1、BRITISH STANDARD BS ISO/IEC 12247:1993 Implementation of ISO/IEC12247:1993 Information technology 3,81mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format using60m and90m length tapes UDC 681.327.636BSISO/IEC12247:1993 This BritishStandard, having been prepar
2、ed under the directionof the Information Systems Technology StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15April1994 BSI02-2000 The following BSI references relate to the work on this standard: Committee referenceIST/4 Draft for comment92/
3、66915DC ISBN 0 580 23307 3 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Information Systems Technology Standards Policy Committee(IST/-) to Technical CommitteeIST/4, upon which the following bodies were represented: British Computer Soc
4、iety ICI Imagedata Institute of Quality Assurance Institution of Electrical Engineers International Computers Limited Kodak Limited Amendments issued since publication Amd. No. Date CommentsBSISO/IEC12247:1993 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii
5、 Foreword viii Text of ISO/IEC12247 1BSISO/IEC12247:1993 ii BSI 02-2000 National foreword This BritishStandard reproduces verbatim ISO/IEC12247:1993 and implements it as the UK national standard. This BritishStandard is published under the direction of the Information Systems Technology Standards Po
6、licy Committee whose Technical CommitteeIST/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 devel
7、opments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, Publications, BSI, Linford Wood, Milton Keynes, MK146LE. A British Standard does not purport to include all the necessary provisions of a contract. Us
8、ers of 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, pages ii to viii,
9、pages1 to84 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/IEC12247:1993 (E) ii BSI 02-2000 Contents Page Foreword viii Introduction 1 Section 1. General 1 Sco
10、pe 1 2 Conformance 1 2.1 Magnetic tape cartridge 1 2.2 Generating system 2 2.3 Receiving system 2 3 Normative references 2 4 Definitions 2 4.1 Absolute Frame Number (AFN) 2 4.2 Area ID 2 4.3 Automatic Track Finding (ATF) 3 4.4 Average Signal Amplitude 3 4.5 azimuth 3 4.6 back surface 3 4.7 byte 3 4.
11、8 cartridge 3 4.9 Channel Bit 3 4.10 Data Format ID 3 4.11 Early Warning Point (EWP) 3 4.12 End of Data (EOD) 3 4.13 Error Correcting Code (ECC) 3 4.14 flux transition position 3 4.15 flux transition spacing 3 4.16 frame 3 4.17 Housekeeping Frame 4 4.18 Logical Beginning of Tape (LBOT) 4 4.19 magnet
12、ic tape 4 4.20 Master Standard Amplitude Calibration Tape 4 4.21 Master Standard Reference Tape 4 4.22 Optimum Recording Field 4 4.23 partition boundary 4 4.24 Physical Beginning of Tape (PBOT) 4 4.25 Physical End of Tape (PEOT) 4 4.26 physical recording density 4 4.27 pre-recording condition 4 4.28
