1、BRITISH STANDARD BS EN 28630-3:1992 ISO 8630-3: 1987 Incorporating Amendment Nos. 0 and 1 Guide to Construction and use of130mm (5.25in) flexible disk cartridges for data interchange, using modified frequency modulation recording at13262ftprad, on80tracks each side Part 3: Track format B for80tracks
2、 The European Standard EN28630-3:1992has the status of a British Standard UDC 681.327.63BSEN28630-3:1992 This British Standard, having been prepared under the directionof the Information Systems Technology Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton
3、 30September1988 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment87/66414 DC ISBN 0 580 16524 8 Committees responsible for this BritishStandard The preparation of this British Standard was entrusted by the Information Systems T
4、echnology Standards Committee (IST/-) to Technical Committee IST/4, upon which the following bodies were represented: Association for Payment Clearing Services British Computer Society British Telecommunications plc Business Equipment and Information Technology Association Department of Trade and In
5、dustry (National Physical Laboratory) HM Treasury (Central Computer and Telecommunications Agency) Institute of Administrative Management Institute of Quality Assurance Institution of Electrical Engineers Institution of Electronic and Radio Engineers Institution of Mechanical Engineers National Comp
6、uting Centre Ltd. Post Office Coopted members Amendments issued since publication Amd. No. Date of issue Comments 7324 December 1992 8193 June 1994 Indicated by a sideline in the marginBSEN28630-3:1992 BSI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii Forewor
7、d 2 0 Introduction 3 1 Scope and field of application 3 2 Conformance 3 3 References 3 4 General requirements 3 5 Track layout 4 6 Coded representation of data 6 Annex A EDC implementation 7 Annex B Procedure and equipment for measuring flux transition spacing 7 Annex C Data separators for decoding
8、MFM recording 9 Figure 1 4 Figure 2 5 Figure 3 6 Figure 4 7 Figure 5 8 Table 1 5 Table 2 5 Publications referred to Inside back coverBSEN28630-3:1992 ii BSI 02-2000 National foreword This Part of BS6957, prepared under the direction of the Information Systems Technology Standards Committee, is ident
9、ical with ISO8630-3:1987 “Information processing Data interchange on130mm (5.25in) flexible disk cartridges using modified frequency modulation recording at13 262ftprad, on80tracks on each side Part3: Track format B for80tracks”, published by the International Organization for Standardization (ISO).
10、 In1992the European Committee for Standardization (CEN) accepted ISO8630-3:1987as European Standard EN28630-3:1992. As a consequence of implementing the European Standard this British Standard is renumbered as BSEN28630-3and any reference to BS6957-3should be read as a reference to BS EN28630-3. In
11、1993 CEN accepted ISO Technical Corrigendum 1:1992 to ISO8630-3 as Amendment 1:1993 to EN 28630-3. The purpose of this standard is to define those characteristics necessary for successful data interchange using magnetic disks. The information contained is intended as a guide to writing complete spec
12、ifications for manufacture, purchasing and/or testing. The text of the International Standard does not accord with the recommendations for drafting product specifications given in the ISO Directives, or in BS0-3, but the BSI Technical Committee considers the text is useful as a guide when disks are
13、being described or specified. For this reason this Part of BS6957has a different title from the International Standard; it is issued as a British Standard guide, and it should only be used as such. It should not be used on its own as a British Standard product specification, and, in particular, no c
14、laims of compliance with this Part of BS6957should be made. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British
15、 Standards; attention is drawn especially to the following. For metric units the comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “part of ISO8630” and “ISO8630” appear, referring to thi
16、s standard, they should be read as “Part of BS6957” and “BS6957” respectively. Cross-references International Standard Corresponding British Standard ISO646:1983 BS4730:1985 Specification for UK7-bit coded character set (Identical, exercising national options) ISO2022:1986 BS6856:1987 Specification
17、for code extension techniques for United Kingdom7-bit and8-bit coded character sets (Identical) ISO4873:1986 BS6006:1987 Specification for structure and rules for implementation of United Kingdom8-bit coded character set (Identical) ISO6429:1983 DD94:1984 Definition of additional control functions f
18、or character-imaging devices for information processing, using extended ISO7-bit and8-bit coded character sets (Identical) BS6957 Guide to construction and use of130mm (5.25in) flexible disk cartridges for data interchange, using modified frequency modulation recording at13 262ftprad, on80tracks on
19、each sideBSEN28630-3:1992 BSI 02-2000 iii 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.
