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1、BRITISH STANDARD BS ISO/IEC 9529-2:1989 EN 29529-2: 1991 Incorporating Amendment No. 1 Implementation of ISO/IEC 9529-2:1989 Information processing systems Data interchange on 90 mm (3,5 in) flexible disk cartridges using modified frequency modulation recording at 15 916 ftprad, on 80 tracks on each
2、 side Part 2: Track format The European Standard EN 29529-2:1991 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9529-2:1989 This British Standard, having been prepared under the direction of t
3、he Information Technology Systems Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 October 1990 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 88/61220 DC ISBN 0 58
4、0 19072 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Information Technology Systems Standards Policy Committee (IST/-) to Technical Committee IST/4, upon which the following bodies were represented: British Computer Society British
5、Telecommunications plc Department of Trade and Industry (National Physical Laboratory) EEA (the Electronics and Business Equipment Association) HM Customs and Excise Institute of Quality Assurance Institution of Electrical Engineers Institution of Mechanical Engineers Post Office Amendments issued s
6、ince publication Amd. No.DateComments 7041June 1992Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9529-2:1989 BSI 01-2000i Contents Page Committees responsibleInside front cover National fore
7、wordii Foreword2 Forewordiii Text of ISO/IEC 9529-21 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO/IEC 9529-2:1989 ii BSI 01-2000 National foreword This British Standard reproduces verbatim ISO/IEC 9529-2:1989 and implements it as t
8、he UK national standard. ISO/IEC 9529-2:1989 was accepted as a European Standard by the European Committee for Standardization (CEN) in November 1991. This European Standard is designated EN 29529-2:1991 and is entitled “Information processing systems Data interchange on 90 mm (3,5 in) flexible disk
9、 cartridges using modified frequency modulation recording at 15 916 ftprad, on 80 tracks on each side Part 2: Track format”. This British Standard is published under the direction of the Information Technology Systems Standards Policy Committee whose Technical Committee IST/4 has the responsibility
10、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. NOTEInternational and European
11、 Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK 14 6LE. 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. Compli
12、ance 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, the EN title page, page 2, the ISO/IEC title page, pages ii to iv, pages 1 to 8 and a back cover. This standard has b
13、een updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
14、NORM EN 29529-2:1991 November 1991 UDC 681.327.63 Descriptors: Data processing, information interchange, data recording devices, frequency modulation, magnetic disks, flexible disk cartridges, track formats, specifications English version Information processing systems Data interchange on 90 mm (3,5
15、 in) flexible disk cartridges using modified frequency modulation recording at 15 916 ftprad, on 80 tracks on each side Part 2: Track format (ISO 9529-2 1st edition, 1989) Systmes de traitement de linformation Echange de donnes sur cartouches disquette de 90 mm (3,5 in) utilisant un enregistrement m
16、odulation de frquence modifie 15 916 ftprad sur 80 pistes sur chaque face Partie 2: Schma de piste (ISO 9529-2 1re dition, 1989) Informationsverarbeitungssysteme Datenaustausch auf 90 mm (3,5 in) Diskette mit Modifizierter Wechseltaktschrift mit 15 916 Fluwechsel/rad, auf 80 Spuren auf jeder Seite T
17、eil 2: Spurformat (ISO 9529-2 1. Ausgabe 1989) This European Standard was approved by CEN on 1991-11-16. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration
18、. 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. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
19、 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, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Net
20、herlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1991 Copyright reserved to all CEN members Ref. No. EN 2952
21、9-2:1991 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 29529-2:1991 2 BSI 01-2000 Foreword The Technical Board has decided to submit the International Standard 9529-2:1989 “Information processing systems Data interchange on 90 mm (3,5
22、 in) flexible disk cartridges using modified frequency modulation recording at 15 916 ftprad, with 80 tracks on each side Part 2: Track format (ISO 9529-2 1st edition, 1989)” for Formal Vote. The standard was accepted. For the time being, this document exists only in the English version. According t
23、o the CEN/CENELEC Common Rules, the following countries are bound to implement this standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun
24、 sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9529-2:1989(E) ii BSI 01-2000 Contents Page Forewordiii Introduction1 1Scope1 2Conformance1 3Normative r
25、eferences1 4General requirements1 4.1Mode of recording1 4.2Track location tolerance of the recorded flexible disk cartridge1 4.3Recording offset angle1 4.4Density of recording2 4.5Flux transition spacing2 4.6Average Signal Amplitude2 4.7Byte2 4.8Sector2 4.9Cylinder2 4.10Cylinder number2 4.11Data cap
26、acity of a track2 4.12Hexadecimal notation3 4.13Error Detection Characters (EDC)3 5Track layout3 5.1Index Gap3 5.2Sector Identifier3 5.2.1Identifier Mark4 5.2.2Address Identifier4 5.3Identifier Gap4 5.4Data Block4 5.4.1Data Mark5 5.4.2Data Field5 5.4.3EDC5 5.5Data Block Gap5 5.6Track Gap5 6Coded rep
27、resentation of data5 6.1Standards5 6.2Coding methods5 Annex A (informative) Procedure and equipment for measuring flux transition spacing6 Annex B (informative) Data separators for decoding MFM recording7 Annex C (informative) EDC implementation7 Figure 12 Figure 23 Figure 34 Figure 44 Figure 54 Fig
