&insertion pro

11、tection 8.3.7 Stacking ribs 8.3.8 Recognition notches 8.3.9 Write-inhibit mechanism 8.3.10 Label areas of the top side 8.3.11 Label areas of the rear side 8.3.12 Label area on the right hand side 8.3.13 Label area on the bottom side 8.3.14 Central window 8.3.15 Case opening 8.3.16 Tapers of the case

12、 8.4 Flexibility of the case 8.4.1 Requirements 8.4.2 Procedure 8.5 Tape reel 8.5.1 Locking mechanism 8.5.2 Axis of rotation of the reel 8.53 Metallic insert 8.5.4 Toothed rim 8.5.5 Hub of the reel 8.5.6 Relative positions of hub and case 8.5.7 Characteristics of the toothed rim 8.6 Magnetic tape 8.

13、6.1 Tape wind 8.6.2 Wind tension 8.6.3 Circumference of the tape reel 8.6.4 Moment of inertia 8.7 Leader block 8.7.1 Dimensions of the leader block 8.7.2 Attachment of the tape to the leader block 8.7.3 Latching the leader block 8.8 Reflection density of the case 8.8.1 Requirement 8.8.2 Test Equipme

14、nt 8.8.3 Test method 8.9 Colour Section 3 - Requirements for the Unrecorded Tape 9 Mechanical, physical and dimensional characteristics of the tape 9.1 Materials 9.2 Tape length 9.3 Tape width 9.4 BOT and EOT Sense Slots 9.5 Discontinuities 9.6 Thickness 9.7 Longitudinal curvature 9.8 Straightness 9

15、.9 Cupping 9.10 Out-of-plane distortions 9.11 Coating adhesion 9.12 Layer-to-layer adhesion 9 9 9 10 10 11 11 12 12 12 13 13 13 13 14 14 14 14 14 15 15 16 16 16 16 16 16 17 17 17 17 18 18 19 18 19 27 27 27 27 27 27 27 27 27 28 28 28 28 29 iv 0 ISO/IEC ISOAEC 14840:1996 (E) 9.13 Youngs Modulus for th

16、e tape 9.14 Surface roughness 9.15 Electrical resistance of coated surfaces 9.16 Tensile strength 9.16.1 Breaking strength 9.16.2 Offset yield strength 9.17 Residual elongation 9.18 Light transmittance of the tape 10 Magnetic Recording Characteristics 10.1 General 10.2 Basis for measuring the magnet

17、ic recording characteristics of the unrecorded tape. 10.3 Test conditions 10.4 Typical Field 10.5 Signal Amplitude 10.6 Resolution 10.7 Ease of Erasure 10.8 Narrow-band Signal-to-Noise Ratio (NB-SNR) 10.9 Tape Quality 10.9.1 Missing pulses 10.9.2 Missing pulse zones Section 4 - Requirements for an I

18、nterchanged Tape 11 Format of a helically recorded track 11.1 General description of the write data path 11.1.1 Formation of Packets 11.1.2 Formation of Scan Groups 11.1.3 Channel separation 11.1.4 Interleave buffer 11.1.5 Sync Blocks 11.1.6 Randomization 11.1.7 Logical helical track 11.1.8 Byte tra

19、nslation 11.1.9 Recording of tracks 11.2 Packet format 11.2.1 Packet definition 11.2.2 Packet ID 11.2.3 UDR 11.2.4 Packet Trailer 11.3 Scan Group 11.3.1 Scan Group Start Data (SGSD) 11.3.2 Helical Time Code (HTC) 11.3.3 Header 11.3.4 Data Part 11.3.5 Trailer 11.3.6 Types of Scan Group 11.3.7 Protect

20、ion of Scan Groups 11.4 Write data channel 11.4.1 Scan Group sections 11.4.2 Interleave Buffer 29 29 30 30 30 30 31 31 31 31 31 31 32 32 32 32 32 33 33 33 34 34 34 34 34 34 34 34 34 34 34 34 36 36 36 37 37 38 39 39 40 44 44 44 47 48 48 49 V ISO/IEC 14840:1996 (E) 0 ISO/IEC 11.4.3 Sync Blocks 11.4.4

