1、BRITISH STANDARD BS EN ISO/IEC 7487-1:1995 Implementation of EN ISO/IEC 7487-1:1995 Information technology Data interchange on130mm (5,25 in) flexible disk cartridges using modified frequency modulation recording at7958ftprad, 1,9tpmm(48tpi), on both sides ISO type202 Part 1: Dimensional, physical a
2、nd magnetic characteristics The European Standard ENISO/IEC7487-1:1995 has the status of a British StandardBSENISO/IEC7487-1:1995 This British Standard, having been prepared under the directionof the Information Systems Technology Assembly,was published underthe authorityof the Standards Boardand co
3、mes intoeffect on 15 August 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 92/63404 DC ISBN 0 580 24348 6 Committees responsible for this BritishStandard The preparation of this British Standard was entrusted to Technica
4、l Committee IST/4, Magnetic and optical media for digital data interchange, upon which the following bodies were represented: British Computer Society Institute of Quality Assurance Institution of Electrical Engineers Kodak Limited Coopted members Amendments issued since publication Amd. No. Date Co
5、mmentsBSENISO/IEC7487-1:1995 BSI 01-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Foreword iii Text of ISO/IEC 7487-1 1BSENISO/IEC7487-1:1995 ii BSI 01-2000 National foreword This British Standard is the English language version of ENISO/IEC7487-1:199
6、5 and implements it as the UK national standard. Itsupersedes BS7024-1:1988, which is withdrawn. This British Standard is published under the direction of the Information Systems Technology Assembly whose Technical Committee IST/14 has the responsibility to: aid enquirers to understand the text; pre
7、sent 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 Standards, as well as overseas standards, ar
8、e available from Customer Services,BSI,389 Chiswick High Road, LondonW44AL. 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 confe
9、r immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO/IEC title page, page 2, the ISO/IEC title page, pages ii to iv, pages1to 17 and a back cover. This standard has been updated (see copyright date) and may have h
10、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO/IEC 7487-1 February 1995 ICS 35.220.20 Descriptors: Data processing, information interchange, data recording, data recording devices, magnetic
11、recording, magnetic disks, flexible disk cartridges, specifications, dimensions, physical properties, magnetic properties, track formats, interchangeability English version Information technology Data interchange on130mm (5,25in) flexible disk cartridges using modified frequency modulation recording
12、 at7958 ftprad, 1,9tpmm (48tpi), onboth sides ISO type202 Part 1: Dimensional, physical and magnetic characteristics (ISO/IEC 7487-1:1993) Technologies de linformation Echange de donnes sur cartouches disquettes de130mm(5,25in) utilisant un enregistrement modulation de frquence modifie (MFM) 7958 ft
13、prad, 1,9tpmm (48tpi) sur les deux faces Type ISO202 Partie1:Caractristiques dimensionnelles, physiques et magntiques (ISO/IEC7487-1:1993) Informationstechnik Datenaustausch auf130mm (5,25in) Disketten mit Modifizierter Wechseltaktschrift bei zweiseitiger Aufzeichnung mit7958 Fluwechselrad und1,9 Sp
14、uren/mm(48tpi) ISO Typ202 Teil1: Mae, physikalische und magnetische Eigenschaften (ISO/IEC7487-1:1993) This European Standard was approved by CEN on 1995-01-11. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
15、the 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. This European Standard exists in three official versions (English, French, Germ
16、an). 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, G
17、ermany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, 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 1995 Al
18、l rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. ENISO/IEC7487-1:1995 EENISO/IEC7487-1:1995 BSI 01-2000 2 Foreword This European Standard has been taken over from the Joint Technical Committee ISO/IECJTC1, Information
19、Technology. ENISO/IEC7487-1:1995 supersedes EN27487-1:1989. 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 August1995, and conflicting national standards shall be withdrawn at the latest by Augus
20、t1995. According to 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, Spain, Sweden, Switzerland, UnitedKingdom.ENIS
21、O/IEC7487-1:1995 ii BSI 01-2000 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Conformance 1 3 Normative references 1 4 Definitions 1 5 General description 2 6 General requirements 2 7 Dimensional characteristics 6 8 Physical characteristics 7 9 Magnetic characteristics 8 Annex A (normative)
22、Measurement of the cartridge thickness 12 Annex B (normative) Measurement of light transmittance 13 Annex C (normative) Method for measuring the effective track width 16 Annex D (informative) Use of hub support rings 17 Annex E (informative) Bibliography 17 Figure 1 Flexible disk cartridge 3 Figure
23、2 Protective envelope with cartridge 4 Figure 3 Jacket dimensions 5 Figure 4 Cartridge thickness 10 Figure 5 Disk dimensions 10 Figure 6 Pressure pad area 11 Figure A.1 Measuring gauge for maximum thickness 12 Figure A.2 Measuring gauge for minimum thickness 13 Figure B.1 Measuring device 15 Figure
24、B.2 Electronic circuitry 15 Figure C.1 Track width 16ENISO/IEC7487-1:1995 BSI 01-2000 iii Foreword ISO (the International Organization for Standardization) and IEC (theInternational Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are membe
25、rs 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 and IEC technical committees collaborate in fields of mutual interest. Other international orga
26、nizations, 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/IECJTC1. Draft International Standards adopted by the joint technical committee are circulated
27、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/IEC7487-1 was prepared by Joint Technical Committee ISO/IECJTC1, Information technology, SubcommitteeSC11, Flexible magnetic medi
28、a for digital data interchange. This second edition cancels and replaces the first edition (ISO7487-1:1985), of which it constitutes a technical revision. ISO/IEC 7487 consists of the following parts, under the general title Informationtechnology Data interchange on130mm (5,25in) flexible diskcartri
