1、 INCITS/ISO 8860-1:19872010 (ISO 8860-1:1987, IDT) Information 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 side - Part 1 : Dimensional, physical and magnetic characteristics Reaffirmed as
2、INCITS/ISO/IEC 8860-1:1987 R2015INCITS/ISO 8860-1:19872010 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 licensed to and installed on the
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5、 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 Street, New York, New York 10036 C
6、opyright 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 Institute (ANSI), and Information Tec
7、hnology 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 K Street NW, Suite 610, Washingt
8、on DC 20005. Printed in the United States of America ii ITIC 2010 All rights reserved IS0 8860-l : 1987 (El Contents Page 0 Introduction . 1 1 Scope and field of application 1 2 Conformance 1 3 References 1 4 Definitions 1 4.1 recordingdisk 1 4.2 hub 1 4.3 shutter 1 4.4 finer 1 4.5 case 1 4.6 Master
9、 Standard Reference Flexible Disk Cartridge 1 4.7 Secondary Standard Reference Flexible Disk Cartridge . 1 4.8 Typical Field . 2 4.9 ReferenceField 2 4.10 Test Recording Current. . 2 4.11 Standard Reference Amplitudes (SRAs) . 2 4.12 Average Signal Amplitude . 2 4.13 in-contact . 2 4.14 side 2 4.15
10、direction of rotation. 2 4.16 index . 2 4.17 formatting . 2 4.18 initialization. . 2 5 General description. 2 5.1 Figures 2 iii ISO8860-1 :1987 (EI 5.2 Mainelements 5.3 Description . 6 General requirements . 6.1 Environment and transportation . 6.2 Materials . 7 Dimensional characteristics 7.1 Case
11、7.2 Liner 7.3 Disk . 7.4 Hub . 7.5 Optional handling notches 7.6 Interface between cartridge and drive . 7.7 Compliance . 8 Physical characteristics . 8.1 Inflammability . 8.2 Coefficient of linear thermal expansion of the disk 8.3 Coefficient of linear hygroscopic expansion of the disk 8.4 Torque .
12、 9 Magnetic characteristics 9.1 Recordingarea 9.2 Trackgeometry . 9.3 Functional testing . Annexes A Testforcompliance 6 Measurement of light transmittance C Method for measuring the effective track width D Cartridge distortion test gauge . E Method for measuring peak shift . 2 2 2 2 3 3 3 5 5 5 6 6
13、 6 6 6 6 6 6 7 7 7 7 14 16 18 19 20 iv INTERNATIONAL STANDARD IS0 8860-l : 1987 (E) Information 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 side - Part 1 : Dimensional, physical and magnet
14、ic characteristics 0 Introduction IS0 9960 specifies the characteristics of 90 mm (3.5 in) flexible disk cartridges recorded at 7 959 ftprad using modified fre- quency modulation (MFM) recording on SO tracks on each side. IS0 9960-2 specifies the track layout, the track format and the characteristic
15、s of the recorded signals. IS0 9960-l and IS0 9960-2, together with the labelling scheme specified in IS0 9293, provide for full data interchange between data processing systems. 1 Scope and field of application This part of IS0 9960 specifies the dimensional, physical and magnetic characteristics o
16、f the cartridge, so as to provide physical interchangeability between data processing systems. NOTE - Numeric values in the SI and/or Imperial measurements system in this part of IS0 8860 may have been rounded off and therefore are consistent with, but not exactly equal to, each other. Either system
17、 may be used, but the two should be neither intermixed nor reconverted. The original design was made using SI units. 2 Conformance A 90 mm (3.5 in) flexible disk cartridge shall be in conformance with this part of IS0 9960 if it meets all mandatory requirements contained herein. 3 References IS0 693
18、-13, Heat-treated steels, alloy steels and free-cutting steels - Part 13 : Wrought stainless steels. IS0 9960-2, Information processing - Data interchange on 90 mm (3.5 in) flexible disk cartridges using modified frequency modulation recording at 7 959 ftprad on 80 tracks on each side - Part 2 : Tra
19、ck format. IS0 9293, Information processing - Volume and fife structure of flexible disk cartridges for information interchange. 4 Definitions For the purpose of this International Standard the following definitions apply. 4.1 recording disk : A flexible disk which accepts and re- tains, on the spec
