1、BRITISH STANDARD BS EN ISO/IEC 9661:1997 Information technology Datainterchange on12,7 mm wide magnetic tape cartridges 18 tracks, 1491 data bytes per millimetre The European Standard EN ISO/IEC 9661:1995 has the status of a British Standard ICS 35.220.20BSENISO/IEC9661:1997 This British Standard, h
2、aving been prepared under the directionof the DISC Board, waspublished under the authorityof the Standards Boardand comes into effect on 15July1997 BSI 03-2000 ISBN 0 580 27748 8 National foreword This British Standard is the English language version of EN ISO/IEC 9661:1995. It is identical with ISO
3、/IEC 9661:1994. It supersedes BS 7062:1989 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/4, Magnetic and optical media for digital data, which has the responsibility to: aid enquirers to understand the text; present to the responsible internatio
4、nal/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secr
5、etary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards E
6、lectronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users 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 Thi
7、s document comprises a front cover, an inside front cover, pagesi andii, theEN ISO/IEC title page, page 2, the ISO/IEC title page, pages ii to viii, pages1 to49 andaback cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the
8、 amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSENISO/IEC9661:1997 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Foreword vii Text of ISO/IEC9661 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM ENISO/IEC
9、 9661 December1995 ICS35.220.20 Supersedes EN 29661:1991 Descriptors: See ISO document English version Information technology Data interchange on12,7mmwide magnetic tape cartridges 18 tracks,1491data bytes per millimetre (ISO/IEC9661:1994) Technologies de linformation Echange de donnes sur cartouche
10、s de bande magntique de 12,7 mm de large 18 pistes, 1491 caractres par millimtre (ISO/IEC 9661:1994) This European Standard was approved by CEN on1995-11-30. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
11、 status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German).
12、 A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germa
13、ny, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rig
14、hts of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 29661:1995 EENISO/IEC9661:1995 BSI 03-2000 2 Foreword The text of the International Standard from ISO/IEC/JTC 1 “Information Technology” of the International Organization
15、for Standardization (ISO) and the International Electrotechnical Commission (IEC) has been taken over as a European Standard by CEN Technical Board. This European Standard replaces EN 29661:1991. This European Standard shall be given the status of a national standard, either by publication of an ide
16、ntical text or by endorsement, at the latest by June1996, and conflicting national standards shall be withdrawn at the latest by June1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, Fra
17、nce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Endorsement notice The text of the International Standard ISO/IEC 9661:1994 has been approved by CEN as a European Standard without any modification.ENISO/IEC96
18、61:1995 ii BSI 03-2000 Contents Page Foreword vii Section 1. General 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 1 4.1 Average signal amplitude 1 4.2 Back surface 1 4.3 Beginning of Tape (BOT) 1 4.4 Byte 1 4.5 Cartridge 1 4.6 Cyclic Redundancy Check character 1 4.7 Data density
19、2 4.8 Error Correcting Code 2 4.9 Flux transition position 2 4.10 Flux transition spacing 2 4.11 Magnetic tape 2 4.12 Master Standard Reference Tape 2 4.13 Physical recording density 2 4.14 Postamble 2 4.15 Preamble 2 4.16 Reference field 2 4.17 Secondary Standard Reference Tape 2 4.18 Standard refe
20、rence amplitude 2 4.19 Standard reference current 3 4.20 Test recording current 3 4.21 Track 3 4.22 Typical field 3 5 Environment and safety 3 5.1 Cartridge/Tape testing environment 3 5.2 Cartridge operation environment 3 5.3 Cartridge storage environment 3 5.4 Safety requirements 3 5.4.1 Safety 3 5
