1、BRITISH STANDARD BS 7023-1: 1988 EN 28378-1: 1989 ISO 8378-1: 1986 Guide to Construction and use of130 mm (5.25 in) flexible disk cartridges for data interchange using modified frequency modulation recording at 7958 ftprad, 3.8 tpmm (96 tpi) on both sides Part 1: Dimensional, physical and magnetic c
2、haracteristics ISO title: Information processing Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad, 3,8 tpmm (96 tpi), on both sides Part 1: Dimensional, physical and magnetic characteristics The European Standard EN 28378-1:1
3、989 has the status of a British Standard UDC 681.327.634:.002.2:.004.14BS7023-1:1988 This British Standard, having been prepared under the directionof the Information Systems Technology Standards Committee, was published underthe authority of the BoardofBSI and comes into effect on 28February1989 BS
4、I 12-1999 The following BSI references relate to the work on this standard: Committee reference IST/4 Draft for comment 88/60280DC ISBN 0 580 16914 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Information Systems Technology Standard
5、s 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 Industry (National P
6、hysical Laboratory) HM Customs and Excise 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
7、Computing Centre Ltd. Post Office Amendments issued since publication Amd. No. Date of issue Comments 7042 February 1992 Indicated by a sideline in the marginBS7023-1:1988 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Brief history 2 0 Introduction 3 1 Sc
8、ope and field of application 3 2 Conformance 3 3 References 3 4 Definitions 3 5 General description 4 6 General requirements 4 7 Dimensional characteristics 5 8 Physical characteristics 7 9 Magnetic characteristics 7 10 Bibliography 9 Annex A Measurement of the cartridge thickness 14 Annex B Measure
9、ment of light transmittance 16 Annex C Method for measuring the effective track width 19 Annex D Use of hub support rings 19 Figure 1 Flexible disk cartridge 9 Figure 2 Section A-A 10 Figure 3 Protective envelope with cartridge 10 Figure 4 Jacket dimensions 11 Figure 5 Cartridge thickness 12 Figure
10、6 Disk dimensions 12 Figure 7 Disk thickness 12 Figure 8 Pressure pad area 13 Figure 9 Measuring gauge 14 Figure 10 Measuring gauge 15 Figure 11 Stylus 15 Figure 12 Measuring device 18 Figure 13 Electronic circuitry 18 Figure 14 Track width 19 Publications referred to Inside back coverBS7023-1:1988
11、ii BSI 12-1999 National foreword This Part of BS7023, prepared under the direction of the Information Systems Technology Standards Committee, is identical with ISO8378-1:1986 “Information processing Data interchange on130mm (5.25in) flexible diskcartridges using modified frequency modulation recordi
12、ng at7958ftprad,3,8tpmm (96tpi), on both sides Part1: Dimensional, physical and magnetic characteristics” published by the International Organization for Standardization (ISO). In 1989 the European Committee for Standardization (CEN) accepted ISO8378-1 as European Standard EN28378-1:1989. The purpos
13、e of this standard is to define those characteristics necessary for successful data interchange using flexible disk cartridges. The information contained is intended as a guide to writing complete specifications for manufacture, purchasing and/or testing. The text of the International Standard does
14、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 cartridges are being described or specified. For this reason this Part of BS7023 has a different title from t
15、he 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 of compliance with this Part of BS7023 should be made. Terminology and conventions. The t
16、ext 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 Standards; attention is drawn especially to the following. For metric units the comma has bee
17、n 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 ISO8378” and “ISO8378” appear, referring to this standard, they should be read as “Part of BS7023” and “BS7023” respectively. The Technical C
18、ommittee has reviewed the provisions of ISO9293, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. Cross-references International Standard Corresponding British Standard ISO 7665:1983 BS 6542 File structure and labelling of fl
19、exible disk cartridge for information interchange Part 1:1984 Specification for sequential file allocation structure (Identical) BS 7023 Guide to construction and use of 130 mm (5.25in) flexible disk cartridges for data interchange, using modified frequency modulation recording at7958ftprad, 3,8tpmm
20、 (96tpi) on both sides ISO 8378-2:1986 Part 2:1988 Track format A (Identical) ISO 8378-3:1986 Part 3:1988 Track format B (Identical)BS7023-1:1988 BSI 12-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for
21、their 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, pagesi toiv, theENtitle page, pages2 to20, an inside back cover and a back cover. This standard has
22、been updated (see copyright date) 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 28378-1 March 1989 UDC 681.327.634 Descriptors: Data processing, information interchange, f
23、lexible disk cartridges, magnetic recording, frequency modulation, dimensions, physical properties, magnetic properties English version Information processing. Data interchange on130mm(5,25in) flexible disk cartridges using modifiedfrequency modulation recording at7958ftprad,3,8tpmm (96tpi), on both
24、 sides. Part 1: Dimensional, physical and magnetic characteristics (ISO 8378-1, 1st edition, 1986) Traitement de linformation. Echange de donnes sur cartouches disquette de130mm(5,25in) utilisant un enregistrement modulation de frquence modifie 7958ftprad, 3,8tpmm (96tpi), surdeux faces. Partie1: Ca
25、ractristiques dimensionnelles, physiques et magntiques (ISO8378-1, lre dition, 1986) Informationsverarbeitung. Datenaustausch auf130mm (5,25in) Disketten mittels modifizierter Frequenzmodulationsaufzeichnung bei7958ftprad, 3,8tpmm (96tpi), auf beiden Seiten. Teil1: Mechanische physikalische und Grss