29、dges using modified frequency modulation recording at7958ftprad, 1,9tpmm(48tpi), on both sides ISO type202: Part 1: Dimensional, physical and magnetic characteristics; Part 2: Track format A; Part 3: Track format B. Annex A,Annex B andAnnex C form an integral part of this part of ISO/IEC7487. Annex
30、D andAnnex E are for information only.iv blankENISO/IEC7487-1:1995 BSI 01-2000 1 Introduction ISO/IEC7487 specifies the characteristics of130mm(5,25in) flexible disk cartridges recorded at7958ftprad,1,9tpmm(48tpi), on both sides using modified frequency modulation recording. ISO 7487-2 and ISO7487-3
31、 each specify the quality of recorded signals, the track layout, and a track format to be used on such a flexible disk cartridge, which is intended for data interchange between data processing systems. Together with the labelling scheme specified in ISO7665, ISO/IEC7487-1 and ISO7487-2 provide for a
32、 full data interchange between data processing systems. Together with the labelling scheme specified in ISO9293, ISO/IEC7487-1 and ISO7487-3 provide for another full data interchange between data processing systems. In accordance with ISO/IEC9983, flexible disk cartridges conforming to this part of
33、ISO/IEC7487 should be designated as “ISO type202”. 1 Scope This part of ISO/IEC7487 specifies the dimensional, physical and magnetic characteristics of the cartridge so as to provide physical interchangeability between data processing systems. 2 Conformance A flexible disk cartridge shall be in conf
34、ormance with ISO7487 when it meets all the requirements of ISO/IEC7487-1 and those of either ISO7487-2 or ISO7487-3. NOTE 1Numeric values in the SI and/or imperial measurement system in this International Standard may have been rounded off and therefore are consistent with, but not exactly equal to,
35、 each other. Either system may be used, but the two should be neither intermixed nor reconverted. The original design was made using Imperial units and further developments were made using SI units. 3 Normative references The following standards contain provisions which, through reference in this te
36、xt, constitute provisions of this part of ISO/IEC7487. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO/IEC7487 are encouraged to investigate the possibility of applying the most recent editions
37、of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 7487-2:1985, Information processing Data interchange on130mm (5.25in) flexible disk cartridges using modified frequency modulation recording at7958ftprad,1,9tpmm (48tpi), on bo
38、th sides Part2: Track format A. ISO 7487-3:1986, Information processing Data interchange on 130 mm (5.25in) flexible disk cartridges using modified frequency modulation recording at7958ftprad,1,9tpmm(48tpi), on both sides Part3: Track formatB. ISO 7665:1983, Information processing File structure and
39、 labelling of flexible disk cartridges for information interchange. ISO 9293:1987, Information processing Volume and file structure of flexible disk cartridges for information interchange. 4 Definitions For the purposes of this part of ISO/IEC7487, the following definitions apply. 4.1 flexible disk
40、a flexible disk which accepts and retains on the specified side or sides magnetic signals intended for input/output and storage purposes of information data processing and associated systems 4.2 master standard reference flexible disk cartridge a reference flexible disk cartridge selected as the sta
41、ndard for reference fields, signal amplitudes, resolution, and overwrite. Track00 and Track39 on each side are defined as reference tracks NOTE 2The Master Standard has been established by the Physikalisch-Technische Bundesanstalt (PTB), Bundesallee100, D-38023 Braunschweig, Germany. 4.3 secondary s
42、tandard reference flexible disk cartridge a flexible disk cartridge, the performance of which is known and stated in relation to that of the master standard reference flexible disk cartridge NOTE 3Secondary standard reference flexible disk cartridges may be ordered from PTB Lab1.41 under part number
43、 RM7487, as long as available. It is intended that these be used for calibrating tertiary cartridges for use in routine calibrations. 4.4 typical field (for each side) the minimum recording field, which, when applied to a flexible disk cartridge, causes a signal output equal to95% of the maximum ave
44、rage signal amplitude when taken as a function of the recording field at the specified track and flux transition frequency of that flexible disk cartridgeENISO/IEC7487-1:1995 2 BSI 01-2000 4.5 reference field the typical field of the signal amplitude reference flexible disk cartridge. There are two
45、reference fields, one for each side 4.6 test recording current (for each side) the current between145% and155% of the current which produces the reference field at125000 flux transitions per second (ftps) on track00 on both sides 4.7 standard reference amplitude (SRA) (for each side) the average sig
46、nal amplitudes derived from the reference tracks of the master standard reference flexible disk cartridge using the appropriate test recording current SRA 1is the average signal amplitude from a recording written using125000ftps(f 1 ) SRA 2is the average signal amplitude from a recording written usi
47、ng250000ftps (f 2 ) 4.8 average signal amplitude the arithmetically averaged value for a track of the output voltages measured peak-to-peak over the whole track 4.9 in-contact an operating condition in which the magnetic surface of the disk intended for data storage is in physical contact with the m
48、agnetic heads 4.10 formatting writing the proper control information, establishing the physical tracks, and designating the addresses of physical records on the flexible disks surfaces 4.11 initialization writing the volume label, the ERMAP label and other information initially required to be on the
49、 flexible disk cartridge prior to the commencement of general processing or use 4.12 recording area that area of each disk surface with which the head may come into contact 5 General description 5.1 General figures A typical flexible disk cartridge is represented inFigure 1 andFigure 2. 5.2 Main elements The main elements of this flexible disk cartridge are: the disk; the liner; the jacket. The cartridge is stored in an envelope. 5.3 Description The jacket is of a square form.
