ANSI INCITS ISO IEC 8378-1-1986 Information processing - 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 8378-1:19862010 (ISO 8378-1:1986, IDT) 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 Reaf

2、firmed as INCITS/ISO/IEC 8378-1:1986 R2015INCITS/ISO 8378-1:19862010 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 install

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5、ase 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: 10/6/10 Published by American National Standards Institute, 25 West 43rd Street, New York, New York

6、 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 Institute (ANSI), and Informa

7、tion 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 K Street NW, Suite 610,

8、Washington DC 20005. Printed in the United States of America ii ITIC 2010 All rights reserved IS0 8378/l-1986 (El Contents 0 1 2 3 4 5 5 7 8 9 10 Introduction Scope and field of application . Conformance. References . Definitions . General description. . General requirements Dimensionsal characteris

9、tics . . Physical characteristics Magnetic characteristics . Bibliography. Annexes . . . . . . . . . . . . . . . . . . . . . . . . A Measurement of the cartridge thickness. B Measurement of light transmittance C Method for measuring the effective track width . D Use of hub support rings. . . . . . .

10、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 1 1 1 2 2 3 5 5 7 . .11 13 15 16 iii INTERNATIONAL STANDARD IS0 8378/l-1986 (E) Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using mo

11、dified frequency modulation recording at 7 958 ftprad, 3,8 tpmm (96 tpi), on both sides - Part 1 : Dimensional, physical and magnetic characteristics 0 introduction IS0 8378 specifies the characteristics of 130 mm (5.25 in) flexible disk cartridges recorded at 7 958 ftprad, 3.8 tpmm (96 tpi), using

12、modified frequency modulation (MFM) record- ing on 80 tracks on each side. IS0 837812 and IS0 837813 each specify the quality of record- ed signals, the track layout, and a track format to be used on 130 mm (5.25 in) flexible disk cartridges, intended for data interchange between data processing sys

13、tems. IS0 8378/l and IS0 8378/2, together with the labelling scheme specified in IS0 7665, provide for full data interchange between data processing systems. IS0 837811 and IS0 8378/3, together with the labelling scheme specified in IS0 9293, provide for full data interchange between data processing

14、 systems. 1 Scope and field of application This part of IS0 8378 specifies the dimensional, physical and magnetic characteristics of the cartridge so as to provide physical interchangeability between data processing systems. NOTE - Numeric values in the SI and/or Imperial measurement system in this

15、part of IS0 8378 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 reconverted. The original design was made using Imperial units and further developments were made using SI units

16、. 2 Conformance A flexible disk cartridge shall be in conformance with IS0 8378 when it meets all the requirements of this part of IS0 8378 and all those of either IS0 8378/2 or IS0 8378/3. 3 References IS0 7885, Information processing - File structure and labelling of flexible disk cartridges for i

17、nformation interchange. IS0 8878, Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified fre- quency modulation recording at 7 958 ftprad, 3,8 tpmm (96 tpi), on both sides - Part 2 : Track format A. Part 3 : Track format B. IS0 9293, Information process

18、ing - Volume and file structure of flexible disk cartridges for information interchange. 4 Definitions For the purpose of this part of IS0 8378 the following defini- tions apply. 4.1 flexible disk : A flexible disk which accepts and retains on the specified side or sides magnetic signals intended fo

19、r input/output and storage purposes of information data pro- cessing and associated systems. 4.2 reference flexible disk cartridge : A flexible disk car- tridge arbitrarily selected for a given property for calibrating purposes. 4.3 secondary reference flexible disk cartridge : A flex- ible disk car

20、tridge intended for routine calibrating purposes, the performance of which is known and stated in relation to that of the reference flexible disk cartridge. 4.4 signal amplitude reference flexible disk cartridge : A reference flexible disk cartridge selected as a standard for recording field and sig

21、nal amplitude. NOTE - A master standard for signal amplitudes, reference fields, overwrite and resolution characteristics has been established by the Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 in Braunschweig, Germany, F. R. Secondary reference flexible disk car- tridges can be orde

22、red from PTB Lab 1.41 under part number RM 7487 as long as available. 4.5 typical field (for each side) : The minimum recording field, which, when applied to a flexible disk cartridge, causes a signal output equal to 95 % of the maximum average signal 1 IS0 8378/l-1986 (EI amplitude when taken as a

23、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 reference flexible disk cartridge. 4.7 test recording current (for each side) : The current be- tween 145 % and 155 %

24、of the current which produces the reference field at 125 000 flux transitions per second (ftps) on track 00 on both sides. 4.8 standard reference amplitude (SRA) (for each side) : The average signal amplitudes derived from the reference tracks on the signal amplitude reference flexible disk cartridg

25、e using the appropriate test recording current. SRA tfis the average signal amplitude from a recording written using125 000 ftps. SRAzfis the average signal amplitude from a recording written using 250 000 ftps. 4.9 average signal amplitude : The arithmetically averaged value for a track of the outp

26、ut 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 with the magnetic heads. 4.11 formatting : Writing the proper control information, establishing the physical tra

27、cks, 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 be on the flexible disk cartridge prior to the commencement of general process- ing or use. 4.13 recordin

28、g 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 in figures 1 to 3 as follows : Figure 1 - Flexible disk cartridge, shows the cartridge seen from above, side 0 up. Figure 2 -

29、Section A-A, is a cross-section along line A-A in figure 1. Figure 3 - Protective envelope with cartridge, shows a protective envelope with cartridge, side 1 up. 5.2 Main elements The main elements of this flexible disk cartridge are - the recording disk; - the liner; - the jacket. The cartridge is