20、 International Standard Corresponding British Standard ISO8630-1:1987 Part1:1988 Dimensional, physical and magnetic characteristics (Identical) ISO8630-2:1987 Part2:1988 Track format A for77tracks (Identical) ISO9293:1988 BS6542 File structure and labelling of flexible disk cartridges for informatio
21、n interchange Part2:1988Specification for variable file allocation structure (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, theENtitle page, pages 2to 10, an inside back cover and a back cover. This standard has been updated (see copyright d
22、ate) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 28630-3 August 1992 +A1 November1993 UDC 681.327.63 Descriptors: Data processing, information interchange, data recordin
23、g devices, magnetic disks, flexible disks, flexible disk cartridges, recording tracks, trackformat, specifications English version Information processing Data interchange on130mm (5.25in) flexible disk cartridges using modified frequencymodulation recording at13262ftprad, on80tracks each side Part3:
24、 Track format B for80tracks (includes amendment A1:1993) (ISO8630-3:1987) Traitement de linformation change de donnes sur cartouches disquettes de130mm (5,25in) utilisant un enregistrement modulation de frquence modifie (MFM) 13262ftprad sur 80pistes sur chaque face Partie3: Schma de piste B pour80p
25、istes (inclut lamendement A1:1993) (ISO8630-3:1987) Informationsverarbeitung Datenaustausch auf 130mm (5,25in) Disketten mit modifizierter Wechseltaktschrift bei zweiseitiger Aufzeichnung mit13262Flusswechsel/rad und80Spuren auf jeder Seite Teil3: Spurformat B fr80Spuren (enthlt nderungen A1:1993) (
26、ISO8630-3:1987) This European Standard was approved by CEN on1992-08-13. 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. Up-to-date lists and bibliogra
27、phical 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 under the responsibility of a C
28、EN 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, Netherlands, Norway, Portugal, Spai
29、n, 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 1992Copyright reserved to CEN members Ref. No. EN28630-3:1992+A1:1993 EEN28630-3:1992 BSI 02-20
30、00 2 Foreword The Technical Board has decided to submit the International Standard 8630-3:1987 Information processing Data interchange on 130mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 13262 ftprad, on 80 tracks each side Part 3: Track format B for 80 track
31、s for Formal Vote. The standard was accepted. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1993 and conflicting national standards shall be withdrawn at the latest by February 1993. Ac
32、cording to 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, United Kingdom. Foreword to Amendment A1
33、The Technical Board decided to submit the draft Amendment Information processing Data interchange on130mm (5.25in) flexible disk cartridges using modified frequency modulation recording at13262ftprad, on80tracks each side Part3: Track format B for80tracks (ISO8630-3:1987, Technical Corrigendum1:1992
34、), to the Unique Acceptance Procedure (UAP). The result of the Unique Acceptance Procedure was positive. For the time being, this document exists only in English. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at
35、 the latest by May1994, and conflicting national standards shall be withdrawn at the latest by May1994. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland
36、, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom.EN28630-3:1992 BSI 02-2000 3 0 Introduction ISO8630specifies the characteristics of130mm(5.25in) flexible disk cartridges recordedat13262ftprad, using modified frequency modulation (MFM) recordi
37、ng, on80tracks on each side. ISO8630-1specifies the dimensional, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems. ISO8630-2specifies an alternative track format for data interchange. ISO8630-1and ISO8630-3, together
38、 with the labelling scheme specified in ISO9293, provide for full data interchange between data processing systems. 1 Scope and field of application This part of ISO8630specifies the quality ofrecorded signals, the track layout, andatrackformat to be used on130mm (5.25in), 13262ftprad flexible disk
39、cartridges intended for data interchange between data processing systems. NOTENumeric values in the SI and/or Imperial measurement system in this part of ISO8630may have been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two s
40、hould be neither intermixed nor re-converted. The original design was made using Imperial units and further developments were made using SI units. 2 Conformance A flexible disk cartridge shall be in conformance with ISO8630when it meets all the requirements of parts1and3of ISO8630. NOTEISO9293specif
41、ies a field in the volume label. 3 References ISO646, Information processing ISO7-bit coded character set for information interchange. ISO2022, Information processing ISO7-bit and8-bit coded character sets Code extension techniques. ISO4873, Information processing ISO8-bit code for information inter
42、change Structure and rules for implementation. ISO6429, Information processing ISO7-bit and8-bit character sets Additional control functions for character-imaging devices. ISO9293, Information processing Volume and file structure of flexible disk cartridges for information interchange. 4 General req
43、uirements 4.1 Mode of recording The mode of recording shall be Modified Frequency Modulation (MFM) for which the conditions are a) a flux transition shall be written at the centre of each bit cell containing a ONE; b) a flux transition shall be written at each cell boundary between consecutive bit c
44、ells containing ZEROs. Exceptions to this are defined in 4.12. 4.2 Track location tolerance of the recorded flexible disk cartridge The centrelines of the recorded tracks shall be within 0,0425mm ( 0.00167in) of the nominal positions, over the range of operating environment specified in ISO8630-1. 4
45、.3 Recording offset angle At the instant of writing or reading a magnetic transition, the transition shall have an angle of0 18 with the radius. NOTEAs tracks may be written and overwritten at extremes of the tolerances given in 4.2 and 4.3, a band of old information may be left at one edge of the n
46、ewly written data and would constitute unwanted noise when reading. It is therefore necessary to trim the edges of the tracks by erasure after writing. 4.4 Density of recording 4.4.1 The nominal density of recording shall be13262ftprad 1) . The resulting nominal bit cell length is75,54rad. 4.4.2 The
47、 long-term average bit cell length shall be the average bit cell length measured over a sector. It shall be within 3,0% 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 preceding eight bit cell
48、s. It shall be within 8% of the long-term average bit cell length. 4.5 Flux transition spacing (See Figure 1) The instantaneous spacing between flux transitions may be influenced by the reading and writing process, the bit sequence recorded (pulse crowding effects) and other factors. The locations o
49、f the transitions are defined as the locations of the peaks in the signal when reading. Tests should be carried out using a peak-sensing read amplifier (see Annex B and Annex C). 4.5.1 The spacing between the flux transitions in a sequence of ONEs shall be between80% and120% of the short-term average bit cell length. 1) Flux transitions per radianEN28630-3:1992 4 BSI 02-2000 4.5.2 The spacing between the flux transition for a ONE and that between two ZEROs preceding or following it shall be between130% and165% of t
