1、BRITISH STANDARD BS ISO/IEC 13421:1993 Implementation of ISO/IEC 13421:1993 Information technology Datainterchange on12,7mm,48-track magnetic tape cartridges DLT1format UDC 681.327.636BSISO/IEC13421:1993 This British Standard, having been prepared under the directionof the Information Systems Techno
2、logy Standards Policy Committee, was publishedunder the authority ofthe Standards Board and comesinto effect on 15April1994 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 93/650775DC ISBN 0 580 23304 9 Committees responsible
3、for this British Standard The preparation of this British Standard 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 ICI Imagedata Institute of Quality Assura
4、nce Institution of Electrical Engineers International Computers Limited Kodak Limited Amendments issued since publication Amd. No. Date CommentsBSISO/IEC13421:1993 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword vii Text of ISO/IEC 13421 1BSISO/IEC
5、13421:1993 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO/IEC13421:1993and implements it as the UK national standard. This British Standard is published under the direction of the Information Systems Technology Standards Policy Committee whose Technical CommitteeIST/4
6、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 developments and promulgate them in the UK. NOTEInt
7、ernational 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. Users of British Standards are responsible for t
8、heir 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, pages i and ii, theISO/IEC title page, pages ii to viii, pages1to 40 and abackover. This standard has
9、 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/IEC13421:1993(E) ii BSI 01-2000 Contents Page Foreword vii Section 1. General Introduction 1 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridges
10、 1 2.2 Generating systems 1 2.3 Receiving systems 1 3 References 1 4 Definitions 1 4.1 Average Signal Amplitude 1 4.2 azimuth 1 4.3 back surface 1 4.4 Beginning-Of-Tape marker (BOT) 1 4.5 byte 1 4.6 cartridge 1 4.7 Cyclic Redundancy Check (CRC) character 2 4.8 Early Warning (EW) 2 4.9 Error-Detectin
11、g Code (EDC) 2 4.10 End-Of-Tape marker (EOT) 2 4.11 Entity 2 4.12 Error-Correcting Code (ECC) 2 4.13 flux transition position 2 4.14 flux transition spacing 2 4.15 Logical Block 2 4.16 logical track 2 4.17 magnetic tape 2 4.18 Master Standard Reference Tape 2 4.19 object 2 4.20 physical block 2 4.21
12、 physical recording density 2 4.22 physical track 2 4.23 Record 2 4.24 Reference Edge 2 4.25 Reference Field 2 4.26 Secondary Standard Reference Tape 2 4.27 Standard Reference Amplitude (SRA) 2 4.28 Standard Reference Current 3 4.29 Test Recording Current 3 4.30 Typical Field 3 5 Conventions and not
13、ations 3 5.1 Representation of numbers 3 5.2 Names 3 5.3 Acronyms 3 6 Environment and safety 3 6.1 Cartridge and tape testing environment 3 6.2 Cartridge operating environment 3 6.3 Cartridge storage environment 3 6.4 Safety requirements 4ISO/IEC13421:1993(E) BSI 01-2000 iii Page 6.4.1 Safeness 4 6.
14、4.2 Flammability 4 6.5 Transportation 4 Section 2. Requirements for the unrecorded tape 7 Mechanical and electrical requirements 4 7.1 Material 4 7.2 Tape length 4 7.3 Width of the tape 4 7.4 Total thickness of the tape 4 7.5 Thickness of the base material 4 7.6 Thickness of the magnetic coating 4 7
15、.7 Thickness of the back coating 4 7.8 Tape discontinuity 4 7.9 Longitudinal curvature 4 7.9.1 Requirement 4 7.9.2 Procedure 4 7.10 Out-of-Plane distortions 4 7.11 Cupping 4 7.12 Roughness of the coating surfaces 5 7.12.1 Roughness of the back coating surface 5 7.12.2 Roughness of the magnetic coati
16、ng surface 5 7.13 Coating adhesion 5 7.14 Layer-to-layer adhesion 5 7.14.1 Requirements 5 7.14.2 Procedure 5 7.15 Modulus of elasticity 6 7.15.1 Requirement 6 7.15.2 Procedure 6 7.16 Flexural rigidity 6 7.16.1 Requirement 6 7.16.2 Procedure 6 7.17 Tensile yield force 6 7.17.1 Procedure 6 7.18 Electr
17、ical resistance 6 7.18.1 Requirement 6 7.18.2 Procedure 6 7.19 Inhibitor tape 8 7.20 Abrasivity 8 7.20.1 Requirement 8 7.20.2 Procedure 8 7.21 Light transmittance of the tape and the leader 8 7.22 Coefficient of dynamic friction 8 7.22.1 Requirements 8 7.22.2 Procedure for the measurement of the fri
