ANSI INCITS ISO IEC 7487-1-1993 Information technology - Data interchange on 130 mm (5 25 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad.pdf

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1、 INCITS/ISO/IEC 7487-1:19932010 (ISO/IEC 7487-1:1993, IDT) Information technology - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad, 1,9 tpmm (48 tpi), on both sides - ISO type 202 - Part 1: Dimensional, physical and mag (TI

2、TLE TRUNCATED) Reaffirmed as INCITS/ISO/IEC 7487-1:1993 R2015INCITS/ISO/IEC 7487-1:19932010 PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are

3、licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details

4、of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relat

5、ing to it is found, please inform the Central Secretariat at the address given below. Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard. Date of ANSI Approval: 10/6/2010 Published by American National Standards Institute, 25 West 43rd S

6、treet, New York, New York 10036 Copyright 2010 by Information Technology Industry Council (ITI). All rights reserved. These materials are subject to copyright claims of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Inst

7、itute (ANSI), and Information Technology Industry Council (ITI). Not for resale. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1101

8、 K Street NW, Suite 610, Washington DC 20005. Printed in the United States of America ii ITIC 2010 All rights reserved Q ISO/IEC Foreword IS0 (the International Organization for Standardization) and IEC (the Inter- national Electrotechnical Commission) form the specialized system for worldwide stand

9、ardization. National bodies that are members of IS0 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. IS0 and IEC technical com- mittees collaborate in fields

10、of mutual interest. Other international organ- izations, governmental and nongovernmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted b

11、y the joint technical committee are circulated to national bodies for vot- ing. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 7487-l was prepared by Joint Technical Committee ISO/IEC JTC 1, Informatio

12、n technology, Subcommittee SC 11, Flexible magnetic media for digital data interchange. This second edition cancels and replaces the first edition (IS0 7487-l :1985), of which it constitutes a technical revision. ISO/IEC 7487 consists of the following parts, under the general title In- formation tec

13、hnology - Data interchange on 130 mm 625 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad, 1,9 rpmm (48 tpil, on both sides - IS0 type 202: - Part 1: Dimensional, physical and magnetic characteristics - Part 2: Track format A - Part 3: Track format B Annexes

14、 A, B and C form an integral part of this part of ISO/IEC 7487. Annexes D and E are for information only. . . . III ISO/IEC 7497-1:1993(E) Q ISO/IEC Introduction lSO/lEC 7487 specifies the characteristics of 130 mm (5,25 in) flexible disk cartridges recorded at 7 958 ftprad, 1,9 tpmm (48 tpi), on bo

15、th sides using modified frequency modulation recording. IS0 7487-2 and IS0 7487-3 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

16、 labelling scheme specified in IS0 7665, ISO/IEC 7487-l and IS0 7487-2 provide for a full data interchange between data process- ing systems. Together with the labelling scheme specified in IS0 9293, lSO/lEC 7487-l and IS0 7487-3 provide for another full data interchange between data processing syst

17、ems. In accordance with lSO/lEC 9983, flexible disk cartridges conforming to this part of lSO/lEC 7487 should be designated as “IS0 type 202”. INTERNATIONAL STANDARD CJ KMEC ISO/IEC 7497-1:1993(E) Information technology - Data interchange on 130 mm (5,25 in) flexible disk cartridges using modified f

18、requency modulation recording at 7 958 ftprad, I,9 tpmm (48 tpi), on both sides - IS0 type 202 - Part 1: Dimensional, physical and magnetic characteristics 1 Scope This part of lSO/lEC 7487 specifies the dimensional, physical and magnetic characteristics of the cartridge so as to provide physical in

19、terchangeability between data processing systems. 2 Conformance A flexible disk cartridge shall be in conformance with IS0 7487 when it meets all the requirements of lSO/lEC 7487-l and those of either IS0 7487-2 or IS0 7487-3. NOTE 1 Numeric values in the SI and/or Imperial measurement system in thi

20、s International Standard 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 recon- verted. The original design was made using Imperial units and further developments were made usin

21、g SI units. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of lSO/lEC 7487. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements b

22、ased on this part of lSO/lEC 7487 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 7487-2: 1985, Information processing - Data interchange on

23、130 mm (5.25 in) flexible disk car- tridges using modified frequency modulation record- ing at 7 958 ftprad, 1,9 tpmm (48 tpi), on both sides - Part 2: Track format A. IS0 7487-3:1986, Information processing - Data interchange on 730 mm (5.25 in) flexible disk car- tridges using modified frequency m

24、odulation record- ing at 7 958 ftprad, 1,9 tpmm (48 tpi,J, on both sides - Part 3: Track format B. IS0 7665:1983, Information processing - File struc- ture and labelling of flexible disk cartridges for infor- mation interchange. IS0 9293: 1987, Information processing - Volume and file structure of f

25、lexible disk cartridges for infor- mation interchange. 4 Definitions For the purposes of this part of lSO/lEC 7487, the following definitions apply. 4.1 flexible disk: A flexible disk which accepts and retains on the specified side or sides magnetic signals 1 ISO/IEC 7487-1:1993(E) 0 ISO/IEC intende

26、d for input/output and storage purposes of in- formation data processing and associated systems. 4.2 master standard reference flexible disk car- tridge: A reference flexible disk cartridge selected as the standard for reference fields, signal amplitudes, resolution, and overwrite. Track 00 and Trac

27、k 39 on each side are defined as reference tracks. NOTE 2 The Master Standard has been established by the Physikalisch-Technische Bundesanstalt (PTB), Bundes- allee 100, D-38023 Braunschweig, Germany. 4.3 secondary standard reference flexible disk cartridge: A flexible disk cartridge, the performanc

