ISO IEC 11321-1992 Information technology 3 81 mm wide magnetic tape cartridge for information interchange helical scan recording DATA DAT format《信息技术 信息交换用3 81.pdf

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1、INTERNATIONAL STANDARD ISO/IEC 11321 First edition 1992-l 2-l 5 Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording - DATA/DAT format Technologies de /information - Cartouche de bande magntl End of Tape (PEOT) physical recording density

2、pre-recording condition (maximum recorded levels) record Reference Recording Field Secondary Standard Amplitude (alihrntion Tape Secondary Standard Reference Tape separator Standard Reference Amplitude tape noise amplitude Tape Reference Edge t rat k 5 Environment and safety 5.1 Testing environment

3、5.2 Operating environment 5.3 Storage environment 5.4 Transportation 5.5 Safety 5.6 Flammability Section 2 : Requirements for the case 6 Dimensional and mechanical characteristics of the case 6.1 General 6.2 Overall dimensions (figures 6 and 7) 6.3 loading grip (figure 6) 6.4 Holding areas (figure 6

4、) 6.5 Notches of the lid (figures 5 and 8) 6.6 Lid dimensions (figures 6 to 8) 6.7 0ptic:tl detection of the heginning and end of tape (figure 9 and 12) 6.8 Bottom side (figures IO and 11) 6.8.1 L.ocking mechanism of the slider- 6.8.2 Access holes 6.8.3 Recognition. sub-datum and write-inhibit holes

5、 6.8.4 IXttum holes 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 7 8 8 10 . . . III ISOAEC 11321:1992 (E) 6.8.5 Access room for tape guides 6.8.6 Holes for accessing the hubs 6.8.7 Internal structure of the lower half (figure 12) 6.8.8 Light path (figure 12) 6.8.9 Support areas (figure 13) 6.

6、8.10 Datum areas (figure 13) 6.8.11 Relationship between support and Datum Areas and Reference Plane Z (figure 14) 6.9 Hubs (figures 15, 16) 6.10 Leader and trailer attachment 6.11 Interface between the hubs and the drive spindles (figure 17) 6.12 Opening of the lid (figure 18) 6.13 Release of the h

7、ub locking mechanism (figures 19, 20) 6.14 Label area (figures 2 I, 22) Section 3 : Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristics of the tape 25 7.1 7.2 7.2.1 7.2.2 Materials Tape length Length of magnetic tape Length of leader and trailer tapes Tape wid

8、th Discontinuities Total thickness Longitudinal curvature Cupping Coating adhesion l.ayer-to-layer adhesion Tensile strength 25 25 25 25 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 25 25 25 25 25 26 26 26 7.10.1 Breaking strength 7.10.2 Yield strength 7.11 Residual elongation 7.12 Electrical resistance of coat

9、ed surfaces 7.13 Light transmittance of tape 26 26 27 27 28 8 Magnetic recording characteristics 28 8.1 Optimum recording field 28 8.2 Signal Amplitude 28 8.3 Resolution 29 8.4 Overwrite 29 8.4.1 Physical Recording Densities of 750,6 and 3 002 ftpmm 29 8.4.2 Physical recording densities of X3.4 ftpm

10、m and 1 001 ftpmm 29 8.5 Ease of erasure 30 8.6 Tape quality 30 8.6.1 Missing pulses 8.6.2 Missing pulse zone 30 30 10 11 11 12 12 12 13 13 13 13 14 14 14 25 iv ISOIIEC 11321:1992 (E) 8.7 Signal-to-noise ratio (S/N) characteristic Section 4 : Format 9 DATA/DAT format 9.1 General 9.2 Basic (iroups 9.

11、2.1 Basic (;roups for Group Format 0 9.2.2 Basic C;roups for Group Format I 9.3 Sub-Groups 30 30 31 31 32 33 9.3.1 G 1 Sulyy11up 33 9.3.2 G2 Sub-group 34 9.3.3 G3 Sub-group 34 9.3.4 G4 Subgroup 35 9.3.5 Main Data Block 40 9.4 Sub-Data area 42 9.4.1 Pack Item No. I 42 9.4.2 Pack Item No. 2 43 9.4.3 P

12、ack Item No. 3 45 9.4.4 Pack Item No. 4 46 9.4.5 Pack Item No. 5 47 9.4.6 Pack Item No. 6 48 9.4.7 Pack Item No. 7 49 9.4.8 Sub Data Block 49 9.5 9.5.1 9.5.2 9.53 9.54 Basic C;roup structure 51 Ilsel- Data System I)ata Record IL) list I heuristic Recovery Data Aren 52 52 56 60 10 Method ol recording