13、 record 4 4.29 Reference Recording Field 4 4.30 Secondary Standard Amplitude Calibration Tape 5 4.31 Secondary Standard Reference Tape 5 4.32 Separator Mark 5 4.33 Standard Reference Amplitude 5 4.34 Tape Reference Edge 5 4.35 Test Recording Current 5 4.36 track 5 4.37 Virtual End of Tape (VEOT) 5 5
14、 Environment and safety 5 5.1 Testing environment 5 5.2 Operating environment 5ISO/IEC12247:1993 (E) BSI 02-2000 iii Page 5.3 Storage environment 6 5.4 Transportation 6 5.5 Safety 6 5.6 Flammability 6 Section 2. Requirements for the case 6 Dimensional and mechanical characteristics of the case 6 6.1
15、 General 6 6.2 Overall dimensions 7 6.3 Loading grip 7 6.4 Holding areas 7 6.5 Notches of the lid 7 6.6 Lid dimensions 8 6.7 Optical detection of the beginning and end of tape 8 6.8 Bottom side 9 6.8.1 Locking mechanism of the slider 9 6.8.2 Access Holes 9 6.8.3 Recognition, Sub-datums, and Write-in
16、hibit Holes 10 6.8.4 Datum Holes 11 6.8.5 Access room for tape guides 11 6.8.6 Holes for accessing the hubs 12 6.8.7 Internal structure of the lower half 12 6.8.8 Light path 13 6.8.9 Support Areas 13 6.8.10 Datum Areas 13 6.8.11 Relationship between Support and Datum Areas and Reference Plane Z 13 6
17、.9 Hubs 14 6.10 Leader and trailer attachment 14 6.11 Interface between the hubs and the drive spindles 14 6.12 Opening of the lid 14 6.13 Release of the hub locking mechanism 14 6.14 Label areas 15 Section 3. Requirements for the unrecorded tape 7 Mechanical, physical and dimensional characteristic
18、s of the tape 25 7.1 Materials 25 7.2 Tape length 26 7.2.1 Length of magnetic tape 26 7.2.2 Length of leader and trailer tapes 26 7.2.3 Length of splicing tapes 26 7.3 Tape width 26 7.3.1 Width of magnetic, leader and trailer tapes 26 7.3.2 Width and position of splicing tape 26 7.4 Discontinuities
19、26 7.5 Total thickness 26 7.6 Longitudinal curvature 26 7.7 Cupping 26 7.8 Coating adhesion 27 7.9 Layer-to-layer adhesion 27ISO/IEC12247:1993 (E) iv BSI 02-2000 Page 7.10 Tensile strength 27 7.10.1 Breaking strength 27 7.10.2 Yield strength 28 7.11 Residual elongation 28 7.12 Electrical resistance
20、of coated surfaces 28 7.13 Light transmittance of the tape 29 8 Magnetic recording characteristics 29 8.1 Optimum Recording Field 29 8.2 Signal amplitude 29 8.3 Resolution 29 8.4 Overwrite 30 8.4.1 Physical recording densities of750,6ftpmm and3002ftpmm 30 8.4.2 Physical recording densities of83,4ftp
21、mm and1001ftpmm 30 8.5 Ease of erasure 30 8.6 Tape quality 30 8.6.1 Missing pulses 30 8.6.2 Missing pulse zone 30 8.7 Signal-to-noise ratio (S/N) characteristic 30 Section 4. Requirements for an interchanged tape 9 Format 31 9.1 General 31 9.2 Basic Groups 31 9.2.1 Group Information Table 32 9.2.2 B
22、lock Access Table 33 9.3 Sub-Groups 36 9.3.1 G1 Sub-Group 36 9.3.2 G2 Sub-Group randomizing 36 9.3.3 G3 Sub-Group 36 9.3.4 G4 Sub-Group 38 9.3.5 Main Data Block 42 9.4 Sub Data Area 43 9.4.1 Pack Item No.1 44 9.4.2 Pack Item No.2 44 9.4.3 Pack Item No.3 45 9.4.4 Pack Item No.4 46 9.4.5 Pack Item No.