18、ction between the magnetic surface and the back surface 9 7.22.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and calcium titanate ceramic 9ISO/IEC13421:1993(E) iv BSI 01-2000 Page 8 Magnetic recording characteristics 9 8.1 Typical Field 9 8.2 Signal
19、 amplitude 9 8.3 Resolution 9 8.4 Overwrite 10 8.4.1 Requirement 10 8.5 Peak shift 10 8.5.1 Requirement 10 8.5.2 Procedure 10 9 Tape quality 10 9.1 Missing pulses 10 9.1.1 Requirement 10 9.2 Missing pulse zone 10 9.2.1 Requirement 10 9.3 Tape durability 10 Section 3. Mechanical specifications of the
20、 tape cartridge 10 General 11 10.1 Bottom side and right side 11 10.2 Back side and left side 12 10.3 Tape reel 12 10.4 Tape leader 12 10.5 Front side 13 10.6 Operation of the cartridge 13 10.7 Tape winding 14 10.8 Moment of inertia 14 10.9 Material 14 Section 4. Requirements for an interchanged tap
21、e 11 Method of recording 23 11.1 Physical recording density 23 11.2 Bit cell length 23 11.2.1 Average bit cell length 23 11.2.2 Long-term average bit cell length 23 11.2.3 Short-term average bit cell length 23 11.3 Flux transition spacing 24 11.4 Read signal amplitude 24 11.5 Azimuth 24 11.6 Channel
22、 skew 24 12 Tape format 24 12.1 Reference Edge 24 12.2 Direction of recording 24 12.3 Tape layout 24 12.4 Calibration and Directory Area 25 12.4.1 Scratch Area 25 12.4.2 Guard Area G1 25 12.4.3 Calibration Tracks Area 25 12.4.4 Guard Area G2 26 12.4.5 Directory Area 26 12.4.6 Guard Area G3 26ISO/IEC
23、13421:1993(E) BSI 01-2000 v Page 12.5 Data Area 26 12.5.1 Physical tracks 26 12.5.2 Width of the physical tracks 26 12.5.3 Logical tracks 27 12.5.4 Locations of the physical tracks 27 12.5.5 Layout of tracks in the Data Area 27 13 Data format 29 13.1 Data Bytes 29 13.2 Logical Blocks 29 13.3 Data Bl
24、ocks 29 13.4 Types of Logical Blocks 29 13.5 Entities 29 13.6 Logical Block format 29 13.6.1 Preamble 29 13.6.2 Sync 29 13.6.3 Data Field 30 13.6.4 Control Field 1 (CF1) 30 13.6.5 Control Field 2 (CF2) 31 13.6.6 CRC 32 13.6.7 Postamble 32 14 Use of Logical Blocks 32 14.1 Data Blocks 32 14.2 Tape Mar
25、k Blocks 32 14.3 Filler Blocks 32 14.4 End of Track Blocks (EOTR) 32 14.5 End of Data Blocks (EOD) 32 14.6 ECC Blocks 32 15 Format of Entities 32 16 Error handling 32 Annex A (normative) Measurement of light transmittance 33 Annex B (normative) CRC generation 35 Annex C (normative) ECC generation 35
26、 Annex D (normative) Format of Control Field 1 38 Annex E (normative) Format of Control Field 2 38 Annex F (informative) Recommendations for transportation 39 Annex G (informative) Inhibitor tape 39 Annex H (informative) Recommendations on tape durability 40 Annex J (informative) Handling guidelines
27、 40 Figure 1 Measurement of the coating adhesion 5 Figure 2 Measurement of layer-to-layer adhesion 7 Figure 3 Measurement of electrical resistance 7 Figure 4 Measurement of abrasivity (not to scale) 8 Figure 5 Measurement of peak shift 10 Figure 6 General view 15 Figure 7 Reference planes 16 Figure
28、8 Bottom side 17 Figure 9 Right side 17 Figure 10 Back side 18ISO/IEC13421:1993(E) vi BSI 01-2000 Page Figure 11 Left side 18 Figure 12 Cross section, non-operating position 19 Figure 13 Cross section, operating position 19 Figure 14 Leader/tape connection 20 Figure 15 Position of the splice tape 20
29、 Figure 16 Tape leader 21 Figure 17 Front side 22 Figure 18 Back side, position of the door lock 22 Figure 19 Position of the leader tip 23 Figure 20 Tape layout 24 Figure 21 Calibration and Directory Area 25 Figure 22 Calibration Tracks Area 26 Figure 23 Layout of the tracks of the Data Area 28 Fig
30、ure 24 Block format 29 Figure 25 Content of Control Field 1 30 Figure 26 Content of Control Field 2 31 Figure A.1 Optical arrangement 34 Figure A.2 Measuring circuitry 35 Figure C.1 ECC Blocks 36 Figure D.1 Format of CF1 38 Figure E.1 Format of CF2 38 Table 1 Temperature and humidity cycle 6 Table 2
31、 Physical Track Locations 27ISO/IEC13421:1993(E) BSI 01-2000 vii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members ofISOor IEC participa
32、te 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 interest. Other international organizations, governmental an
33、d 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 technical committee are circulated to national bodies for vot