20、ified side or sides, magnetic signals intended for input/output and storage purposes. 4.2 hub : A centring and referencing device attached to the centre of the disk which allows torque to be transmitted to the disk. It ensures centring of the disk on the drive shaft in a unique angular position. 4.3
21、 shutter : A device which uncovers the head windows upon insertion, and automatically covers them upon removal from the drive. 4.4 liner : Suitable material positioned between the case and the disk to provide cleaning action and protection from abrasion. 4.5 case : A protective enclosure including a
22、 shutter mechanism and a write-inhibit hole. 4.6 Master Standard Reference Flexible Disk Car- tridge : A reference flexible disk cartridge selected as the stan- dard for reference fields, signal amplitudes, resolution, peak shift and overwrite. Track 00 and track 79 on both sides are declared as ref
23、erence tracks. The reference tracks are calibrated at 600 r/min. The calibration is also valid at 300 r/min. NOTE - This master standard has been established by the Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, D-3300 Braunschweig, Germany, F.R. 4.7 Secondary Standard Reference Flexi
24、ble Disk Car- tridge : 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 - Secondary Standard Reference Flexible Disk Cartridges can be ordered from PTB Lab. 1.41 under Part Number RM 8860 as long
25、 as available. It is intended that these be used for calibrating further car- tridges for use in routine calibration. 1 1s0 6660-l : 1987 (I3 4.8 Typical Field : In the plot of average signal amplitude against recording field at the specified track and flux transition density, the Typical Field is t
26、he minimum field which causes a signal output equal to 95 % of the maximum Average Signal Amplitude. 4.9 Reference Field : The typical field of the Master Stan- dard Reference Flexible Disk Cartridge. There are two Reference Fields, one for each side. 4.10 Test Recording Current : The current betwee
27、n 148 % and 152 % of the current which produces the Reference Field at test frequency If on track 00. There are two Test Recording Currents, one for each side. 4.11 Standard Reference Amplitudes (SRAs) : The Average Signal Amplitudes derived from the reference tracks of the Master Standard Reference
28、 Flexible Disk Cartridge using the Test Recording Current. There are four SRAs, two for each side. SRAtf is the Average Signal Amplitude from a recording writ- ten using Test Frequency lfat Track 00. SRAJ is the Average Signal Amplitude from a recording writ- ten using Test Frequency 2f at Track 79.
29、 4.12 Average Signal Amplitude : For a track : the arithmetically averaged value of the output voltages measured peak-to-peak over the whole track. 4.13 in-contact : An operating condition in which the magnetic surface of the disk is in physical contact with the magnetic heads. 4.14 side : Side 0 is
30、 the side engaged bv the spindle. Side 1 is the opposite side. 4.15 direction of rotation : The direction of rotation shall be counter-clockwise when looking at Side 0. 4.16 index : The point on a track which determines the beginning and the end of the track. 4.17 formatting : Writing the proper con
31、trol information, establishing the physical cylinders and the addresses of physical records on the surfaces of the flexible disk. 4.18 initialization : Writing any information initially required to be on the flexible disk cartridge, for example the Volume Label, prior to the commencement of general
32、processing use. 5 General description 5.1 Figures In figures 1 to 5 : - Figure 1 shows Side 0 and enlarged cross-sections through the location holes; - Figure 2 shows Side 1; - Figure 3 shows at a larger scale the upper part of Side 0 without shutter; - Figure 4 shows the disk with hub; - Figure 5 s
33、hows the interface between the cartridge and the drive. 5.2 Main elements The main elements of the flexible disk cartridge are - the recording 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 heat window on both
34、 sides and a write-inhibit hole. The liner is provided between the case and the disk. It com- prises two layers of material between which the disk lies. The disk has a central hole with a metal hub attached. 6 General requirements 6.1 Environment and transportation 6.1.1 Testing environment Tests an
