ANSI INCITS ISO 6596-1-1985 Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using two-frequency recording at 7 958 ftprad 1.9 tpmm (48 tpi) o.pdf

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1、 INCITS/ISO 6596-1:19852010 (ISO 6596-1:1985, IDT) Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using two-frequency recording at 7 958 ftprad, 1.9 tpmm (48 tpi), on one side - Part 1 : Dimensional, physical and magnetic characteristics Reaffirmed as INCITS/I

2、SO 6596-1:1985 R2015INCITS/ISO 6596-1:19852010 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 computer per

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5、 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 Copyright 201

6、0 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 Technology Indu

7、stry 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, Washington DC 20005.

8、 Printed in the United States of America ii ITIC 2010 All rights reserved Contents Page Introduction . Scope and field of application References Definitions General description. General requirements . Dimensional characteristics. . Physical characteristics . Magnetic characteristics Annexes A Measur

9、ement of the cartridge thickness. . 6 Measurement of light transmittance C Method for measuring the effective track width D Use of additional tracks. 11 13 15 16 iii INTERNATIONAL STANDARD IS0 6596/l-1985 (El Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges usin

10、g two-frequency recording at 7 958 ftprad, I,9 tpmm (48 tpi), on one side - Part 1 : Dimensional, physical and magnetic characteristics 0 Introduction IS0 6596 specifies the characteristics of 130 mm (5.25 in) flex- ible disk cartridges recorded at 7 956 ftprad on one side using two-frequency record

11、ing. IS0 6596/2 specifies the quality of recorded signals, the track layout, and the track format to be used on a 130 mm (5.25 in) flexible disk cartridge, recorded at 7 956 ftprad, I,9 tpmm (46 tpi), on one side, using two-frequency recording, which is intended for data interchange between data pro

12、cessing systems. Together with the labelling scheme to be specified in IS0 7665, IS0 6596/l and IS0 6596/2 provide for full data interchange between data processing systems. 1 Scope and field of application This part of IS0 6596 specifies the dimensional, physical and magnetic characteristics of the

13、 cartridge, so as to provide physical interchangeability between data processing systems. NOTE - Numeric values in the SI and/or Imperial measurement system in this International Standard may have been rounded and therefore are consistent with, but not exactly equal to, each other. Either system may

14、 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. 2 References IS0 545, information processing - IS.0 7-bit coded character set for information interchange. IS0 2022, Information pr

15、ocessing - IS0 7-bit and - the liner; There shall be no deposit of moisture on or in the cartridge. - the jacket. The stray magnetic field at any point on the disk surface, in- cluding that resulting from the concentrating effect on the recording head, shall not exceed 4 000 A/m (50 Oe). The cartrid

16、ge is stored in an envelope. 2 IS0 6596/l-1965 (El 5.1.3 Storage environment 5.2.3 Disk During storage the cartridges shall be kept under the following conditions : The disk may be constructed from any suitable material (for ex- ample, bi-axially oriented polyethylene terephthalate) coated at least

17、on one side with a strong and flexible layer of magnetic material (for example y-Fe203). temperature : 4 to 51.5 “C MO to 125 OF) relative humidity : 8 % to 80 % 5.2.4 Envelope Each cartridge shall be in an envelope and in an upright position. The envelope may be manufactured from any suitable mater

18、ial, (for example, paper). The stray magnetic field shall not exceed 4 000 A/m (50 Oe). 5.3 Direction of rotation NOTE - Cartridges which have been stored at temperatures and humidities outside the operating condition but within the storage con- ditions may exhibit degraded performance characteristi

19、cs. Such car- tridges should be subjected to a conditioning period of not less than 24 h within the operating environment prior to use. The direction of rotation shall be counterclockwise when look- ing at side 0. 6 Dimensional characteristics 5.1.4 Transportation The dimensional characteristics lis

20、ted in the sub-clauses below are indicated in figures 4 to 7 as follows : Responsibility for ensuring that 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 fr

