1、BSI BS*ISO/IEC 1Oe1L) 92 3624669 03LL9L3 33T BRITISH STANDARD Implementation of ISO/IEC 10994 : 1992 Information technology - Data interchange on 90 rnrn flexible disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side - IS0 Type 303 UDC 81.387.634 BS
2、 ISO/IEC 10994 : 1992 BSI BS*ISO/IEC LO994 92 Lb24669 03L19L4 276 BS ISO/IEC 10994 : 1992 National foreword This British Standard reproduces verbatim ISO/IEC 10994 : 1992 and implements it as the UK national standard. This British Standard is published under the direction of the Information Systems
3、Technology Standards Policy Committee whose Technical Committee IST/4 has the responsibility to: - aid enquirers to understand the text; - present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; - monitor related in
4、ternational and European developments and promulgate them in the UK. NmE. International and European Standards, as well as overseas standards, are available from BSI Sales Department, BSI, Linford Wood, Milton Keynes, MK14 6LE. Compliance with a British Standard does not of itself confer immunity fr
5、om legal obligations. BSI BS*ISO/IEC 1099Y 92 m lb24bb7 0311935 102 m I NT E R NAT I O NA L STANDARD ISO/IEC First edition 1992-06-01 Information technology - Data interchange on 90 mm flexible disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side -
6、 IS0 Type 303 Technologies de linformation - change de donnes sur cartouche disquette de 90 mm utilisant un enregistrement a modulation de frquence modifie 31 831 ftprad, 80 pistes par face - IS0 Type 303 ISO/IEC 10994:1992 (E) Con tents Section 1 - General 1 2 3 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.
7、9 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 5 5. I 5.2 5.3 scope Conformance Normative references Definitions Average Signal Amplitude direction of rotation disk eraseability formatting hub in-contact Index initialization line of access liner Master Standard Reference Flexible
8、 Disk Cartridge Reference Erase Field Reference Field Secondary Standard Reference Flexible Disk Cartridge shutter Side Standard Reference Amplitude Test Erase Current Test Recordi ng Current Typical Field General description Drawings Main elements Description case Section 2 - Environments, mechanic
9、al and physical characteristics 6 General requirements 6.1 Environment and transportation 6.1.1 Testing environment 6.1.2 Operating environment 6.1.3 Storage environment 6.1.4 Transportation O ISOIIEC 1992 Ail rights reserved. No part of this publication may be reproduced or utilized in any form or
10、by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed In Switzerland ISO/IEC Copyright Office Case Postale 56 CH-I211 GenBve 20 Switzerland II Page 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 BSI BS*P
11、SO/IEC 10994 92 I Lb24bb9 03Ll1917 T85 ISO/LEC 10994:1992 (E) 6.2 Materials 6.2.1 CaSe 6.2.2 Liner 6.2.3 Disk 6.2.4 Hub 7 Dimensional characteristics 7.1 Case 7.1.1 Shape 7.1.2 Thick ness 7.1.3 Hub access hole 7.1.4 Locating holes 7.1.5 Label area 7.1.6 Head windows 7.1.7 Write-inhibit hole 7.1.8 id
12、entification hole 7.1.9 7.1.10 Shutter 7.2 Liner 7.3 Disk 7.3.1 Diameter 7.3.2 Thickness 7.4 Hub 7.4.1 Dimensions 7.4.2 Hub orientation holes 7.5 Optional handling notches 7.6 7.7 Compliance 8 Physical characteristics 8.1 Flammability 8.2 8.3 8.4 Torque 8.4.1 Starting torque 8.4.2 Seetion 3 - Unreco
13、rded flexible disk cartridge 9 Magnetic characteristics 9.1 Recording area 9.2 Track geometry 9.2.1 Number of tracks 9.2.2 Width of tracks 9.2.3 Track location 9.2.4 Track number 9.3 Functional testing 9.3.1 Surface tests 9.3.2 Track quality tests 9.3.3 Rejection criterion Section 4 - Recording meth
14、od and track format 10 General requirements 10.1 Mode of recording 10.2 Profile of the shutter edge of the case Interface between cartridge and drive Coefficient of linear thermal expansion of the disk Coefficient of linear hygroscopic expansion of the disk Running torque without heads loaded Track
15、location tolerance of the recorded flexible disk cartridge 5 5 5 5 5 5 5 5 5 6 6 6 7 7 7 8 8 8 9 9 9 9 9 9 10 io 10 11 11 11 11 11 11 11 11 11 11 11 11 11 11 12 12 12 13 14 14 14 14 14 iii BSI BS*ISO/IEC LO994 92 Lb24bb9 031L91B 911 D ISODEC 1994:1992 (E) 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 10.