26、enanforderungen (ISO8378-1, 1Ausgabe, 1986) This European Standard was approved by CEN on1988-12-21. 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
27、-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 und
28、er 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, Netherl
29、ands, 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 1989 Copyright reserved to all CEN members Ref. No. EN28378-1:1
30、989EEN28378-1:1989 BSI 12-1999 2 Brief history The Technical Board has decided to submit the International Standard ISO8378-1, 1st edition1986 “Information processing; Data interchange on130mm (5,25in) flexible disk cartridges using modified frequencymodulation recording at7958ftprad,3,8tpmm (96tpi)
31、 on both sides; Part1: Dimensional, physical and magnetic characteristics” to the formal vote. The result of this vote was positive. For the time being, this document exists only in the English and the French versions. According to the CEN/CENELEC Common Rules, the following countries are bound to i
32、mplement this standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Statement The text of the International Standard ISO8378-1, 1st edition, 1986, was approved by CEN a
33、s a European Standard without any modification.EN28378-1:1989 BSI 12-1999 3 0 Introduction ISO8378 specifies the characteristics of130mm(5.25in) flexible disk cartridges recorded at7958ftprad, 3,8tpmm (96tpi), using modified frequency modulation (MFM) recording on80tracks on each side. ISO8378-2 and
34、 ISO8378-3 each specify the quality of recorded signals, the track layout, and a track format to be used on130mm (5.25in) flexible disk cartridges, intended for data interchange between data processing systems. ISO8378-1 and ISO8378-2, together with the labelling scheme specified in ISO7665, provide
35、 for full data interchange between data processing systems. ISO8378-1 and ISO8378-3, together 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 ISO8378 specifies the dimensional, physical a
36、nd magnetic characteristics of the cartridge so as to provide physical interchangeability between data processing systems. NOTENumeric values in the SI and/or Imperial measurement system in this part of ISO8378 may have been rounded off and therefore are consistent with, but not exactly equal to, ea
37、ch other. Either system may be used, but the two should 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 ISO8378 when it meets all the requ
38、irements of this part of ISO8378 and all those of either ISO8378-2 or ISO8378-3. 3 References ISO 7665, Information processing File structure and labelling of flexible disk cartridges for information interchange. ISO 8378, Information processing Data interchange on130mm (5.25in) flexible disk cartri
39、dges using modified frequency modulation recording at7958ftprad, 3,8tpmm (96tpi), on both sides Part 2: Track format A; Part 3: Track format B. ISO 9293, Information processing Volume and file structure of flexible disk cartridges for information interchange. 4 Definitions For the purpose of this pa
40、rt of ISO8378 the following definitions apply. 4.1 flexible disk 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 reference flexible disk cartridge a flex
41、ible disk cartridge arbitrarily selected for a given property for calibrating purposes 4.3 secondary reference flexible disk cartridge a flexible disk cartridge intended for routine calibrating purposes, the performance of which is known and stated in relation to that of the reference flexible disk
42、cartridge 4.4 signal amplitude reference flexible disk cartridge a reference flexible disk cartridge selected as a standard for recording field and signal amplitude NOTEA master standard for signal amplitudes, reference fields, overwrite and resolution characteristics has been established by the Phy
43、sikalisch-Technische Bundesanstalt (PTB) Bundesallee100in Braunschweig, Germany, F.R. Secondary reference flexible disk cartridges can be ordered from PTB Lab1.41 under part number RM7487 as long as available. 4.5 typical field (for each side) the minimum recording field, which, when applied to a fl
44、exible disk cartridge, causes a signal output equal to95% of the maximum average signal amplitude when taken as a function of the recording field at the specified track and flux transition frequency of that flexible disk cartridge 4.6 reference field the typical field of the signal amplitude referen
45、ce flexible disk cartridge 4.7 test recording current (for each side) the current between145% and155% of the current which produces the reference field at125000flux transitions per second (ftps) on track00 on both sidesEN28378-1:1989 4 BSI 12-1999 4.8 standard reference amplitude (SRA) (for each sid
46、e) the average signal amplitudes derived from the reference tracks on the signal amplitude reference flexible disk cartridge using the appropriate test recording current SRA 1fis the average signal amplitude from a recording written using125000ftps SRA 2fis the average signal amplitude from a record
47、ing written using250000ftps 4.9 average signal amplitude the arithmetically averaged value for a track of the output voltages measured peak-to-peak over the whole track 4.10 in-contact an operating condition in which the magnetic surface of the disk intended for data storage is in physical contact w
48、ith the magnetic heads 4.11 formatting writing the proper control information, establishing the physical tracks, and designating the addresses of physical records on the flexible disks surfaces 4.12 initialization writing the volume label, the ERMAP label and other information initially required to
49、be on the flexible disk cartridge prior to the commencement of general processing or use 4.13 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 toFigure 3 as follows: 5.2 Main elements The main elements of this flexible disk cartridge are the recording disk; the liner; the jacket. The cartridge is stored in an envelope. 5.3 Description The jacket is of a square
