1、INTERNATIONAL STANDARD ISOIIEC 10994 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 - IS0 Type 303 Technologies de /information - khange de donnees sur carto
2、uche B disquette de 90 mm utilisant un enregistrement A modulation de frequence modifiee B 31 831 ftprad, 80 pistes par face - IS0 Type 303 Reference number ISO/IEC 10994: 1992(E) Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard.Date o
3、f ANSI Approval: 6/6/97Published by American National Standards Institute,25 West 43rd Street, New York, New York 10036Copyright 2002 by Information Technology Industry Council (ITI).All rights reserved.These materials are subject to copyright claims of International Standardization Organization (IS
4、O), InternationalElectrotechnical Commission (IEC), American National Standards Institute (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, withoutthe prior written permission
5、 of ITI. All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaISO/IEC 10994:1992 (E) Contents Page Section 1 - General 1 scope 2 Conformance 3 Normative references 4 Definitions 4.1 Average Signal Amplitud
6、e 4.2 case 4.3 direction of rotation 4.4 disk 4.5 eraseability 4.6 formatting 4.7 hub 4.8 in-contact 4.9 Index 4.10 initialization 4.11 line of access 4.12 liner 4.13 Master Standard Reference Flexible Disk Cartridge 4.14 Reference Erase Field 4.15 Reference Field 4.16 Secondary Standard Reference F
7、lexible Disk Cartridge 4.17 shutter 4.18 Side 4.19 Standard Reference Amplitude 4.20 Test Erase Current 4.21 Test Recording Current 4.22 Typical Field 5 General description 5.1 Drawings 5.2 Main elements 5.3 Description Section 2 - Environments, mechanical and physical characteristics 6 General requ
8、irements 6.1 Environment and transportation 6.1.1 Testing environment 6.1.2 Operating environment 6.1.3 Storage environment 6.1.4 Transportation 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 4 4 4 4 4 4 4 0 ISO/IEC 1992 All rights reserved. No part of this publication may be reproduc
9、ed or utilized in any form or by any means, electronic or mechanical, including photocopylng and microfilm, without permission In writing from the publisher. ISO/IEC Copyright Office l Case Postale 56 l CH-1211 Geneve 20 l Swltzerland Printed In Switzerland ii ISO/IEC 10994:1992 (E) 6.2 Materials 6.
10、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 Thickness 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 Identification hole 7.1.9 Profile of the shutter edge of the case 7.1.10 Shutter
11、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 Interface between cartridge and drive 7.7 Compliance 8 Physical characteristics 8.1 Flammability 8.2 Coefficient of linear thermal expansion of the disk 8.3 Coeffi
12、cient of linear hygroscopic expansion of the disk 8.4 Torque 8.4.1 Starting torque 8.4.2 Running torque without heads loaded Section 3 - Unrecorded 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 locati
13、on 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 S - Figure 8 shows Side 1; - Figure 9 shows at a larger scale the upper part of Side 0 without shutter; - Figure 10 shows the disk with hub; - Figure 11 shows the interface between th
14、e cartridge and the drive. 5.2 Main elements The main elements of the flexible disk cartridge are - 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 wr
15、ite-inhibit hole. The liner is provided between the case and the disk. It comprises two layers of material between which the disk lies. The disk has a central hole with a metal hub attached. ISO/IEC 10994:1992 (E) Section 2 - Environments, mechanical and physical characteristics 6 General requiremen
16、ts 6.1 Environment and transportation 6.1.1 Testing environment Tests and measurements made on the cartridge to check the requirements of this International Standard shall be carried out under the following conditions: temperature : 23 “C + 2 “C relative humidity : 40 % to 60 % conditioning before t
17、esting : 24 h minimum For the tests specified in 9.3 the temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge drive. For all other tests the temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. T