21、Layout of a logical helical track 11.4.5 Byte translation 12 Track geometry 12.1 General 12.2 Helically recorded tracks 12.2.1 Track width 12.2.2 Adjacent track pitch 12.2.3 Track angle 12.2.4 Straightness of a track 12.2.5 Track length 12.2.6 Azimuth angles 12.2.7 Location of positive azimuth track

22、s 12.2.8 Location of Data Area Reference Point 12.3 Time Code Track 12.3.1 Track location 12.3.2 Azimuth 12.4 Servo Control Track 12.4.1 Track location 12.4.2 Azimuth 12.5 Reserved Longitudinal Track 13 Method of recording helical tracks 13.1 Tape condition before recording 13.2 Method of recording

23、13.3 Physical Recording Densities 13.4 Nominal Bit Cell Length 13.5 Long-term Average Bit Cell Length 13.6 Short-term Average Bit Cell Length (STA) 13.7 Rate of Change of the STA 13.8 Bit shift 13.9 Read signal amplitude 14 Servo Control Track 14.1 Format 14.2 Relative locations of Pulse Pairs and S

24、can Group Pairs 14.3 Polarity of magnetisation 14.4 Read signal amplitude 14.5 Quality of the Servo Control Track 15 Time Code Track 61 15.1 Format 61 15.1.1 Count bits 15.1.2 Supplementary Data 15.1.3 Phase bit 15.1.4 Synchronizing pattern 15.2 Extent of a Time Code 15.3 Relative locations of the T

25、ime Code and Scan Group Pairs 15.4 Form of recording 61 61 61 61 61 61 61 15.4.1 Nominal bit density 15.4.2 Nominal bit cell length 62 62 52 53 54 55 55 56 56 56 56 56 56 56 56 56 57 57 57 57 57 57 57 59 59 59 59 60 60 60 60 60 60 60 60 60 60 60 61 vi 0 ISOAEC ISOAEC 14840:1996 (E) 15.4.3 Bit shift

26、15.5 Read signal amplitude 15.6 Quality of the Time Code Track 16 Tape format 63 16.1 Layout of the magnetic tape 63 16.2 Data Area 64 16.2.1 Capacity of tape sectors 16.2.2 Sequence of Scan Groups on the tape 16.23 Write skips 16.2.4 Appended Data 16.3 EOD 64 64 66 66 66 Annexes A - Representation

27、of the CRC used in 11.2 - Packet Format B- Representation of the CRC used in 11.3 - Scan Group C - Representation of B-bit bytes by U-bit patterns D- Generation of Outer ECC and Inner ECC E- Measurement of the geometry of helical tracks F - Measurement of Bit Shift G - Label - Media type II - Reflec

28、tion density of the case J - Measurement of light transmittance of tape K - Recommendations for transportation L- Guidelines for handling tape cartridges M - Helical and Longitudinal Time Codes N - Representation of the CRC used in 11.3.2 - HTC P - Bibliography 62 62 62 67 68 69 81 83 86 90 96 97 10

29、0 101 102 104 105 vii ISO/IEC 14840: 1996(E) 0 ISO/IEC Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC par- ticipate in

30、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 international organizations, governmental and non-

31、 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, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting

32、. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 14840 was prepared by ECMA (as Standard ECMA-210) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, I

33、nformation technology, in parallel with its approval by national bodies of IS0 and IEC. Annexes A to D, F, G, J, M and N form an integral part of this International Standard. Annexes E, H, K, L and P are for information only. VIII INTERNATIONAL STANDARD OISO/IEC ISO/IEC 14840:1996 (E) Information te