28、e of which is known and stated in relation to that of the master standard reference flexible disk cartridge. NOTE 3 Secondary standard reference flexible disk car- tridges may be ordered from PTB Lab 1.41 under part number RM 7487, as long as available. It is intended that these be used for calibrat

29、ing tertiary cartridges for use in routine calibrations. 4.4 typical field (for each side): The minimum re- cording field, which, when applied to a flexible disk cartridge, causes a signal output equal to 95 % of the maximum average signal amplitude when taken as a function of the recording field at

30、 the specified track and flux transition frequency of that flexible disk car- tridge. 4.5 reference field: The typical field of the signal amplitude reference flexible disk cartridge. There are two reference fields, one for each side. 4.6 test recording current (for each side): The cur- rent between

31、 145 YO and 155 % of the current which produces the reference field at 125 000 flux tran- sitions per second (ftps) on track 00 on both sides. 4.7 standard reference amplitude (SRA) (for each side): The average signal amplitudes derived from the reference tracks of the master standard reference flex

32、ible disk cartridge using the appropriate test re- cording current. SRAt is the average signal amplitude from a recording written using 125 000 ftps V;). SRA2 is the average signal amplitude from a recording written using 250 000 ftps - the liner; - the jacket. The cartridge is stored in an envelope

33、. 5.3 Description The jacket is of a square form. It includes a central window, an index window and a head window in both sides. The liner is fixed to the inside of the jacket. It com- prises two layers of material between which the disk is held. The liner has the same openings as the jacket. The di

34、sk has only a central window and an index window. 5.4 Optional features The interchange characteristics of the cartridge allow for variations in its construction, as follows: - the jacket may include flaps (for example three flaps as shown in the figures, or none); 2 0 ISO/IEC ISO/IEC 7487-1:1993(E)

35、 - the jacket may include notches along the refer- ence edge; - the centre of the disk may be reinforced by hub support rings (see annex D). A-A Liner Jacket Disk Flap Liner 1 Side 1 L Jacket Central window Index window - Side 0 - Jacket I A - Head window Figure 1 - Flexible disk cartridge 3 ISO/IEC

36、 7497-1:1993(E) o ISO/IEC Label area Figure 2 - Protective envelope with cartridge o lSO/IEC ISO/IEC 7487-1:1993(E) 1 Referenceedge 42 -I I I Figure 3 - Jacket dimensions The temperature and the relative humidity shall be measured in the air immediately surrounding the car- tridge. The stray magneti

37、c field at any point on the disk sur- face, including that resulting from the concentrating effect of the recording head, shall not exceed 4 000 A/m (50 Oe). 6 General requirements 6.1 Environment and transportation 6.1.1 Testing environment Tests and measurements made on the cartridge to check the

38、requirements of this International Standard shall be carried out under the following conditions: 6.1.2 Operating environment - temperature: 23 “C of: 2 “C (73 “F f 4 “F); Cartridges used for data interchange shall be operated under the following conditions: - relative humidity: 40 % to 60 %; - tempe

39、rature: 10 “C to 515 “C (50 “F to 125 “F); - conditioning before testing: 24 h minimum. - relative humidity: 20 % to 80 %; 5 ISO/IEC 7487-1:1993(E) 0 ISO/IEC - wet-bulb temperature: less than 29 “C (84 “F). The temperature and the relative humidity shall be measured in the air immediately surroundin

40、g the car- tridge. It is recommended that the rate of change of the temperature should not exceed 20 “C (68 “F) per hour. There shall be no deposit of moisture on or in the cartridge. The stray magnetic field at any point on the disk sur- face, including that resulting from the concentrating effect

41、of the recording head, shall not exceed 4 000 A/m (50 Oe). 6.1.3 Storage environment During storage the cartridges shall be kept under the following conditions: - maximum rate of temperature change: 20 “C (68 OF) per hour; - relative humidity: 8 % to 90 %. To be measured only when temperature is 5 “

42、C (41 “F) or greater. There should be no deposit of moisture on or in the cartridge. 6.1.5 Handling The cartridge shall remain out of its envelope for the shortest time possible. When handling the cartridge the operator shall not touch the exposed magnetic surfaces of the disk and shall avoid exposi

43、ng the car- tridge to direct sunlight, moisture and dust. 6.2 Materials 6.2.1 Jacket - temperature: 4 “C to 51,5 “C (40 “F to 125 “F); - relative humidity: 8 % to 80 %. Each cartridge shall be in an envelope and in an up- right position. There shall be no deposit of moisture on or in the cartridge.

44、The ambient stray magnetic field at any point on the disk surface shall not exceed 4 000 A/m (50 Oe). NOTE 4 Cartridges which have been stored at tempera- tures and humidities outside the operating conditions can exhibit degraded performance characteristics. Such car- tridges should be subjected to

45、a conditioning period of not less than 24 h within the operating environment prior to use. 6.1.4 Transportation Responsibility for ensuring that adequate precautions are taken during transportation shall be with the sender. During transportation the cartridge shall be in its envelope and in a protec

46、tive package. The latter shall be free from dust or extraneous matter. It shall have a clean interior and construction to minimize ingress of dust and moisture. It is recommended that a sufficient space exists between cartridge and outer surface of the final container so that risk of damage due to s

47、tray magnetic fields will be negligible. It is recommended that the following conditions are not exceeded: - temperature: -40C to 51,5”C (-40F to 125 “F); The jacket may be constructed from any suitable ma- terial (for example, vinyl chloride sheet). 6.2.2 Liner The material of the liner shall be able to retain dust without damage to the disk (for example, nonwoven fabric). 6.2.3 Disk The disk may be constructed from any suitable ma- terial (for example, biaxially oriented polyethylene terephthalate) coated on both sides with a strong