16、1 1 10.12 10.13 11 11.1 11.2 11.2.1 11.2.2 11.3 11.4 i 1.4.1 11.4.2 1 1.4.3 11.5 11.6 12 12.1 12.2 Recording offset angle Density of recording Flux transition spacing Average Signal Amplitude Byte Sector Cy I i nder Cylinder number Data capacity of a track Hexadecimal notation Error Detection Charac
17、ters (EDC) Track layout Index Gap Sector Identifier Identifier Mark Address Identifier Identifier Gap Data Block Data Mark Data Field EDC Data Block Gap Track Gap Coded representation of data Byte coding Bit coding Annexes A - Test for compliance B - Measurement of light transmittance C - Method for
18、 measuring the effective track width D - Procedure and equipment for measuring flux transition spacing E - Data separators for decoding MFM recording F - EDC implementation G - Cartridge distortion test gauge H - Method for measuring peak shift J - Head and read amplifier for functional testing K -
19、Procedure for determining test recording current and test erase current 14 15 15 16 16 16 16 16 16 16 17 17 17 17 17 18 18 18 19 19 19 19 19 19 19 20 26 28 31 32 34 35 36 37 41 43 iv BSI BS*ISO/IEC 10994 92 m 3b24bb9 0311919 858 m ISO/IEC 10994:1992 (E) Foreword IS0 (the International Organization f
20、or Standardization) and IEC (the international Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of International Standards through technical committees established by the respective o
21、rganization to deal with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non- governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information tec
22、hnology, IS0 and IEC have established a joint technical committee, ISOiEC JTCI. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies cast
23、ing a vote. International Standard ISO/IEC 10994 was prepared by the European Computer Manufacturers Association (as Standard ECMA-147) and was adopted, under a special “fast-track procedure“, by Joint Technical Committee ISODEC JTCI, Information technology, in parallel with its approval by national
24、 bodies of IS0 and IEC. Annexes A to D and G to K form an integral part of this International Standard. Annexes E and F are for information only. V BSI BS*ISO/IEC 10994 92 E 1624bb9 0311920 57T I INTERNATIONAL STANDARD ISO/IEC 10994:1992 (E) Information technology - Data interchange on 90 mm flexibl
25、e disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side - IS0 Type 303 Section 1 - General 1 scope This International Standard specifies the characteristics of 90 mm flexible disk cartridges recorded at 31 831 ftprad using modified frequency modulat
26、ion recording, on 80 tracks on each side. Such flexible disk cartridges are identified as IS0 Type 303. It specifies the mechanical, physical and magnetic characteristics of the cartridge, so as to provide physical inter- changeability between data processing systems. It also specifies the method of
27、 recording, the quality of the recorded signals, the track layout and the track format. Together with IS0 9293, this International Standard piovides for full data interchange between data processing systems. 2 Conformance A 90 mm flexible disk cartridge is in conformance with this International Stan
28、dard if it meets all mandatory requirements specified herein. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards ar
29、e subject to revision, and parties to agreements based on this International Standard 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 683-13:
30、1986 - Heat-treatable steels, alloy steels and free-cutting steels - Part 13: Wrought stainless steels IS0 8860-1:1987 - informariori processing - Data interchange on 90 mm (3.5 in) flexible disk cartridges using modified frequency modulation recording at 7 958 ftprad on 80 tracks on each si - Figur
31、e 9 - Figure 10 shows the disk with hub; - Figure 11 5.2 Main elements The main elements of the flexible disk cartridge are shows side O and en.arged cross-sections through the .ation holes; shows at a larger scale the upper part of Side O without shutter; shows the interface between the cartridge a
32、nd the drive. - the disk, - the liner, - the case. 5.3 Description The cartridge is of a substantially square form. It includes a central hole on one side, a head window on both sides, an identification hole and a write-inhibit hole. The liner is provided between the case and the disk. It comprises
33、two layers of material between which the disk lies. The disk has a central hole with a metal hub attached. BSI BS*ISO/IEC LO994 92 m Lb24bbS 0333923 289 ISODEC 10994:1992 (E) Section 2 - Environments, mechanical and physical characteristics 6 General requirements 6.1 Environment and transportation 6
34、.1.1 Testing environment Tests and measurements made on the cartridge to check the requirements of this International Standard shall be temperature relative humidity condition i ng before testing carried out under the following conditions: : 23 “C f 2 “C : 40 % to 60 % : 24 h minimum For the tests s