34、chnology - 12,65 mm wide magnetic tape cartridge for information interchange - Helical scan recording - Data-D3-1 format Section 1 - General 1 Scope This International Standard specifies the physical and magnetic characteristics of a magnetic tape cartridge, using magnetic tape 12,65 mm wide, so as

35、to provide physical interchangeability of such cartridges. It also specifies the quality of the recorded signals, the recording method and the recorded format, thereby allowing data interchange between drives by means of such magnetic tape cartridges. This International Standard specifies three type

36、s of cartridge which, for the purposes of this International Standard, are referred to as Type A, Type B and Type C. For Type A, the magnetic tape has a nominal length of 91 m and a nominal capacity of 10 GBytes. For Type B, the magnetic tape has a nominal length of 204 m and a nominal capacity of 2

37、5 GBytes. For Type C, the magnetic tape has a nominal length of 392 m and a nominal capacity of 50 GBytes. Together with a Standard for Volume and File Structure this International Standard provides for full data interchange between data processing systems. 2 Conformance 2.1 Magnetic tape cartridge

38、A claim of conformance with this International Standard shall specify the Type of the cartridge. It shall be in conformance with this International Standard if l the cartridge meets all the requirements of clause 4 and clauses 7 to 10 l the recording on the tape meets the requirements of clauses 11

39、to 16 l for each recorded Packet the algorithm used for processing the data therein, if the recorded data has been processed, has been registered and the registered identification is included in Byte 13 of the Packet ID of this Packet (see 11.2.2) 2.2 Generating system A system generating a magnetic

40、 tape cartridge for interchange shall be entitled to claim conformance with this International Standard if all the recordings that it makes, on all three Types of cartridge, meet the mandatory requirements of this International Standard. A claim of conformance shall state whether or not one, or more

41、, registered algorithm(s) is (are) implemented and, if so, the registered number(s) of (all) the implemented algorithm(s). 2.3 Receiving system A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standard if it is able to handle any recording

42、 made on the tape according to this International Standard, and for all three Types. A claim of conformance shall state whether or not one, or more, registered algorithm(s) is (are) implemented and, if so, the registered number(s) of (all) the implemented algorithm(s). 3 Normative References The fol

43、lowing 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 based on this International Standard are en

44、couraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. ISO/R 527: 1966 Plastics - Determination of tensile properties. 1 ISO/IEC 14840:1996 (E) 0 ISOmX IS0 10

45、01:1986 IS0 1302: 1992 IS0 683-13:1986 ISO/IEC 11576: 1994 IEC 950: 1995 Information processing - File structure and kzbelling of magnetic tapes for information interchange. Technical drawings - Method of indicating surface texture. Heat-treatable steels, alloy steels and free-cutting steels - Part

46、13: Wrought stainless steels. Information technology - Procedure for the registration of algorithms for the lossless compression of data. Safety of information technology equipment, including electrical business equipment. 4 Definitions For the purposes of this International Standard, the following

47、definitions apply. 4.1 a.c. erase: A process of erasure utilizing alternating magnetic fields of decaying intensity. 4.2 algorithm: A set of rules for transforming the logical representation of data. 4.3 Average Signal Amplitude: The average peak-to-peak value of the signal output of a read head mea

48、sured over a minimum of 3 000 flux transitions, exclusive of missing pulses. 4.4 azimuth: The angular deviation, in degrees of arc, of the recorded flux transitions on a track from the line normal to the track centreline. 4.5 back surface: The surface of the tape opposite to the magnetic coating use

49、d to record data. 4.6 Beginning of Tape (BOT): The point along the tape indicated by the start of the density identification burst. 4.7 Beginning of Tape Sense Slot: A slot on the centreline of the tape indicating the beginning of usable tape. 4.8 byte: An ordered set of 8 bits acted upon as a unit. 4.9 cartridge: A case containing a single reel of magnetic tape with a leader attached at the BOT end. 4.10 character: A unit of information represented by one or more bytes. 4.11 Codeword Digital Sum (CDS): The value of the Digital Sum Variation (DSV) ta