18、he stray magnetic field at any point on the disk surface, including that resulting from the concentrating effect of the recording head, shall not exceed 4 000 A/m. 6.1.2 Operating environment Cartridges used for data interchange shall be operated under the following conditions: temperature : 10 “C t
19、o 51,s “C relative humidity : 20 % to 80 % wet bulb temperature : 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 re
20、commended that the temperature and the 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 tha
21、t resulting from the concentrating effect of the recording head, shall not exceed 4 000 A/m. 6.1.3 Storage environment During storage the cartridges shall be kept within the following conditions: temperature : 4 “C to 53 “C relative humidity : 8 % to 90 % The ambient stray magnetic field shall not e
22、xceed 4 000 A/m. There shall be no deposit 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 o
23、f not less than 24 h within the operating 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 rec
24、ommended that a 4 ISO/IEC 10994:1992 (E) 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: temperature : -40 “C to 60 “C maximu
25、m rate of temperature change : 20 “C per hour relative humidity : 8 % to 90 % There should be no deposit of moisture on or in the cartridge. 6.2 Materials 6.2.1 Case The case may be constructed from any suitable material such that it meets the requirements of 7.7. 6.2.2 Liner The material of the lin
26、er 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. biaxially oriented polyethylene terephthalate) coated on both sides with a flexible layer of magnetic material (e.g. barium ferrite). 6.2.4 Hub The hub shall
27、be made of any suitable material (e.g. stainless steel alloy according to IS0 683-13, type 8). 7 Dimensional characteristics The dimensions of the cartridge are referred to two Reference Axes X and Y. They are two lines in space intersecting at right angles. The plane they define is the Reference Pl
28、ane XY of the cartridge. 7.1 case 7.1.1 Shape (figure 7) The case has a rectangular form, its sides shall be Ll = 94.0 mm f 0.3 mm + 0,4 L2 = 90.0 mm mm - 0,l The radius of three of its corners shall be RI = 2,0 mm + 1,O mm The angle of its fourth corner shall be w = 45” + 2” 7.1.2 Thickness In the
29、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 + 0,2 mm 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 cartridge to pass thr
30、ough the gauge. 5 ISO/IEC 10994:1992 (E) The edge radius shall be R2 = 0.40 mm f 0.25 mm 7.1.3 Hub access hole (figure 7) On Side 0 there shall be a hub access hole the diameter of which shall be Dt = 26.50 mm min. The position of the centre of this hole shall be defined by L3 = 40.00 mm + 0,15 mm L
31、4 = 31,00 mm f 0.15 mm 7.1.4 Locating holes (figures 7 and 9) 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 f 0.1 mm The dimensions of its section (see cross-section A-A in figure 7) sha
32、ll be 03 = 1,5 mm min. d!4 = 0,2 mm k o,l mm 4 = 1,O mm 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 Reference Axis Y shall be Ls = 80,O mm f 0.2 mm It shall have a substantially rectangular shape. Its
33、 short axis shall be (cross-section B-B in figure 7) Lb = 3.6 mm f 0.1 mm Its long axis shall be L7 = 4,4 mm * 0,2 mm The dimensions D3, Lg, L9 and Llo of the cross-section of the secondary locating hole are as specified in 7.1.4.1. 7.1.5 Label area 7.1.5.1 Side 0 (figure 7) The locations and dimens
34、ions of the label area of Side 0 shall be defined by Lll = 3.5 mm min. L12 = 76.5 mm max. L14 = 60.0 mm min. 7.1.5.2 Side 1 (figure 8) The locations and dimensions of the label area of Side 1 shall be defined by L1, = 3.5 mm min. 6 ISOAEC lO!B4:1992 (E) L12 = 76.5 mm max. L13 = 20.0 mm min. 7.1.6 He
35、ad windows (figure 9) The locations and the dimensions of the two head windows are specified by the same set of dimensions. 7.1.6.1 Location The location of the head windows shall be defined by L15 = 12.3 mm min. Llh = 11.5 mm min. L17 = 35.5 mm + 0.2 mm 7.1.6.2 Dimensions The width of the head wind
36、ows shall be L18 = 9,00 mm f 0,20 mm The radius of their corners shall be R3 = 0,5 mm + 0,l mm The radius of their upper edge shall be R4 = 0,5 mm + 0,l mm 7.1.7 Write-inhibit hole (figure 8) 7.1.7.1 Location The centre of the write-inhibit hole shall be on Reference Axis Y. Its distance from Refere