35、d measurements made on the cartridge to check the requirements of this International Standard shall be carried out under the following conditions : temperature : 23 + 2 OC (73 f 4 OF) relative humidity : 40 to 60 % conditioning before testing : 24 h minimum For the tests specified in 9.3 the tempera
36、ture and relative humidity shall be measured in the air immediately surrounding the cartridge drive. For all other tests the temperature and relative humidity shall be measured in the air immediately sur- rounding the cartridge. 2 IS0 8860-l : 1987 (El The stray magnetic field at any point on the di
37、sk surface, including that resulting from the concentrating effect of the recording head, shall not exceed 4 006 A/m (50 Oe). maximum rate of temperature change : 20 OC (36 OFI per hour relative humidity : 8 to 90 % There should be no deposit of moisture on or in the cartridge. 6.1.2 Operating envir
38、onment Cartridges used for data interchange shall be operated under the following conditions : 6.2 Materials 6.2.1 Case temperature : IO to 60 “C (50 to 140 OFI relative humidity : 8 to 80 % wet bulb temperature : less than 29 OC (85 OFI The temperature and relative humidity shall be measured in the
39、 air immediately surrounding the cartridge. It is recommended that the rate of change of the temperature should not exceed 20 OC (36 OFI per hour. NOTE - For reliable interchange, it is recommended that the temperature and relative humidity conditions when reading are not the opposite extreme to the
40、 conditions when writing. The case, which may be constructed from any suitable material, shall comply with the requirements of annex A. 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 shall be constructed from any suitable
41、material (for example bi-axially oriented polyethylene terephthalate) coated with a flexible layer of magnetic material. There shall be no deposit of moisture on or in the cartridge. 6.2.4 Hub The stray magnetic field at any point on the disk surface, in- cluding that resulting from the concentratin
42、g effect 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 : temperature : 4 to 53 OC (39 to 127 OFI relative humidity : 8 to 90 % There shall be no deposit of moisture on or in the cartridg
43、e. The ambient stray magnetic field shall not exceed 4 000 A/m W Oe). NOTE - 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
44、than 24 h within the operating environ- ment prior to use. 6.1.4 Transportation Responsibility for ensuring that adequate precautions are taken during 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
45、 sufficient space exists be- tween 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 should not be exceeded : temperature : -40 to 60 OC f -40 to 140 OFI The hub shall be made f
46、rom any suitable material (for example stainless steel alloy in compliance with IS0 683-13, type 8). 7 Dimensional characteristics The dimensions of the cartridge are referred to two reference axes X and Y, i.e. two lines in space intersecting at right angles. The plane they define is the Reference
47、Plane XY of the car- tridge. 7.1 Case 7.1.1 Shape (see figure I) The case shall be of rectangular form, its sides shall be I, = 94, 0 * 0,3 mm (3.700 + 0.012 in) The radius of three of its corners shall be f, = 2,0 + 1,0 mm (0.079 f 0.046 in) The angle of its fourth corner shall be 0 = 45O f 20 7.1.
48、2 Thickness (see figure 2) In the area extending 8,5 mm (0.335 in) from each of the two edges as shown in figure 2, the thickness of the case shall be e, = 3,3 f 0.2 mm (0.130 * 0.008 in) IS0 8860-l : 1987 (E) When the cartridge is inserted in the test gauge specified in annex D, a force not exceedi
49、ng 02 N (0.69 ozf), applied to the centre of the back edge shall cause the cartridge to pass through the gauge. The edge radius shall be r2 = 0,40 f 0,25 mm (0.150 f O.UlO in) 7.1.3 Hub access hole (see figure 1) On Side 0 there shall be a hub access hole the diameter of which shall be d, = 2650 mm min. (1.043 in min.) The position of the centre of this hole shall be defined by I, = 40.00 k 0,15 mm (1.575 f 0.006 in) I4 = 31,00 * 0,15 mm (1.220 * 0.006 in) 7.1.4 Locating holes (see figures 1 and 3