21、.4.2 Flammability 3 5.5 Transportation 4 Section 2. Tape requirements 6 Characteristics of the tape 4 6.1 Material 4 6.2 Tape length 4 6.3 Tape width 4 6.4 Tape discontinuity 4 6.5 Total thickness of tape 4 6.6 Base material thickness 4 6.7 Longitudinal curvature 4 6.8 Out-of-plane distortions 4 6.9
22、 Cupping 4 6.10 Dynamic frictional characteristics 4 6.10.1 Frictional drag between the recording surface and the tape back surface 4ENISO/IEC9661:1995 BSI 03-2000 iii Page 6.10.2 Frictional drag between the tape recording surface and ferrite after environmental cycling 5 6.11 Coating adhesion 5 6.1
23、2 Flexural rigidity 6 6.13 Electrical resistance of coated surfaces 6 6.14 Tape durability 7 6.15 Inhibitor tape 7 6.16 Tape abrasivity 7 6.17 Pre-recording condition 7 6.18 Magnetic recording characteristics 7 6.18.1 Typical field 8 6.18.2 Signal amplitude 8 6.18.3 Resolution 8 6.18.4 Overwrite 8 6
24、.18.5 Narrow-Band Signal-to-Noise Ratio (NB-SNR) 8 6.19 Tape quality 9 6.19.1 Missing pulses 9 6.19.2 Missing pulse zones 9 6.19.3 Coincident missing pulse zones 9 Section 3. Cartridge requirements 7 Dimensional and mechanical characteristics of the cartridge 10 7.1 Overall dimensions (Figure 4 toFi
25、gure 6) 10 7.2 Write-inhibit mechanism (Figure 4 andFigure 5) 11 7.3 Label area of the rear side (Figure 5 andFigure 6) 11 7.4 Label area of the top side (Figure 5) 11 7.5 Case opening (Figure 4,Figure 5,Figure 7 andFigure 9) 11 7.6 Locating notches (Figure 7,Figure 8 andFigure 10) 12 7.7 Locating a
26、reas (Figure 7) 12 7.8 Inside configuration of the case around the case opening (Figure 7 andFigure 11) 12 7.9 Other external dimensions of the case (Figure 8) 13 7.10 Central window (Figure 7) 13 7.11 Stacking ribs 13 7.12 Flexibility of the case 13 7.12.1 Requirements 13 7.12.2 Procedure 14 7.13 T
27、ape reel (Figure 12 andFigure 13) 14 7.13.1 Locking mechanism (Figure 13) 14 7.13.2 Axis of rotation of the reel 14 7.13.3 Metallic insert 14 7.13.4 Toothed rim 14 7.13.5 Hub of the reel 14 7.13.6 Relative positions 15 7.13.7 Characteristics of the toothed rim (Figure 12) 15 7.14 Leader block (Figur
28、e 15) 16 7.15 Attachment of the tape to the leader block (Figure 16) 16 7.16 Latching mechanism (Figure 17) 17 7.17 Tape wind 17ENISO/IEC9661:1995 iv BSI 03-2000 Page 7.18 Wind tension 17 7.19 Circumference of the tape reel 17 7.20 Moment of inertia 17 Section 4. Recording requirements 8 Method of r
29、ecording 26 8.1 Physical recording density 26 8.2 Bit cell length 26 8.3 Average bit cell length 26 8.4 Long-term average bit cell length 26 8.5 Short-term average bit cell length 26 8.6 Rate of change 26 8.7 Bit shift 26 8.8 Total character skew 26 8.9 Read signal amplitude 26 8.10 Coincident missi
30、ng pulses 27 9 Track format 27 9.1 Number of tracks 27 9.2 Reference edge 27 9.3 Track positions 27 9.4 Track width 27 9.5 Azimuth 27 10 Data format 27 10.1 Types of bytes 27 10.1.1 Data bytes 27 10.1.2 Pad bytes 29 10.2 Frame 29 10.3 Data Block 29 10.3.1 Prefix 30 10.3.2 Data Frames 30 10.3.3 Resid
31、ual Frame 1 31 10.3.4 Residual Frame 2 31 10.3.5 Summary of requirements for Residual Frames 33 10.3.6 Suffix 33 10.4 Error Correcting Code (ECC) 33 10.4.1 Diagonal Redundancy Check (DRC) 34 10.4.2 Vertical Redundancy Check (VRC) 34 10.4.3 ECC Format 34 10.4.4 Summary of ECC 35 10.5 Recording of 8-b
32、it bytes on the tape 36 10.6 Recorded Data Block 36 10.6.1 Preamble 36 10.6.2 Beginning of Data Mark (BDM) 36 10.6.3 Resync Control Frame 36 10.6.4 End of Data Mark (EDM) 36 10.6.5 Postamble 36 10.7 Data density 36 11 Tape format 37 11.1 Density Identification Burst 37 11.2 ID Separator Burst 38ENIS
33、O/IEC9661:1995 BSI 03-2000 v Page 11.3 Interblock Gaps 38 11.4 Erase Gaps 38 11.4.1 Normal Erase Gaps 38 11.4.2 Elongated Erase Gaps 38 11.5 Tape Marks 39 11.6 Relationship between Interblock Gaps, Erase Gaps and Tape Marks 39 11.6.1 Interblock Gap followed by a Tape Mark 39 11.6.2 Tape Mark followe
34、d by an Interblock Gap 39 11.6.3 Interblock Gap followed by an Erase Gap 39 11.6.4 Erase Gap followed by an Interblock Gap 39 11.6.5 Summary of the relationship between Interblock Gaps, Erase Gaps and Tape Marks 40 11.7 First and last recording on the tape 40 11.8 Summary of the tape format 41 11.8.
