1、BRITISH STANDARD BS EN 28630-2:1992 ISO 8630-2: 1987 Incorporating Amendment Nos. 0 and 1 Guide to Construction and use of130mm (5.25 in) flexible disk cartridges for data interchange, using modified frequency modulation recording at13262ftprad, on80tracks each side Part 2: Track format A for 77 tra
2、cks The European Standard EN 28630-2:1992 has the status of a British Standard UDC 681.327.63BSEN28630-2:1992 This British Standard, having been prepared under the directionof the Information Systems Technology Standards Committee, was published underthe authority of the Board ofBSI and comes into e
3、ffect on 30September1988 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 87/66413 DC ISBN 0 580 16523 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Information
4、 Systems Technology 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 Tr
5、ade and Industry (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 Nat
6、ional Computing Centre Ltd. Post Office Coopted members Amendments issued since publication Amd. No. Date of issue Comments 7323 December 1992 8192 June 1994 Indicated by a sideline in the marginBSEN28630-2:1992 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword
7、ii Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 Conformance 3 3 References 3 4 General requirements 3 5 Track layout after the first formatting for track 00, side 0 5 6 Track layout after the first formatting for all tracks other than track 00, side 0 7 7 Track layout of a record
8、ed flexible disk for data interchange 8 Annex A EDC implementation 11 Annex B Procedure and equipment for measuring flux transition spacing 11 Annex C Data separators for decoding MFM recording 13 Figure 1 4 Figure 2 4 Figure 3 6 Figure 4 7 Figure 5 8 Figure 6 9 Figure 7 11 Figure 8 12 Figure 9 13 T
9、able 1 5 Table 2 6 Table 3 6 Table 4 7 Table 5 8 Table 6 8 Table 7 8 Table 8 8 Publications referred to Inside back coverBSEN28630-2:1992 ii BSI 01-2000 National foreword This Part of BS 6957, prepared under the direction of the Information Systems Technology Standards Committee, is identical with I
10、SO8630-2:1987 “Information processing Data interchange on130mm (5.25in) flexible disk cartridges using modified frequency modulation recording at13262ftprad, on 80 tracks on each side Part2: Track format A for77 tracks”, published by the International Organization for Standardization (ISO). In 1992
11、the European Committee for Standardization (CEN) accepted ISO8630-2:1987 as European Standard EN28630-2:1992. As a consequence of implementing the European Standard this British Standard is renumbered as BSEN28630-2 and any reference to BS6957-2 should be read as a reference to BS EN28630-2. In1993
12、CEN accepted ISO Technical Corrigendum1:1992 to ISO8630-2 as Amendment1:1993 to EN28630-2. 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 specificatio
13、ns 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 BS 0-3, but the BSI Technical Committee considers the text is useful as a guide when disks are being d
14、escribed or specified. For this reason this Part of BS6957 has 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 claims
15、of compliance with this Part of BS6957 should 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 Stan
16、dards; 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 ISO 8630” and “ISO 8630” appear, referring to this s
17、tandard, they should be read as “Part of BS 6957” and “BS 6957” respectively. Cross-references International Standard Corresponding British Standard ISO 646:1983 BS 4730:1985 Specification for UK 7-bit coded character set (Identical, exercising national options) ISO 2022:1986 BS 6856:1987 Specificat
18、ion for code extension techniques for United Kingdom 7-bit and 8-bit coded character sets (Identical) ISO 4873:1986 BS 6006:1987 Specification for structure and rules for implementation of United Kingdom 8-bit coded character set (Identical) ISO 6429:1983 DD 94:1984 Definition of additional control
19、functions for character-imaging devices for information processing, using extended ISO 7-bit and 8-bit coded character sets (Identical) ISO 7665:1983 BS 6542 File structure and labelling of flexible disk cartridges for information interchange Part 1:1984 Specification for sequential file allocation
20、structure (Identical)BSEN28630-2:1992 BSI 01-2000 iii The Technical Committee has reviewed the provisions of ISO 7065-2, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the
21、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. International Standard Corresponding British Standard BS 6957 Guide to construction and use of13
22、0mm(5.25in) flexible disk cartridges for data interchange, using modified frequency modulation recording at13262 ftprad, on80tracks on each side ISO 8630-1:1987 Part 1:1988 Dimensional, physical and magnetic characteristics (Identical) ISO 8630-3:1987 Part 3:1988 Track format B for 80 tracks (Identi
23、cal) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, theENtitle page, pages2 to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendmen
24、t table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 28630-2 August 1992 +A1 November 1993 UDC 681.327.63 Descriptors: Data processing, information interchange, data recording devices, magnetic disks, flexible disk cartridges, recording tracks, track format,
25、 specifications English version Information processing Data interchange on130mm(5.25 in) flexible disk cartridges using modified frequency modulation recording at 13 262 ftprad, on80tracks each side Part 2: Track format A for 77 tracks (includes amendment A1:1993) (ISO 8630-2:1987) Traitement de lin