13、 60 10.1 10.2 10.3 10.4 10.5 10.6 10.7 lhysictl recording density tong-Term average bit cell length Short-Term average bit cell length Rate of change f3it shift Read signal amplitude Maximum recorded levels 60 60 60 60 60 60 60 11 Track geometry 60 11.1 Track configuration 11.2 Average track pitch 1

14、1.3 Variations of the track pitch 11.4 Track width 11.5 Track angle 11.6 Track edge linearity 60 61 61 61 62 62 30 30 V ISOAEC 11321:1992 (E) 11.7 Track length 11.8 Ideal tape centreline 11.9 Azimuth angles 12 Recording of blocks on the tape 12.1 Recorded Main Data Block 12.2 Recorded Sub Data Block

15、 12.3 Margin Blocks, Preamble Blocks and Postnmblc Blocks 12.4 Spacer Blocks 13 Format of a track 13.1 Track capacity 13.2 Positioning accuracy 13.3 Tracking scheme 14 Croup Formats 14.1 Group f:ormat 0 14.2 Group f;orm;it 1 14.3 Extended (21y Frames 14.3.1 Extended Icnding Gap Frames 14.3.2 Extende

16、d Trailing Gap Frames 14.4 Types of ;wups 14.4.1 Normal Groups 14.4.2 Spare Groups 14.4.3 Amble Groups 15 Magnetic tape layout 15.1 Load/Unload Area 15.2 Lead-in Area 15.2.1 Preamble 15.2.2 Header 152.3 Format Parameter Set 15.2.4 Master Reference 15.2.5 Postamble 15.3 Partition 15.3.1 Partition Pre

17、amble 15.3.2 Partition Reference 15.3.3 Partition Postamble 15.3.4 Partition Data 153.5 End of Partition (EOP) 15.3.6 Unused Area 15.4 EOI 15.5 Repeated GI-oups 15.6 Repeated Frames within a Normal Group 15.7 Relocation of Defective Groups 62 62 62 62 62 62 62 62 62 62 63 63 66 66 66 67 67 67 67 68

18、68 68 69 69 70 70 70 72 77 83 84 84 84 96 96 97 97 97 97 98 98 vi ISO/IEC 11321:1992 (E) 15.8 Appending 15.8.1 Seamless appending 15.8.2 Non-seamless appending 15.9 Overwrite (figure 83) 15.9.1 Overl;lpeti track width 159.2 Non-overlapped track width 15.9.3 Rules for overwrite Annexes A B c D E F G

19、H J K L M Measurement of the light transmittance of the prisms Recognition Holes Means for opening the lid Measurement of light transmittance of tape and leaders Measurement of Signal-to-Noise Ratio Method for determining the nominal and the maximum allowable recorded levels Representation of 8-bit

20、bytes hy lo-bit pattern Measurement of bit shift Recommendations for transportation Method of measuring track edge linearity Read-After-Write Data allocation and C3 parity 98 99 100 101 102 102 102 103 105 106 107 110 111 112 118 121 122 123 124 vii ISO/IEC 11321:1992 (E) Foreword IS0 (the Internati

21、onal 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 participate in the development of International Standards through technical committees established

22、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- governmental, in liaison with IS0 and IEC, also take part in the work. In the field

23、 of information technology, IS0 and IEC have established a joint technical committee, lSO/lEC JTCI. 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 o/o of th

24、e national bodies casting a vote. International Standard lSO/lEC 11321 was prepared by the European Computer Manufacturers Association (as Standard ECMA-146) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTCI, Irzji)mtalion cchnofogy, in parallel with

25、its approval hy national bodies of IS0 and IEC. Annexes A, D, E, F. G. II, K and M form an integral part of this International Standard. Annexes l3, (, J and L. are for information only. Patents During the preparation of the ECMA standard, information was gathered on patents upon which :rpplicntion

26、of the standard might depend. Relevant patterns were identified as belonging to Hitachi and the Sony Corporation. tlowever, neither ECMA nor lSO/IEC can give authoritative or comprehensive information about evidence, validity or scope of patent and like rights. The patent holders have stated that li

27、cences will be granted under reasonable and non-discriminatory terms. Communications on this subject should be addressed to Hitachi, I.td. European Operation Centre Wnllbrooh Business Centre Green I .ane Hounslow TW3 6NW United Kingdom Sony (orporation Licensing and Trademark Division h-7-35 Kitashi

28、nagnwn Shinngnwa- h II Tokyo 111 Japan . . . VIII INTERNATIONAL STANDARD ISO/IEC 11321:1992 (E) Information technology interchange - 3,t)l mm wide magnetic tape cartridge for information - Helical scan recording - DATA/DAT format Section 1 : General 1 Scope This International Standard specifies the

