1、BRITISH STANDARD BS ISO/IEC 10777:1991 Implementation of ISO/IEC10777:1991 Information technology 3,81mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format UDC 681.327.636BSISO/IEC10777:1991 This BritishStandard, having been prepared under the directionof the
2、Information Systems Technology Standards Policy Committee, was publishedunder the authority ofthe Standards Board and comesinto effect on 28February1992 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment91/66141 DC ISBN 0 580 2059
3、8 3 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Information Systems Technology Standards Policy Committee (IST/-) to Technical Committee IST/4, upon which the following bodies were represented: British Computer Society Her Majestys Sta
4、tionery Office ICI Imagedata Institution of Electrical Engineers International Computers Ltd. Kodak Ltd. National Computer Users Forum Amendments issued since publication Amd. No. Date CommentsBSISO/IEC10777:1991 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword
5、 ii Foreword viii Text of ISO/IEC10777 1BSISO/IEC10777:1991 ii BSI 03-2000 National foreword This BritishStandard reproduces verbatim ISO/IEC10777:1991 and implements it as the UK national standard. This BritishStandard is published under the direction of the Information Systems Technology Standards
6、 Policy Committee whose Technical Committee IST/4 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European d
7、evelopments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Users of
8、British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO/IEC title page, pagesiitoviii, pages1 to8
9、3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO/IEC10777:1991(E) ii BSI 03-2000 Contents Page Foreword viii Introduction 1 Section 1. General 1 Scope 1 2 Conf
10、ormance 1 2.1 Magnetic tape cartridge 1 2.2 Generating system 1 2.3 Receiving system 1 3 Normative references 1 4 Definitions 2 4.1 Absolute Frame Number (AFN) 2 4.2 automatic track finding (ATF) 2 4.3 Area ID 2 4.4 Average Signal Amplitude 2 4.5 azimuth 2 4.6 back surface 2 4.7 byte 2 4.8 cartridge
11、 2 4.9 Channel bit 2 4.10 Data Format ID 2 4.11 Early Warning Point (EWP) 2 4.12 End of Data (EOD) 2 4.13 Error Correcting Code (ECC) 2 4.14 flux transition position 2 4.15 flux transition spacing 3 4.16 frame 3 4.17 housekeeping frame 3 4.18 Logical Beginning of Tape (LBOT) 3 4.19 magnetic tape 3 4
12、.20 Master Standard Amplitude Calibration Tape 3 4.21 Master Standard Reference Tape 3 4.22 Optimum Recording Field 3 4.23 Partition boundary 3 4.24 Physical Beginning of Tape (PBOT) 3 4.25 Physical End of Tape (PEOT) 3 4.26 physical recording density 3 4.27 pre-recording condition 3 4.28 record 4 4
13、.29 Reference Recording Field 4 4.30 Secondary Standard Amplitude Calibration Tape 4 4.31 Secondary Standard Reference Tape 4 4.32 separator 4 4.33 Standard Reference Amplitude 4 4.34 Tape Reference Edge 4 4.35 Test Recording Current 4 4.36 track 4 4.37 Virtual End of Tape (VEOT) 4 5 Environment and
14、 safety 4 5.1 Testing environment 4 5.2 Operating environment 5ISO/IEC10777:1991(E) BSI 03-2000 iii Page 5.3 Storage environment 5 5.4 Transportation 5 5.5 Safety 5 5.6 Flammability 5 Section 2. Requirements for the case 6 Dimensional and mechanical characteristics of the case 5 6.1 General 5 6.2 Ov