26、formation change de donnes sur cartouches disquettes de130mm (5,25 in) utilisant un enregistrement modulation de frquence modifie (MFM) 13262 ftprad sur 80 pistes sur chaque face Partie 2: Schma de piste A pour 77 pistes (inclut lamendement A1:1993) (ISO 8630-2:1987) Informationsverarbeitung Datenau
27、stausch auf 130mm(5,25 in) Disketten mit modifizierter Wechseltakschrift bei zweiseitiger Aufzeichnung mit 13 262 Flusswechsel/rad und 80 Spuren auf jeder Seite Teil 2: Spurformat A fr 77 Spuren (enthlt nderungen A1:1993) (ISO 8630-2:1987) This European Standard was approved by CEN on 1992-08-13. CE
28、N 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 bibliographical references concerning such national standards may be obtained on app
29、lication 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 CEN member into its own language and notified to the Central Secretariat has
30、 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, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Stand
31、ardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1992 Copyright reserved to CEN members Ref. No. EN 28630-2:1992 + A1:1993 EEN28630-2:1992 2 BSI 01-2000 Foreword The Technical Board has decided to submit the Internation
32、al Standard 8630-2:1987 Information processing Data interchange on 130mm (5.25in) flexible disk cartridges using modified frequency modulation recording at13262 ftprad, on80 tracks each side Part 2: Track format A for 77 tracks for Formal Vote. The standard was accepted. This European Standard shall
33、 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. According to the CEN/CENELEC Common Rules the following countries are bound
34、to implement this standard: Austria Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom. Foreword to Amendment A1 The Technical Board decided to submit the draft Amendment Information proces
35、sing Data interchange on130mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 13 262 ftprad, on 80 tracks each side Part 2: Track format A for 77 tracks (ISO 8630-2:1987, Technical Corrigendum 1:1992), to the Unique Acceptance Procedure (UAP). The result, of the U
36、nique 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 the latest by May1994, and conflicting national standards shall
37、 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, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spa
38、in, Sweden, Switzerland and UnitedKingdom.EN28630-2:1992 BSI 01-2000 3 0 Introduction ISO 8630 specifies the characteristics of130mm(5.25in) flexible disk cartridges recorded at13262 ftprad, using modified frequency modulation (MFM) recording, on 80tracks on each side. ISO 8630-1 specifies the dimen
39、sional, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems. ISO 8630-3 specifies an alternative track format for data interchange. ISO 8630-1 and ISO 8630-2, together with the labelling scheme specified in ISO 7665, pr
40、ovide for full data interchange between data processing systems. 1 Scope and field of application This part of ISO8630 specifies the quality of recorded signals, the track layout, and a track format to be used on130mm (5.25in), 13262 ftprad flexible disk cartridges intended for data interchange betw
41、een data processing systems. NOTENumeric values in the SI and/or imperial measurement system in this part of ISO8630 may have been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system may be used, but the two should be neither intermixed nor re-converted
42、. 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 ISO8630 when it meets all the requirements of parts 1 and 2 of ISO8630 and when it implements one of the three sector sizes spec
43、ified in4.11. Data interchange is possible only when the interchange parties implement the same sector size. NOTEISO7665 specifies a field in the volume label in which the implemented sector size is identified. 3 References ISO 646, Information processing ISO 7-bit coded character set for informatio
44、n interchange. ISO 2022, Information processing ISO 7-bit and8-bit coded character sets Code extension techniques. ISO 4873, Information processing ISO 8-bit code for information interchange Structure and rules for implementation. ISO 6429, Information processing ISO 7-bit and8-bit character sets Ad
45、ditional control functions for character-imaging devices. ISO 7065-2, Information processing Data interchange on200mm (8 in) flexible disk cartridges using modified frequency modulation recording at13 262 ftprad, 1,9 tpmm (48 tpi), on both sides Part 2: Track format. ISO 7665, Information processing
46、 File structure and labelling of flexible disk cartridges for information interchange. 4 General requirements 4.1 Mode of recording 4.1.1 Track 00, side 0 The mode of recording shall be two-frequency where the start of every bit cell is a clock flux transition. AONE is represented by a data flux tra
47、nsition between two clock flux transitions. Exceptions to this are defined in4.12. 4.1.2 All tracks excluding track 00, side 0 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 containi
48、ng a ONE; b) a flux transition shall be written at each cell boundary between consecutive bit cells containing ZEROs. Exceptions to this are defined in4.12. 4.2 Track location tolerance of the recorded flexible disk cartridge The centrelines of the recorded tracks shall be within 0,0425mm ( 0.00167
49、in) of the nominal positions, over the range of operating environment specified in ISO 8630-1. 4.3 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 in4.2 and4.3, a band of old information may be left at one edge of the newly written data and would constitute unwanted noise when reading. It is therefore necessary to trim the edges of the tracks