23、5 47 9.4.6 Pack Item No.6 47 9.4.7 Pack Item No.7 48 9.4.8 Pack Item No.8 48 9.4.9 Sub Data Block 49 10 Method of recording 52 10.1 Physical recording density 52 10.2 Long-term average bit cell length 52 10.3 Short-term average bit cell length 52 10.4 Rate of change 52 10.5 Bit shift 52 10.6 Read si
24、gnal amplitude 52 10.7 Maximum recorded levels 52ISO/IEC12247:1993 (E) BSI 02-2000 v Page 11 Track geometry 52 11.1 Track configuration 52 11.2 Average track pitch 53 11.3 Variations of the track pitch 53 11.4 Track width 53 11.5 Track angle 53 11.6 Track edge linearity 53 11.7 Track length 54 11.8
25、Ideal tape centreline 54 11.9 Azimuth angles 54 12 Recording of blocks on the tape 54 12.1 Recorded Main Data Block 54 12.2 Recorded Sub Data Block 54 12.3 Margin Blocks, Preamble Blocks and Postamble Blocks 54 12.4 Spacer Blocks 54 13 Format of a track 54 13.1 Track capacity 54 13.2 Positioning acc
26、uracy 55 13.3 Tracking scheme 55 14 Layout of a Single Data Space tape 58 14.1 Device Area 58 14.2 Reference Area 59 14.3 Position Tolerance Band No.1 59 14.4 System Area 59 14.4.1 System Preamble 59 14.4.2 System Log 59 14.4.3 System Postamble 59 14.4.4 Position Tolerance Band No.2 59 14.4.5 Vendor
27、 Group Preamble 59 14.5 Data Area 59 14.5.1 Vendor Group 59 14.5.2 Recorded Data Group 60 14.5.3 ECC3 60 14.5.4 Multiple recorded instances 61 14.5.5 Repeated frames 61 14.5.6 Appending and overwriting 61 14.6 EOD Area 63 14.7 Post-EOD Area 63 14.8 Early Warning Point EWP 63 14.9 Initialization 63 1
28、5 Layout of a partitioned tape 63 15.1 Overall magnetic tape layout 64 15.1.1 Device Area 64 15.1.2 Partition1 64 15.1.3 Partition0 65 15.2 Area ID 65 15.3 System Area Pack Items No.3 and No.4 65 15.4 Empty partitions 65ISO/IEC12247:1993 (E) vi BSI 02-2000 Page 15.5 Initialization of partitioned tap
29、es 66 16 Housekeeping Frames 66 16.1 Amble Frames 66 16.2 System Log Frames 66 16.3 Tape Management Frames 66 Annex A (normative) Measurement of the light transmittance of the prisms 67 Annex B (informative) Recognition Holes 68 Annex C (informative) Means to open the lid 69 Annex D (normative) Meas
30、urement of light transmittance of tape and leaders 70 Annex E (normative) Measurement of Signal-to-Noise Ratio 72 Annex F (normative) Method for determining the nominal and the maximum allowable recorded levels 72 Annex G (normative) Representation of8-bit bytes by10-bit patterns 73 Annex H (normati
31、ve) Measurement of bit shift 79 Annex J (informative) Recommendations for transportation 81 Annex K (normative) Method of measuring track edge linearity 81 Annex L (informative) Read-After-Write 82 Annex M (informative) Example of the content of a Basic Group No.0 83 Annex N (informative) Media Reco
32、gnition System (MRS) 83 Figure 1 Top view 16 Figure 2 Bottom view 16 Figure 3 Partial view of the rear side 16 Figure 4 Reference Planes X, Y, Z 16 Figure 5 Front side, lid closed 17 Figure 6 Top side, lid closed 17 Figure 7 Left side, lid closed 17 Figure 8 Top side, lid open 18 Figure 9 Left side,
33、 lid open 18 Figure 10 Bottom side, lid closed 19 Figure 11 Bottom side, lid open 20 Figure 12 Inside view of the lower half 21 Figure 13 Bottom side, lid and slider in open position 22 Figure 14 Left side, lid open 22 Figure 15 Top view of a hub 23 Figure 16 Side view of a hub 23 Figure 17 Interfac
34、e with the drive spindle 23 Figure 18 Lid in completely open position 24 Figure 19 Extreme position of the lid for which the hubs are still locked 24 Figure 20 Minimum position of the lid for which the hubs are completely unlocked 24 Figure 21 Top side, label area 25 Figure 22 Rear side, label area