15、erall dimensions (Figure6 and Figure 7) 6 6.3 Loading grip (Figure6) 6 6.4 Holding areas (Figure6) 6 6.5 Notches of the lid (Figure5 and Figure8) 6 6.6 Lid dimensions (Figure6 to Figure8) 7 6.7 Optical detection of the Beginning and End of Tape (Figure 9 and Figure 12) 7 6.8 Bottom side (Figure 10 a
16、nd Figure 11) 8 6.8.1 Locking mechanism of the slider 8 6.8.2 Access holes 8 6.8.3 Recognition, Sub-datums, and Write-inhibit Holes 8 6.8.4 Datum Holes 10 6.8.5 Access room for tape guides 10 6.8.6 Holes for accessing the hubs 10 6.8.7 Internal structure of the lower half (Figure 12) 10 6.8.8 Light
17、path (Figure 12) 11 6.8.9 Support Areas (Figure 13) 12 6.8.10 Datum Areas (Figure 13) 12 6.8.11 Relationship between Support and Datum Areas and Reference PlaneZ (Figure 14) 12 6.9 Hubs (Figure 15, Figure 16) 12 6.10 Leader and trailer attachment 12 6.11 Interface between the hubs and the drive spin
18、dles (Figure 17) 13 6.12 Opening of the lid (Figure 18) 13 6.13 Release of the hub locking mechanism (Figure 19, Figure 20) 13 6.14 Label areas (Figure 21, Figure 22) 13 Section 3. Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristics of the tape 24 7.1 Material
19、s 24 7.2 Tape length 24 7.2.1 Length of magnetic tape 24 7.2.2 Length of leader and trailer tapes 24 7.3 Tape width 24 7.4 Discontinuities 24 7.5 Total thickness 24 7.6 Longitudinal curvature 24 7.7 Cupping 24 7.8 Coating adhesion 25 7.9 Layer-to-layer adhesion 25 7.10 Tensile strength 25 7.10.1 Bre
20、aking strength 26ISO/IEC10777:1991(E) iv BSI 03-2000 Page 7.10.2 Yield strength 26 7.11 Residual elongation 26 7.12 Electrical resistance of coated surfaces 26 7.13 Light transmittance of the tape 27 8 Magnetic recording characteristics 27 8.1 Optimum Recording Field 27 8.2 Signal amplitude 28 8.3 R
21、esolution 28 8.4 Overwrite 28 8.4.1 Physical recording densities of750,6ftpmm and3002ftpmm 28 8.4.2 Physical recording densities of83,4ftpmm and 1001ftpmm 28 8.5 Ease of erasure 28 8.6 Tape quality 29 8.6.1 Missing pulses 29 8.6.2 Missing pulse zone 29 8.7 Signal-to-noise ratio (S/N) characteristic
22、29 Section 4. Requirements for an interchanged tape 9 Format 29 9.1 General 29 9.2 Basic Groups 29 9.2.1 Group Information Table 30 9.2.2 Block Access Table 31 9.3 Sub-Groups 34 9.3.1 G1 Sub-Group 34 9.3.2 G2 Sub-Group Randomizing 34 9.3.3 G3 Sub-Group 34 9.3.4 G4 Sub-Group 36 9.3.5 Main Data Block
23、40 9.4 Sub Data Area 41 9.4.1 Pack Item No.1 42 9.4.2 Pack Item No.2 42 9.4.3 Pack Item No.3 43 9.4.4 Pack Item No.4 44 9.4.5 Pack Item No.5 45 9.4.6 Pack Item No.6 46 9.4.7 Pack Item No.7 46 9.4.8 Pack Item No.8 47 9.4.9 Sub Data Block 47 10 Method of recording 50 10.1 Physical recording density 50
24、 10.2 Long-term average bit cell length 50 10.3 Short-term average bit cell length 50 10.4 Rate of change 50 10.5 Bit shift 51 10.6 Read signal amplitude 51 10.7 Maximum recorded levels 51 11 Track geometry 51 11.1 Track configuration 51ISO/IEC10777:1991(E) BSI 03-2000 v Page 11.2 Average track pitc
25、h 52 11.3 Variations of the track pitch 52 11.4 Track width 52 11.5 Track angle 52 11.6 Track edge linearity 52 11.7 Track length 53 11.8 Ideal tape centreline 53 11.9 Azimuth angles 53 12 Recording of blocks on the tape 53 12.1 Recorded Main Data Block 53 12.2 Recorded Sub Data Block 53 12.3 Margin
26、 Blocks, Preamble Blocks and Postamble Blocks 53 12.4 Spacer Blocks 53 13 Format of a track 53 13.1 Track capacity 53 13.2 Positioning accuracy 54 13.3 Tracking scheme 54 14 Layout of a Single Data Space tape 57 14.1 Device Area 57 14.2 Reference Area 57 14.3 Position Tolerance Band No.1 58 14.4 Sys