21、ee from dust or extraneous matter. It shall have a clean interior and construction prevent- ing ingress of dust and water. It is recommended that a sufficient space exists between cartridge and outer surface of the final container, so that risk of damage due to stray magnetic fields will be negligib

22、le. Figure 4 - Jacket 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. It is recommended that the following conditions should not be ex

23、ceeded : All dimensions are referred to the reference edge of the car- tridge (see figure 4). temperature : -40 to 51.5 OC ( -40 to 125 “F) maximum,rate of temperature change : 20 OC (36 OFI per hour 6.1 Jacket relative humidity : 8 % to 90 % 6.1.1 Form No moisture shall condense in or on the cartri

24、dge. 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) 5.1.5 Handling The cartridge shall stay out of its envelope for the shortest time possible. When handling the cartridge the operator shall not touch the exposed magnetic surfaces

25、of the disk and shall avoid exposing the cartridge to direct sunlight, moisture and dust. 6.1.2 Thickness 6.1.2.1 Jacket wall and liner In an area defined by 5.2 Materials r, = 35 mm (1.38 in) 5.2.1 Jacket r2 = 50 mm (1.97 in) The jacket may be constructed from any suitable material. and with a prob

26、e having a diameter 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 5.2.2 Liner The material of the liner shall be able to retain dust without damage to the disk. e, = 0,45 + 0,15 mm (0.018 * 0.006 in) 3 IS0 6596/l-1

27、965 (El 6.1.2.2 Cartridge The overall thickness of the cartridge shall be (see 6.1.7) : 1,2 mm (0.047 in) where n is the numeric value corresponding to the track number: n = 0 to 34 for data interchange (see also annex D). 8.1.3.2 Track location tolerance The centrelines of tracks recorded for testi

28、ng purposes shall be within f 0,025 mm (0.001 0 in) of the nominal positions, when measured in the testing environment (see 5.1 .I). 8.1.4 Track number The track number shall be a two-digit decimal number (00 to 34) which identifies the tracks consecutively, starting at the outer- most track 0lO) (s

29、ee also annex D). 8.1.5 Index The index is the point which determines the beginning and the end of a track. At the instant of having detected the leading edge of the index window, the index is under the read-write gap. 8.2 Functional testing For the purpose of the following tests the same drive unit

30、 shall be used for writing and reading operations. 8.2.1 Surface tests The magnetic properties of the data surface are defined by the testing requirements given below. 8.2.1 .l Test conditions The disk shall be tested at 300 + 6 r/min. The test frequencies used shall be If = 125 000 f 125 ftps 2f =

31、250000 f. 250 ftps The frequency(ies) to be used is (are) specified for each test. The typical field of the disk under test shall be within f 20 % of the reference field. It shall be measured using If on track 00. 8.2.1.3 Average signal amplitude When a disk has been recorded with the test recording

32、 current, then read back on a system which has been calibrated by means of a signal amplitude reference flexible disk cartridge, recorded under the same conditions, the average signal amplitude of the disk under test shall be - not more than 130 % on track 00 using lf; - not less than 80 % on track

33、34 using 2f; of the appropriate standard reference amplitude. 8.2.1.4 Resolution After recording, using the test recording current, on track 34, the ratio average signal amplitude using 2f average signal amplitude using lf shall be greater than 80 % of the value of the same ratio for the signal ampl

34、itude reference flexible disk cartridge. 8.2.1.5 Overwrite On track 00 after recording with the test recording current, first using lf and then overwriting with 2f for one revolution, the ratio residual average signal amplitude at lf after overwrite using 2f average signal amplitude after first reco

35、rding using lf shall be less than 100 % of the value of the same ratio for the signal amplitude reference flexible disk cartridge. This test shall be performed with a frequency-selective voltmeter. 8.2.1.6 Modulation Modulation shall be maximum mean - minimum mean x 100% maximum mean + minimum mean

36、The maximum mean shall be the average value of the amplitude modulated output voltage in that part of the track with the maximum amplitudes, and the minimum mean shall be that in the respective part with the minimum amplitudes. Output voltage shall be measured peak-to-peak, averaging shall be done o