34、ing. Publication as an International Standard requires approval by at least75%of the national bodies casting a vote. International Standard ISO/IEC 13421was prepared by the European Computer Manufacturers Association (ECMA) (as Standard ECMA-182) and was adopted, under a special “fast-track procedur
35、e”, by Joint Technical Committee ISO/IEC JTC1, Information technology, in parallel with its approval by national bodies of ISO and IEC. Annex A to Annex E form an integral part of this International Standard. Annex F to Annex J are for information only. Patents During the preparation of the ECMA sta
36、ndard, information was gathered on patents upon which application of the standard might depend. Relevant patents were identified as belonging to Digital Equipment Corporation. However, neither ECMA nor ISO/IEC can give authoritative or comprehensive information about evidence, validity or scope of p
37、atent 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 Digital Equipment Corporation 334South Street Shrewsbury Massachusetts 01545-4112 USAviii blankISO/IEC13421:1993(E)
38、 BSI 01-2000 1 Introduction International Standards ISO 9661and ISO/IEC 11559specify data interchange on12,7mm,18-track magnetic tape cartridges. International Standard 13421concerns a cartridge of a type different from that of those International Standards. Whilst the magnetic tape is also12,7mm wi
39、de, it is recorded on48physical tracks. Also the format is different from that of these previous International Standards. It is characterized by the fact that the physical tracks, recorded and read in pairs, constitute two groups, the first recorded and read in forward direction, the second in rever
40、se direction. Section 1. General 1 Scope This International Standard specifies the physical and magnetic characteristics of a12,7mm wide, 48-track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, a format called Digital
41、Linear Tape1 (DLT1) and a recording method. Together with a labelling standard, e.g.ISO1001, it allows full data interchange by means of such magnetic tape cartridges. 2 Conformance 2.1 Magnetic tape cartridges A magnetic tape cartridge shall be in conformance with this International Standard if it
42、satisfies all mandatory requirements of this International Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating systems A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Standar
43、d if all the recordings that it makes on a tape according to2.1 meet the mandatory requirements of this International Standard. 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International Standard if it is able to
44、handle any recording made on a tape according to2.1. 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
45、 to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1001:1986, Informat
46、ion processing File structure and labelling of magnetic tapes for information interchange. ISO 1302:1992, Technical drawings Method of indicating surface texture. 4 Definitions For the purpose of this International Standard, the following definitions apply. 4.1 average signal amplitude the average p
47、eak-to-peak value of the output signal from the read head at the physical recording density of1674ftpmm measured over a minimum length of track of25,4mm, exclusive of missing pulses 4.2 azimuth the angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a trac
48、k from the line normal to the Reference Edge 4.3 back surface the surface of the tape opposite the magnetic coating which is used to record data 4.4 beginning-of-tape marker (BOT) a hole punched on the centreline of the tape towards the end nearest to the leader 4.5 byte an ordered set of bits acted
49、 upon as a unit NOTE 1In this International Standard, all bytes are8-bit bytes. 4.6 cartridge a case containing a single supply reel of12,7mm wide magnetic tape with a leader attached at the outer endISO/IEC13421:1993(E) 2 BSI 01-2000 4.7 cyclic redundancy check (CRC) character a 64-bit character, generated by a mathematical computation, used for error detection 4.8 early warning (EW) a signal generated by the drive indicating the approaching end of the recording area 4.9 error-detecting code