27、tem Area 58 14.4.1 System Preamble 58 14.4.2 System Log 58 14.4.3 System Postamble 58 14.4.4 Position Tolerance Band No.2 58 14.4.5 Vendor Group Preamble 58 14.5 Data Area 58 14.5.1 Vendor Group 58 14.5.2 Recorded Data Group 58 14.5.3 ECC3 59 14.5.4 Multiple recorded instances 59 14.5.5 Repeated fra
28、mes 60 14.5.6 Appending and overwriting 60 14.6 EOD Area 61 14.7 Post-EOD Area 62 14.8 Early Warning Point EWP 62 14.9 Initialization 62 15 Layout of a Partitioned tape 62 15.1 Overall magnetic tape layout 63 15.1.1 Device Area 63 15.1.2 Partition1 63 15.1.3 Partition0 64 15.2 Area ID 64 15.3 System
29、 Area Pack Items No.3 and No.4 64 15.4 Empty Partition 64 15.5 Initialization of Partitioned Tapes 65 16 Housekeeping frames 65ISO/IEC10777:1991(E) vi BSI 03-2000 Page 16.1 Amble Frames 65 16.2 System Log Frames 65 16.3 Tape Management Frames 65 Annex A (normative) Measurement of the light transmitt
30、ance of the prisms 66 Annex B (informative) Recognition Holes 67 Annex C (informative) Means to open the lid 67 Annex D (normative) Measurement of light transmittance of tape and leaders 69 Annex E (normative) Measurement of Signal-to-Noise Ratio 71 Annex F (normative) Method for determining the nom
31、inal and the maximumallowable recorded levels 71 Annex G (normative) Representation of8-bit bytes by10-bit patterns 72 Annex H (normative) Measurement of bit shift 79 Annex J (informative) Recommendations for transportation 80 Annex K (normative) Method of measuring track edge linearity 81 Annex L (
32、informative) Read-After-Write 82 Annex M (informative) Example of the content of a Basic Group No.0 83 Figure 1 Top view 14 Figure 2 Bottom view 14 Figure 3 Partial view of the rear side 14 Figure 4 Reference PlanesX,Y,Z 14 Figure 5 Front side, lid closed 15 Figure 6 Top side, lid closed 15 Figure 7
33、 Left side, lid closed 15 Figure 8 Top side, lid open 16 Figure 9 Left side, lid open 16 Figure 10 Bottom side, lid closed 17 Figure 11 Bottom side, lid open 18 Figure 12 Inside view of the lower half 19 Figure 13 Bottom side, lid and slider in open position 20 Figure 14 Left side, lid open 20 Figur
34、e 15 Top view of a hub 21 Figure 16 Side view of a hub 21 Figure 17 Interface with the drive spindle 21 Figure 18 Lid in completely open position 22 Figure 19 Extreme position of the lid for which the hubs are still locked 22 Figure 20 Minimum position of the lid for which the hubs are completelyunl
35、ocked 23 Figure 21 Top side, label area 23 Figure 22 Rear side, label area 24 Figure 23 Setup for measuring coating adhesion 25 Figure 24 Setup for measuring the electrical resistance 27 Figure 25 Structure of a Basic Group 30 Figure 26 Block Access Table 31 Figure 27 G1 Sub-Groups 34 Figure 28 Shif
36、t Register 34 Figure 29 G3 Sub-Group 35ISO/IEC10777:1991(E) BSI 03-2000 vii Page Figure 30 Twin arrays of a G4 Sub-Group before C1 and C2 computation 37 Figure 31 W1 byte 40 Figure 32 W2 byte 40 Figure 33 Main Data Block 41 Figure 34 Pack Item No.1 42 Figure 35 Pack Item No.2 42 Figure 36 Pack Item
37、No.3 43 Figure 37 Pack Item No.4 44 Figure 38 Pack Item No.5 45 Figure 39 Pack Item No.6 46 Figure 40 Pack Item No.7 46 Figure 41 Pack Item No.8 47 Figure 42 SW1 Byte 48 Figure 43 SW2 Byte 48 Figure 44 Sub Data Block 49 Figure 45 Track configuration (view on recording surface) 52 Figure 46 ATF signa