35、pecified in 9.3 Le temperature and the relative umidity shall be measured in the air immei iately surrounding the cartridge drive. For all other tests the temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. The stray magnetic field at any point o
36、n the disk surface, including that resulting from the concentrating effect of the recording head, shall not exceed 4 O00 Nm. 6.1.2 Operating environment Cartridges used for data interchange shall be operated under the following conditions: tem peratu re relative humidity wet bulb temperature : 10 “C
37、 to 51,5 “C : 20 % to 80 % : less than 29 “C The temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. It is recommended that the rate of change of the temperature should not exceed 20 “C per hour. It is also recommended that the temperature and th
38、e relative humidity conditions when reading a cartridge are not at the opposite extremes to the conditions when it was recorded. There shall be no deposit of moisture on or in the cartridge. The stray magnetic field at any point on the disk surface, including that resulting from the concentrating ef
39、fect of the recording head, shall not exceed 4 O00 Alm. 6.1.3 Storage environment During storage the cartridges shall be kept within the following conditions: temperature relative humidity :8%to90% : 4 “C to 53 “C The ambient stray magnetic field shall not exceed 4 O00 Alm. There shall be no deposit
40、 of moisture on or in the cartridge. NOTE 3 - Cartridges which have been stored at temperatures and humidities exceeding the operating conditions may exhibit degraded performance characteristics. Such cartridges should be subjected to a conditioning period of not less than 24 h within the operating
41、envi- ronment prior to use. 6.1.4 Transportation Responsibility for ensuring that adequate precautions are taken during the transportation shall be with the sender. The cartridge shall be in a protective package free from dust or extraneous matter. It is recommended that a 4 BSI BS*ISO/IEC I10994 92
42、 E Lb24bb 03ll24 lL5 E 1 sufficient space exists between cartridge and outer surface of the final container, so that risk of erasure due to stray magnetic fields will be negligible. It is recommended that the following conditions are not exceeded: I temper at u re : -40 “C to 60 “C I maximum rate of
43、 1 temperature change relative humidity :8%toW% : 20 “C per hour , 1 6.2.1 Cae There should be no deposit of moisture on or in the cartridge. 6.2 Materials ISOAEC 10994:1992 (E) 7 Dimensional characteristics The dimensions of the cartridge are referred to two Reference Axes X and Y. They are two lin
44、es in space intersecting at right angles. The plane they define is the Reference Plane XY of the cartridge. 7.1 Case 7.1.1 Shape (figure 7) The case has a rectangular form, its sides shall be LI = 94,O mm ? 0,3 mm + 0,4 - 0,l L2 = 90,Omm mm The radius of three of its corners shall be RI = 2,O mm I 1
45、,0 mm The angle of its fourth corner shall be i , 7.1.2 Thickness o = 45“ 2 2“ I In the area extending 8.5 mm from each of the two edges as shown in figure 8, the thickness of the case shall be El = 3,3 mm I 0,2 mm I The case may be constructed from any suitable material such that it meets the requi
46、rements of 7.7. 6.2.2 Liner The material of the liner shall be able to retain dust or debris without damage to the disk. 6.2.3 Disk The disk may be constructed from any suitable material (e.g. bi-axially oriented polyethylene terephthalate) coated on both sides with a flexible layer of magnetic mate
47、rial (e.g. barium ferrite). 6.2.4 Hub The hub shall be made of any suitable material (e.g. stainless steel alloy according to IS0 683-13, type 8). l When the cartridge is inserted in the test gauge specified in annex G, a force of 0,2 N maximum, applied to the centre of the back edge shall cause the
48、 cartridge to pass through the gauge. I 5 BSI BS*ISO/IEC LO994 92 lb24bb 03LL925 051 ISO/IEC 10994:1992 (E) The edge radius shall be R2 = 0.40 mm I 0.25 mm 7.1.3 Hub access hole (figure 7) On Side O there shall be a hub access hole the diameter of which shall be Dl = 26.50 mm min. The position of th
49、e centre of this hole shall be defined by L3 = 40.00 mm I 0,15 mm L4 = 31,00 mm 1: 0,15 mm 7.1.4 Locating holes (figures 7 and 9) 1 7.1.4.1 Primary locating hole , The centre of the primary locating hole shall be at the intersection of Reference Axes X and Y. Its diameter shall be 02 = 3,6 mm I 0.1 mm The dimensions of its section (see cross-section A-A in figure 7) shall be D3 = 1.5 mm min. L8 = 0,2 mm k O, mm Ls, = 1,0 rnm min. Llo= 2,5 mm min. 7.1.4.2 Secondary locating hole The centre of the secondary locating hole shall be on Reference Axis X, its distance from R