35、25 Figure 23 Setup for measuring coating adhesion 27 Figure 24 Setup for measuring the electrical resistance 28 Figure 25 Structure of a Basic Group 31 Figure 26 Block Access Table 33 Figure 27 G1 Sub-Groups 36 Figure 28 Shift register 36ISO/IEC12247:1993 (E) BSI 02-2000 vii Page Figure 29 G3 Sub-Gr
36、oup 37 Figure 30 Twin arrays of a G4 Sub-Group before C1 and C2 computation 39 Figure 31 W1 byte 42 Figure 32 W2 byte 42 Figure 33 Main Data Block 43 Figure 34 Pack Item No.1 44 Figure 35 Pack Item No.2 44 Figure 36 Pack Item No.3 45 Figure 37 Pack Item No.4 46 Figure 38 Pack Item No.5 47 Figure 39
37、Pack Item No.6 47 Figure 40 Pack Item No.7 48 Figure 41 Pack Item No.8 48 Figure 42 SW1 Byte 49 Figure 43 SW2 Byte 50 Figure 44 Sub Data Block 50 Figure 45 Track configuration (view on recording surface) 53 Figure 46 ATF signals allocation 57 Figure 47 Layout of a Single Data Space tape 58 Figure 48
38、 Appending rules 61 Figure 49 Tolerance on seamless appending 62 Figure 50 Layout of a partitioned tape 64 Figure A.1 Reference prism 67 Figure A.2 Cartridge prism 67 Figure A.3 Perspective view of the reference prism 68 Figure C.1 Bottom side of the case 69 Figure C.2 Intermediate position within t
39、he drive 69 Figure C.3 Final position within the drive 70 Figure D.1 Optical arrangement 71 Figure D.2 Measuring circuitry 72 Figure K.1 Track edge linearity 82 Figure M.1 Example of a Basic Group No.0 83 Figure N.1 Splicing tape at PBOT 84 Table 1 Group Information Table 32 Table 2 Valid sequences
40、of entries in the Block Access Table 35 Table 3 Pack Item Location 51 Table 4 Format of a track 55 Table B.1 Recognition Holes 68 Descriptors: Data processing, information interchange, data recording, magnetic recording, data storage devices, magnetic tapes, 3,81mm magnetic tapes, magnetic tape cart
41、ridges, specifications, dimensions, physical properties, magnetic properties, track formats.ISO/IEC12247:1993 (E) viii BSI 02-2000 Foreword ISO (the International Organization for Standardization) and IEC (theInternational Electrotechnical Commission) form the specialized system for worldwide standa
42、rdization. National 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
43、mutual interest. 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
44、 joint technical 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/IEC12247 was prepared by the European Computer Manufacturers Association (ECMA) (as Sta
45、ndard ECMA-170) and was 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, Annex E, Annex F, Annex G, Annex H andAnnex K form an integral part of this I
46、nternational Standard. Annex B, Annex C, Annex J, Annex L, Annex M andAnnex N are for information only.ISO/IEC12247:1993 (E) BSI 02-2000 1 Introduction ISO/IEC have produced a series of International Standards for cassettes and cartridges containing magnetic tapes of different width and characterist
47、ics. Of these, the following relate to helical scan recording. ISO/IEC10777:1991, Information technology 3,81mm wide magnetic tape cartridge for information interchange Helical scan recording DDS format. ISO/IEC11319:1993, Information technology 8mm wide magnetic tape cartridge for information inter
48、change Helical scan recording. ISO/IEC11321:1992, Information technology 3,81 wide magnetic tape cartridge for information interchange Helical scan recording DATA/DAT format. ISO/IEC11557:1992, Information technology 3,81 wide magnetic tape cartridge for information interchange Helical scan recordin
49、g DDS-DC format using60m and90m length tapes. ISO/IEC12246:1993, Information technology 8mm wide magnetic tape cartridge dual azimuth format for information interchange Helical scan recording. ISO/IEC12248:1993, Information technology 3,81 wide magnetic tape cartridge for information interchange Helical scan recording DATA/DAT-DC format using60m and90 length tapes. This International Standard is a further Internatio
