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1、International Standard ) 6596/ 1 0 a 4 4! ,NTERNAT,ONAL ORGANlZATlON FOR STANDARDIZATION.ME)AYAPOAAfl OPrAHH3AUHR OCTAHAAPTM3AUklklRGANlSATlON INTERNATIONALE DE NORMALISATION Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using two-frequency recording at 7 958
2、 ftprad, I,9 tpmm (48 tpi), on one side - Part 1 : Dimensional, physical and magnetic characteristics Traitement de / information - khange de l information sur cartouches B disquette de 130 mm (5,25 in) utilisant un enregistrement I) deux frhquences r) 7 959 ftprad, 1,9 tpmm (48 tpi), sur une face -
3、 Partie 1 : Caracttkistiques dimensionnelles, physiques et magnbtiques Second edition - 1985-04-01 iii g UDC 681327.63 Ref. No. IS0 6596/1-1985(E) Descriptors : data processing, information interchange, data recording devices, magnetic disks, flexible disks, specifications, dimensions, physical prop
4、erties, magnetic properties. s Price based on 16 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IH
5、S -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for w
6、hich a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to th
7、e member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6596/l was prepared by Technical Committee ISO/TC 97, Infor
8、mation processing systems. IS0 6596/l was first published in 1982. This second edition cancels and replaces the first edition, the following clauses of the previous edition have been technically revised: 6.1.9, 8.2.1.3, annex D, figure 4, figure 8 and figure 14. 0 International Organization for Stan
9、dardization, 1985 0 Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IHS -,-,- C
10、ontents Page Introduction . Scope and field of application References Definitions General description. General requirements . Dimensional characteristics. . Physical characteristics . Magnetic characteristics Annexes A Measurement of the cartridge thickness. . 6 Measurement of light transmittance C
11、Method for measuring the effective track width D Use of additional tracks. 11 13 15 16 iii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networki
12、ng permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 6596/l-1985 (El Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using two-frequency recording at 7 958 ftprad, I,9 tpmm (48 tpi), on one side - Part 1 : Dimensional, physical and magnetic ch
13、aracteristics 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 recording. IS0 6596/2 specifies the quality of recorded signals, the track layout, and the track format to be used on a 130 mm (
14、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 processing systems. Together with the labelling scheme to be specified in IS0 7665, IS0 6596/l and IS0 6596/2 provide for ful
15、l 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 cartridge, so as to provide physical interchangeability between data processing systems. NOTE - Numeric values in the SI
16、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 be used, but the two should be neither intermixed nor reconverted. The original design was made using Imperial units and
17、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 processing - IS0 7-bit and - the liner; There shall be no deposit of moisture on or in the cartridge. - the jacket. The stra
18、y 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 cartridge is stored in an envelope. 2 Copyright International Organization for Standardization Provided by IHS under license with
19、 ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IHS -,-,- 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
20、disk may be constructed from any suitable material (for ex- ample, bi-axially oriented polyethylene terephthalate) coated at least 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 E
21、nvelope Each cartridge shall be in an envelope and in an upright position. The envelope may be manufactured from any suitable material, (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 temperature
22、s and humidities outside the operating condition but within the storage con- ditions may exhibit degraded performance characteristics. 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 b
23、e counterclockwise when look- ing at side 0. 6 Dimensional characteristics 5.1.4 Transportation The dimensional characteristics listed 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
24、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 matter. It shall have a clean interior and construction prevent- ing ingress of dust and water. It is recommended that a sufficient space exis
25、ts between cartridge and outer surface of the final container, so that risk of damage due to stray magnetic fields will be negligible. 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 d
26、isk. Figure 7 - Disk thickness, shows a cross-section of the disk. It is recommended that the following conditions should not be exceeded : 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 c
27、hange : 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 cartridge. 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 i
28、ts envelope for the shortest time possible. When handling the cartridge the operator shall not touch the exposed magnetic surfaces of the disk and shall avoid exposing the cartridge to direct sunlight, moisture and dust. 6.1.2 Thickness 6.1.2.1 Jacket wall and liner In an area defined by 5.2 Materia
29、ls 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 probe 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 m
30、aterial 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 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MD
31、TNo reproduction or networking permitted without license from IHS -,-,- IS0 6596/l-1965 (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 ann
32、ex D). 8.1.3.2 Track location tolerance The centrelines of tracks recorded for testing 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)
33、which identifies the tracks consecutively, starting at the outer- most track 0lO) (see 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 ga
34、p. 8.2 Functional testing For the purpose of the following tests the same drive unit 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 teste
35、d at 300 + 6 r/min. The test frequencies used shall be If = 125 000 f 125 ftps 2f = 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.
36、2.1.3 Average signal amplitude When a disk has been recorded with the test recording 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
37、 shall be - not more than 130 % on track 00 using lf; - not less than 80 % on track 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 us
38、ing lf shall be greater than 80 % of the value of the same ratio for the signal amplitude 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 signa
39、l amplitude at lf after overwrite using 2f average signal amplitude after first recording 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
40、 Modulation shall be maximum mean - minimum mean x 100% maximum mean + minimum mean 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
41、amplitudes. Output voltage shall be measured peak-to-peak, averaging shall be done over about 2 000 consecutive flux transitions. On track 00 using If and on track 34 using 2f, modulation shall be less than 10 %. Copyright International Organization for Standardization Provided by IHS under license
42、with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IHS -,-,- 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 p
43、ositions. The test recording current 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 o
44、ver the preceding 2 000 consecutive flux 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
45、 when measured base-to-peak, in- cluding 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 on
46、e or more missing and or extra pulses 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 s
47、upplier, the cartridges shall have no 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 Cop
48、yright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6596/l-1985 (E) Figure 3 - Protective envelope with cartridge Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 02:46:44 MDTNo reproduction or networking permitted without license from IHS -,