29、physical and magnetic characteristics of a 3.81 mm wide magnetic tape cartridge to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, and the format and recording method, thereby allowing data interchange by means of such magnetic tape cartridges. 2

30、Conformance 2.1 Magnetic tape cartridge A tape cartridge shall be in conformance with this International Standard if it meets all mandatory requirements specified herein. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating system A system generating ;I magnetic

31、 tape cartridge for interchange shall be entitled to claim conformance to this International Standard if all recordings on the tape meet the mandatory requirements of this International Standard. 2.3 Receiving system A system receiving ;I magnetic tape cartridge for interchange shall be entitled to

32、claim conformance with this International Standard if it is able to handle any recording made on the tape according to this International Standard. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this International Sta

33、ndard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements hased on this International Standard are encouraged lo investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC

34、 and IS0 maintain registers of currently valid International Standards. ISO/R 527: 1466, Plustics Determination of tensile properties ISOilEC 646: 1441, Infcvmation tcchnology - IS0 7-hit coded character set for information inlet-change. IS0 1302: 197X. Technical Drawings - Merhcpd of indicating sur

35、face teniure on drawings IEC 950: 1940, Safety of lrtformation Technology Equipment, including Electrical Business Equipment 4 Definitions For the purpose of this International Standard, the following definitions apply. 4.1 Absolute Frame Number (AFN): A sequence number allocated to, and recorded in

36、, each frame. 4.2 AC erase: A process of erasure utilizing alternating fields of decaying level. 4.3 Area ID: An identifier for each area of the tape specifying the types of frame written therein. 4.4 Automatic Track Finding (ATF): A method by which tracking is achieved. ISO/IEC 11321:1992 (E) 4.5 A

37、verage Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the fundamental frequency of the specified physical recording density, over a minimum of 7,8 mm of track, exclusive of missing pulses. 4.6 azimuth: The angular deviation, in degrees, minutes and second

38、s of arc, made by the mean flux transition line with the line normal to the centreline of the recorded track. 4.7 back surface: The surface of the tape opposite to the magnetic coating which is used to record data. 4.8 byte: An ordered set of hits acted upon as a unit. 4.9 cartridge: A case containi

39、ng magnetic tape stored on twin hubs. 4.10 Channel bit: A bit after X-to-10 transformation. 4.11 Data Format ID: An identifier specifying which data format is heing used on the tape. 4.12 End of Data (EOD): The point where the host stopped writing data on the tape. 4.13 End of Information (EOI): A g

40、roup which indicates the end of partition area in a tape. 4.14 End of Partition (EOP): A group which indicates the end of data area in a partition. 4.15 Error Correcting Code (ECC): A mathematical algorithm yielding check bytes used for the detection and correction of errors. 4.16 flux transition po

41、sition: That point which exhihits maximum free-space flux density normal to the tape surface. 4.17 flux transition spacing: The distance along a track between successive flux transitions. 4.18 frame: A pair of adjacent tracks with azimuth of opposite polarity, in which the track with the positive az

42、imuth precedes that with the negative azimuth. 4.19 group: A number of frames constituting a recorded unit. 4.20 Logical Beginning of Tape (LBOT): The point along the length of the tape where the recording of data for interchange commences. 4.21 Logical End of Tape (LEOT): A point along the length o

43、f the tape which indicates the approach, in the direction of tape motion, of the partition boundary or physical end of tape. 4.22 magnetic tape: A tape which will accept and retain magnetic signals intended for input, output, and storage purposes on computers and associated equipment. 4.23 Master re

44、ference: The area which contains partition information in the tape. 4.24 Master Standard Amplitude Calibration Tape: A pre-recorded tape on which the standard signal amplitudes have been recorded in the tracks of positive azimuth, 23,0 pm wide, at nominal track pitch, on an AC- erased tape. Note I -

45、 The tape includes recordinKs made at X3.4 tipmm. 333.0 tipmm. 51Mj.4 ftpmm, I 001 iipmm and I 501 ftpmm. Note -7 - The Master Standard Amplitude Calihralion Tap+ has been established by the Sony Corporation. 4.25 Master Standard Reference Tape: A tape selected as the standard for Reference Recordin

46、g Field, Signal Amplitude, Resolution Overwrite and Signal-to-Noise Ratio. Note 3 - The Master Standard Reference Tape has been rstahlished by the Sony Corporation. 4.26 optimum recording field: In the plot of Average Signal Amplitude against the recording field at the physical recording density of 3 002 ftpmm, the field that causes the maximum Average Signal Amplitude. 4.27 partition: Partition of a tape in which user data is recorded.