35、1 Characteristics of recording other than recorded Data Blocks 41 11.8.2 Arrangement of recording on the tape 41 Annex A (informative) Recommendations for transportation 42 Annex B (informative) Inhibitor tape 42 Annex C (normative) Tape abrasivity measurement procedure 43 Annex D (informative) Reco
36、mmendations on tape durability 45 Annex E (normative) Pre-recording condition 45 Annex F (normative) Representation of 8-bit bytes by 9-bit patterns 46 Annex G (normative) Measurement of bit shift 48 Figure 1 Coating adhesion 6 Figure 2 Position of test piece over two semi-circular electrodes 7 Figu
37、re 3 Cartridge 18 Figure 4 Front side of case 19 Figure 5 Top side of case 19 Figure 6 Rear side of case 19 Figure 7 Bottom side of case 20 Figure 8 Side of case 20 Figure 9 Enlarged view 21 Figure 10 Cross-section of a location notch 21 Figure 11 Cross-section of a detail of the opening of case 22
38、Figure 12 Cross-section of the cartridge in hand 22 Figure 13 Cross-section of the cartridge in the drive 23 Figure 14 Teeth of the toothed rim 23 Figure 15 Cross-section of leader block 24 Figure 16 Fixation of tape to leader block 25 Figure 17 Leader block in case 25 Figure 18 Rate of change 26 Fi
39、gure 19 Frame 29 Figure 20 Data Frame 30 Figure 21 Data Block 31 Figure 22 Residual Frame 1 31 Figure 23 Residual Frame 2 32 Figure 24 Summary of ECC 35ENISO/IEC9661:1995 vi BSI 03-2000 Page Figure 25 Recorded Data Block 36 Figure 26 Zones 37 Figure 27 Summary of the relationship between Gaps and Ta
40、pe Marks 40 Figure 28 Recordings other than recorded Data Blocks 41 Figure 29 Tape layout 41 Figure C.1 Ferrite Wear Bar 43 Figure C.2 Wear Bar Holding Fixture 44 Figure C.3 Typical Wear Pattern. Ferrite Bar following abrasivity test illustrating three locations for wear length measurement (the amou
41、nt of wear is exaggerated for clarity) 44 Table 1 7-bit coding 28 Table 2 8-bit coding 28 Table 3 Block-ID bytes 29 Table 4 CRC bytes 33 Table 5 Requirements for Residual Frames 33 Descriptors: Data processing, information interchange, data recording devices, magnetic tapes, half-inch magnetic tapes
42、, magnetic tape cartridges, specifications, dimensions, mechanical properties, physical properties, magnetic properties, formats, track formats, interchangeability.ENISO/IEC9661:1995 BSI 03-2000 vii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrot
43、echnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participation in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technic
44、al activity. ISO and IEC technical committees collaborate in fields of 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 technica
45、l committee, ISO/IEC JTC 1. 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 least75% of the national bodies casting a vote. International Standard ISO/IEC 9661 was pr
46、epared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 11, Flexible magnetic media for digital data interchange. This second edition cancels and replaces the first edition (ISO 9661:1988). Annex C,Annex E,Annex F andAnnex G form an integral part of this Internatio
47、nal Standard. Annex A,Annex B,Annex D andAnnex H are for information only.viii blankENISO/IEC9661:1995 BSI 03-2000 1 Section 1. General 1 Scope This International Standard specifies the physical and magnetic characteristics of a12,7mm wide,18-track magnetic tape cartridge to enable interchangeabilit
48、y of such cartridges. It also specifies the quality of the recorded signals, the format and recording method thus allowing, together with ISO1001 for magnetic, tape labelling, full data interchange by means of such magnetic tape cartridges. 2 Conformance A magnetic tape cartridge shall be in conform
49、ance with this International Standard if it meets all mandatory requirements specified herein. The tape requirements shall be satisfied throughout the extent of the tape. 3 Normative references The following 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 Inter