38、ls allocation 56 Figure 47 Layout of a Single Data Space tape 57 Figure 48 Appending rules 60 Figure 49 Tolerance on seamless appending 61 Figure 50 Layout of a Partitioned tape 63 Figure A.1 Reference Prism 66 Figure A.2 Cartridge Prism 66 Figure A.3 Perspective view of the Reference Prism 67 Figur
39、e C.1 Bottom side of the case 68 Figure C.2 Intermediate position within the drive 68 Figure C.3 Final position within the drive 68 Figure D.1 Optical arrangement 70 Figure D.2 Measuring circuitry 70 Figure K.1 Track edge linearity 81 Figure M.1 Example of a Basic Group No.0 83 Table 1 Group Informa
40、tion Table 30 Table 2 Valid Sequences of Entries in the Block Access Table 33 Table 3 Pack Item Location 50 Table 4 Format of a track 54 Table B.1 Recognition Holes 67 Descriptors: Data processing, information interchange, data recording, magnetic recording, data storage devices, magnetic tapes, mag
41、netic tape cartridges, specifications, dimensions, formats, interchangeability.ISO/IEC10777:1991(E) viii BSI 03-2000 Foreword ISO (the International Organization for Standardization) and IEC (theInternational Electrotechnical Commission) form the specialized system for worldwide standardization. Nat
42、ional bodies that are members of ISO or IEC participate in the development of International Standards 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 interes
43、t. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC1. Draft International Standards adopted by the joint technic
44、al committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least75%of the national bodies casting a vote. International Standard ISO/IEC10777 was prepared by the European Computer Manufacturers Association (as Standard ECMA-139) and wa
45、s adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC1, Information technology, in parallel with its approval by national bodies of ISO and IEC. Annex A, Annex D to Annex H and Annex K form an integral part of this International Standard. Annex B, Annex C, Annex
46、 J, Annex L and Annex M are for information only. Patents During the preparation of the ECMA standard, information was gathered on patents upon which application of the standard might depend. Relevant patents were identified as belonging to Hewlett Packard Limited and the Sony Corporation. However,
47、neither ECMA, nor ISO/IEC can give authoritative or comprehensive information about evidence, validity or scope of patent and like rights. The patent holders have stated that licences will be granted under reasonable and non-discriminatory terms. Communications on this subject should be addressed to
48、 Hewlett Packard Limited Computer Peripherals Bristol Filton road Stoke Gifford Bristol BS126Q2 United Kingdom Sony Corporation Licensing and Trademark Division 6-7-35 Kitashinagawa Shinagawa-ku Tokyo141 JapanISO/IEC10777:1991(E) BSI 03-2000 1 Introduction This International Standard specifies the c
49、haracteristics of a3,81mm wide magnetic tape cartridge to enable interchangeability of such cartridges. The format used is known as Digital Data Storage (DDS). Section 1. General 1 Scope This International Standard specifies the physical and magnetic characteristics of such cartridges. It also specifies the quality of the recorded signal, the format and the recording method, thereby allowing data interchange by means of such magneti