37、ver about 2 000 consecutive flux transitions. On track 00 using If and on track 34 using 2f, modulation shall be less than 10 %. IS0 6596/l-1995 (E) 8.2.2 Track quality tests These tests shall be carried out using 2f and over all 35 usable tracks at the defined positions. The test recording current

38、shall be used. 8.2.2.1 Missing pulse Write a track at 2f with the appropriate test recording current. Any playback signal, when measured base-to-peak, which is less than 40 % of half the arithmetically averaged value of the output voltages measured peak-to-peak over the preceding 2 000 consecutive f

39、lux transitions, shall be a missing pulse. 8.2.2.2 Extra pulse Write a track at 2f with the test recording current. Erase for one revolution with a constant direct current equivalent to the quiescent value of the test recording current. Any playback signal, which when measured base-to-peak, in- clud

40、ing the statistical noise and the residual signal of the disk, Central window - Index window - exceeds 30 % of half the average signal amplitude of the track under test, shall be an extra pulse. 8.2.3 Rejection criteria 8.2.3.1 Defective track A track on which one or more missing and or extra pulses

41、 are detected in the same position(s) on consecutive passes shall be a defective track. The applicable number of consecutive passes shall be a matter for agreement between interested parties. 8.2.3.2 Requirements for tracks As initially received from the medium supplier, the cartridges shall have no

42、 defective tracks. 8.2.3.3 Rejected cartridge A cartridge which does not meet the requirements of 8.2.3.2 shall be rejected. l Side 0 Jacket Disk - 0 7 A e- Head window v Figure 1 - Flexible disk cartridge Liner Flap Disk Liner Jacket Figure 2 - Section A-A 7 IS0 6596/l-1985 (E) Figure 3 - Protectiv

43、e envelope with cartridge IS0 6596/l-1995 (E) 1 - 11 J I . Figure 4 - Jacket dimensions Side 0 3 Reference edge IS0 6596/I-1985 (E) Figure 5 - Cartridge thickness Jacket Liner Disk Liner Jacket Figure 8 - Disk dimensions Figure 7 - Disk thickness _ . ._. ._ aD 1.1. :. 4- . ,._ :.;:. ._ F VL Ir t h 4

44、 m 46 * c Figure 8 - Pressure pad area IO IS0 6596/l-1985 (E) Annex A Measurement of the cartridge thickness (This annex forms part of the standard.) A.1 Maximum thickness A.2 Minimum thickness This value shall be measured for all edges using the gauge of This value shall be measured for all edges u

45、sing the gauge of figure 9. The cartridge shall be capable of entering the gauge figure 10. This gauge has a length of 40 mm (1.57 in). When for at least 15 mm (0.59 in) when a force of 1 N max. (3.6 ozf submitted to a force of 1 N (3.6 ozf) the cartridge shall enter max.) is applied on the opposite

46、 edge. the slot by less than 1 mm (0.039 in). Dimensions in millimetres (Inches in parentheses) lN(3.6ozfl 1 Figure 9 - Measuring gauge 11 IS0 6596/l-1985 (E) Dimensions in millimetres (Inches in parentheses) 11 N(3.6ozfl Figure 10 - Measuring gauge 12 IS0 6596/l-1965 (E) Annex B Measurement of ligh

47、t transmittance (This annex forms part of the standard.) B.0 Introduction The following description outlines the general principle of the measuring equipment and the measuring method to be applied when measuring the radiation (light) transmittance of the jacket and of the magnetic disk. For the purp

48、ose of this document “light transmittance” is defined by convention as the relationship between the reading obtained from the test device with the sample inserted and the reading obtained when no sample is present. The transmittance value is expressed as the percentage ratio of the two readings. The

49、 essential elements of the measuring equipment are the radiation source; the photo diode; the optical path; the measuring circuitry. Description of the measuring equipment Radiation source An infra red light-emitting diode (LED) with the following parameters shall be used : - wavelength at peak emission Apeak = 940 k 10 nm - half-power band width b = 31 50 nm NOTE - Earlier International Standards