37、nce Axis X shall be L19 = 67.75 mm f 0,25 mm 7.1.7.2 Dimensions The dimensions of the write-inhibit hole shall be L20 = 3,5 mm min. L21 = 4.0 mm min. 7.1.7.3 use The write-inhibit hole is intended for use either with a mechanical switch or with an optical detector so that only when the hole is cover
38、ed is writing on the disk possible. When covered, the closure device shall not extend outside the Reference Plane nor shall it deflect by more than 0.3 mm from the Reference Plane inside the case under the action of a force of 3 N. Also when covered, the light transmittance of the write-inhibit hole
39、 area shall not exceed 1 %, when measured with an optical system as described in annex B. 7.1.8 Identification hole (figures 7 and 8) The identification hole is provided to distinguish between the flexible disk cartridge specified by this International Standard from those specified by IS0 8860 and I
40、SO/IEC 9529. NOTE 4 - As no specification is given in IS0 8Hho and lSO/lEC 9529 for the opacity of the case, it is recommended that detection of the identification hole is by mechanical means. ISO/JJW 10994:1992 (E) 7.1.8.1 Location The position of the centre of the identification hole shall be spec
41、ified by Lg and L51 = 62.25 mm f 0.25 mm 7.1.8.2 Dimensions The dimensions of the identification hole shall be L49 = 3,5 mm min. ho = 4.0 mm min. 7.1.9 Profile of the shutter edge of the case (figures 7 and 9) The edge on which the shutter is mounted shall have a profile defined by the following dim
42、ensions: L22 = 80,O mm + 0.2 mm L23 = 76.0 mm f 0.3 mm L24 = 68.0 mm + 0,3 mm L25 = 64.50 mm f 0,35 mm La = 57,00 mm f 0.35 mm Ln = 55.5 mm f 0,6 mm La = 3,5 mm min. LB = 17.5 mm * 0.2 mm L30 = 17.00 mm f 0.15 mm L31 = 15.50 mm f 0.25 mm L 45 = 12,50 mm + 0,25 mm a = 45“ 2 2“ P= 135” f 2” 0 = 45” +
43、2” 7.1.10 Shutter (figures 8 and 9) The shutter shall slide upon insertion of the cartridge into the drive so as to uncover the head windows, and close automatically upon removal. The maximum resistance force at the fully open position shall be 1 N, and the minimum resistance force at the fully clos
44、ed position shall be 0.2 N. The path along which the shutter can slide is defined by L25 and L28. In the open position of the shutter, the distance from its leading edge to the Reference Axis Y shall be L32 = 53.75 mm + 1.25 mm The width of the windows of the shutter shall be L33 = 12.0 mm f 0.2 mm
45、NOTE 5 - It is a requirement that the drive shall provide a mechanism whereby correct insertion of the cartridge into the drive causes the shutter to slide so as to uncover tbe head windows. 7.2 Liner No part of the liner shall protrude by more than 0.2 mm into the head access windows. ISO/IEC 10994
46、:1992 (E) 7.3 Disk (figure 10) 7.3.1 Diameter The diameter of the disk shall be D4 = 85.8 mm f 0.2 mm 7.3.2 Thickness The thickness of the disk shall be E2 = 0,080 mm + 0,008 mm 7.4 Hub (figure 10) The hub shall have a central part and a flange. 7.4.1 Dimensions The diameter of the central part shal
47、l be + 0.00 D5 = 25.00 mm mm - 0,15 The diameter of the flange shall be 06 = 31,15 mm max. The distance from the surface of the central part of the hub to the surface of Side 0 of the disk shall be L34 = 1.36 mm f 0.10 mm when measured at a radius R7 R7 = 14 mm nominal 7.4.2 Hub orientation holes (f
48、igure 10) The hub shall have two orientation holes. The first one at its centre, the second off centre. 7.4.2.1 First orientation hole The first orientation hole shall have a square form defined by L35 = 4.00 mm min. The position of the centre of rotation of the disk is defined by L36 = 1,9955 mm me
49、asured from two sides of the hole. This centre of rotation shall be within 0.5 mm of the geometric centre of the disk. The radius of the four corners of this hole shall be R5 = 1.0 mm f 0.3 mm 7.4.2.2 Second orientation hole The position and dimensions of the sides of the rectangular second orientation hole are referred to two radial Reference Lines A and B that are perpendicular to each other. Their positions shall be specified by Y = 15” ?r 3” The length of the sides of this hole shall be L37 = 8.0 mm + 0.3 mm 9 ISODEX 10994:1992 (E) 48 = 4,5 mm min. These sides shall be parallel to lines A