28、ure 65 Figure A.17 Figure C.18 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9529-2:1989(E) BSI 01-2000iii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) to
29、gether form a system for worldwide standardization as a whole. 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 an
30、d 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 technical committee, ISO/IE
31、C JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for approval before their acceptance as International Standards. They are approved in accordance with procedures requiring at least 75 % approval by the national bodies voting. Internati
32、onal Standard ISO/IEC 9529-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00
33、2006, Uncontrolled Copy, (c) BSI ISO/IEC 9529-2:1989(E) BSI 01-20001 Introduction ISO/IEC 9529 specifies the characteristics of 90 mm (3,5 in) flexible disk cartridges recorded at 15 916 ftprad using modified frequency modulation recording, on 80 tracks on each side. ISO/IEC 9529-1 specifies the dim
34、ensional, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems. ISO/IEC 9529-1 and ISO/IEC 9529-2, together with the labelling scheme specified in ISO 9293, provide for full data interchange between data processing syste
35、ms. 1 Scope This part of ISO/IEC 9529 specifies the track layout, the track format and the characteristics of the recorded signals. NOTENumeric values in the SI and/or Imperial measurement system in this part of ISO/IEC 9529 may have been rounded off and therefore are consistent with, but not exactl
36、y equal to, each other. Either system may be used, but the two should be either intermixed nor reconverted. The original design was made using SI units. 2 Conformance A 90 mm (3,5 in) flexible disk cartridge is in conformance with this Part of ISO/IEC 9529 if it meets all mandatory requirements spec
37、ified herein. A prerequisite for conformance with this part of ISO/IEC 9529 is conformance with ISO/IEC 9529-1. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC 9529. At the time of publication, the
38、 editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO/IEC 9529 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
39、 valid International Standards. ISO 646:1983, Information processing ISO 7-bit coded character set for information interchange. ISO 2022:1986, Information processing ISO 7-bit and 8-bit coded character sets Code extension techniques. ISO 4873:1986, Information processing ISO 8-bit code for informati
40、on interchange Structure and rules for implementation. ISO 6429:1988, Additional control functions for (7-bit and 8-bit coded) character-sets. ISO 8859:1987, Information processing 8-bit single-byte coded graphic character sets. ISO 9293:1987, Information processing Volume and file structure of flex
41、ible disk cartridges for information interchange. 4 General requirements 4.1 Mode of recording The mode of recording shall be Modified Frequency Modulation (MFM) for which the conditions are: a flux transition shall be written at the centre of each bit cell containing a ONE; a flux transition shall
42、be written at each cell boundary between consecutive bit cells containing ZEROs. An exception to this is defined in 4.12. 4.2 Track location tolerance of the recorded flexible disk cartridge For the purposes of this part of ISO/IEC 9529 the nominal track locations specified in sub clause 9.2.3.1 of
43、ISO/IEC 9529-1 require compensation for the actual temperature using the nominal value of the thermal coefficient of expansion specified in sub clause 8.2 of ISO/IEC 9529-1. Over the range of operating environment specified in sub clause 6.1.2 of ISO/IEC 9529-1, the centrelines of the recorded track
44、s shall be within 0,028 mm ( 0,001 1 in) of these compensated nominal track locations. 4.3 Recording offset angle At the instant of writing or reading a magnetic transition, the transition shall have an angle of = arc sin 0 18 where Rn is the radius through that transition (see ISO/IEC 9529-1, 9.2.3
45、.1). d Rn - - Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 23 04:34:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO/IEC 9529-2:1989(E) 2 BSI 01-2000 4.4 Density of recording 4.4.1 The nominal density of recording shall be 15 916 ftprad. The resulting nominal bit cell length is 62,8 4rad. 4.
46、4.2 The long term average bit cell length shall be the average bit cell length measured over a sector. It shall be within 2,5 % of the nominal bit cell length. 4.4.3 The short term average bit cell length, referred to a particular bit cell, shall be the average of the lengths of the eight preceding
47、bit cells. It shall be within 8 % of the long-term average bit cell length. 4.5 Flux transition spacing The instantaneous spacings between flux transitions are influenced by the reading and writing process, the bit sequence (pulse crowding effects) and other factors. The locations of the transitions
48、 are defined as the locations of the peaks in the signal when reading (see Annex A and Annex B). 4.5.1 The spacing between the flux transitions of a sequence of ONEs shall be between 80 % and 120 % of the short-term average bit cell length. 4.5.2 The spacing between the flux transition for a ONE and
49、 that between two ZEROs preceding or following it shall be between 130 % and 165 % of the short-term average bit cell length. 4.5.3 The spacing between the flux transitions of two ONEs surrounding a ZERO shall be between 185 % and 225 % of the short-term average bit cell length. 4.6 Average Signal Amplitude For each side the Average Signal Amplitude on any track of the interchanged flexible disk cartridge shall be less than 160 % of SRA1f and more than 40 % of SRA2f (see 4.12 i