30、stored in an envelope. 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 comprises two layers of material between which the disk is held. The liner has the same openings as

31、 the jacket. The disk has only a central and an index window. 5.4 Optional features The interchange characteristics of the jacket allow for varia- tions of its construction as follows : a) the jacket may include flaps (for example three flaps as shown in the diagram, or more); b) the jacket may incl

32、ude notches along the reference edge; c) the centre of the disk may be reinforced by hub support rings (see annex D). 6 General requirements 6.1 Environment and transportation 6.1 .I Testing environment Tests and measurements made on the cartridge to check the requirements of IS0 8378 shall be carri

33、ed out under the follow- ing conditions : - temperature : 23 f 2 OC (73 IL 4 OFI; - relative humidity : 40 to 60 %; - conditioning before testing : 24 h minimum. The temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. The stray magnetic field at

34、any point on the disk surface, in- cluding that resulting from the concentrating effect of the recording head, shall not exceed 4 000 A/m (50 Oe). 6.1.2 Operating environment Cartridges used for data interchange shall be operated under the following conditions : - temperature : 10 to 51,5 OC (50 to

35、125 OF); 2 IS0 8378/l-1986 (E) - relative humidity : 20 to 80 %; - wet-bulb temperature : less than 29 OC (84 OF). The temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. It is rec- ommended that the rate of change of the temperature should not e

36、xceed 20 OC (36 OFI per hour. For reliable interchange, it is recommended that the temperature and relative humidity conditions when reading are not at the opposite extremes to the conditions when writing. There shall be no deposit of moisture on or in the cartridge. The stray magnetic field at any

37、point on the disk surface, in- cluding that resulting from the concentrating 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 51,5 OC (40 to 125 OFI; - relativ

38、e humidity : 8 to 80 %. Each cartridge shall be in an envelope and in an upright pos- ition. There shall be no deposit of moisture on or in the cartridge. The ambient stray magnetic field at any point on the disk sur- face shall not exceed 4 000 A/m (50 Oe). NOTE - Cartridges which have been stored

39、at temperatures and humidities outside the operating conditions may exhibit degraded per- formance characteristics. Such cartridges should be subjected to a conditioning period of not less than 24 h within the operating environ- ment prior to use. 6.1.4 Transportation Responsibility for ensuring tha

40、t adequate precautions are taken during transportation shall be with the sender. During transpor- tation the cartridge shall be in its envelope and in a protective package. The latter shall be free from dust or extraneous mat- ter. It shall have a clean interior and a construction to minimize ingres

41、s of dust and moisture. It is recommended that a suffi- cient space exists between cartridge and outer surface of the final container so that risk of damage due to stray magnetic fields will be negligible. It is recommended that the following conditions are not exceeded : - temperature : -40 to 51,5

42、 OC (-40 to 125 OF); - maximum rate of temperature change : 20 OC (36 OF) per hour; - relative humidity : 8 to 90 %. There should be no deposit of moisture on or in the cartridge. 6.1.5 Handling The cartridge shall stay out of its envelope for the shortest time possible. When handling the cartridge

43、the operator shall not touch the exposed magnetic surfaces of the disk and shall avoid exposing the cartridge to direct sunlight, moisture and dust. 6.2 Materials 6.2.1 Jacket The jacket may be constructed from any suitable material. 6.2.2 Liner The material of the liner shall be able to retain dust

44、 without damage to the disk. 6.2.3 Disk The disk may be constructed from any suitable material (for ex- ample bi-axially oriented polyethylene terephthalate) coated on both sides with a strong and flexible layer of magnetic material (for example y-Fe,Os). 6.2.4 Envelope The envelope may be manufactu

45、red from any suitable material (for example paper). 6.3 Direction of rotation The direction of rotation shall be counterclockwise when look- ing at side 0. 7 Dimensional characteristics The dimensional characteristics listed in the following clauses are indicated in figures 4 to 7. Figure 4 - Jacket

46、 dimensions, shows the jacket. Figure 5 - Cartridge thickness, shows a partial cross- section of the jacket. Figure 6 - Disk dimensions, shows the disk. Figure 7 - Disk thickness, shows a cross-section of the disk. All dimensions are referred to the reference edge of the cartridge (see figure 4). 7.

47、1 Jacket 7.1.1 Form The jacket shall have a square form with angles of 90 + 30, and a side length I, = 133,3 + 0,4 mm (5.250 + 0.015 in) IS0 6376/l-1966 (El 7.1.2 Thickness 7.1.2.1 Jacket wall and liner In an area defined by r, = 35 mm (1.38 in) r2 = 50 mm (1.97 in) and with a probe having a diamete

48、r of 15 mm (0.59 in) applied against the cartridge with a force of 1 N (3.6 ozf), the thickness of the jacket wall and liner shall be e, = 0.45 Z!Z 0.15 mm (0.018 k 0.006 in) 7.1.2.2 Cartridge The overall thickness of the cartridge shall be (see 7.1.7) I,2 mm (0.047 in) e2 2,l mm (0.083 in), when me

49、asured according to clauses A.1 and A.2 of annex A. The cartridge shall fall freely through a gauge with a 2.6 mm (0.10 in) wide opening having flat, vertical walls and depth of 150 mm (5.90 in). 7.1.3 Central windows The central windows shall have a diameter d, = 3!3,7 f 0,2 mm (1.563 * 0.008 in) The position of their centre is defined by I2 = 66,65 III 0,30 mm (2.624 + 0.012 in). 7.1.4 Index windows 7.1.4.1 Location The centre of the index windows shall be defined by /3 = 42,lO IL 0,25 mm (1.