1、INTERNATIONAL STANDARD ISO/IEC 13422 First edition 1994-l O-l 5 Information technology - Data interchange on 90 mm Flexible Disk Cartridges 10 MByte capacity using sector servo tracking - IS0 Type 304 Technologies de /information - khange de donnkes sur cartouches pour disque soup/e de 90 mm de diam
2、gtre, de 10 Mbyte de caparck 000. SRA-f, is the Avcragc Signal Ampliludc from a recording written using f, at Ir;lLC 754. 4.20 Typical Field: The minimum recording field which, when applied to :I Flcxiblc Disk Cartridge, causes a11 Average Signai Amplitude equal 10 95 G/o of the maximum Average Sign
3、al Amplitude when taken as a function of the recording field at the spccificd track and llux transition density. 4.21 write-inhibit hole: A through-hole with a sliding cover, provided on IIK C;IC IO inhibit writing on lhc disk when the hole is uncovcrcd. ISO/IEC 13422:1994(E) ISO/IEC Conventions and
4、 Notations Representation of numbers A measured value is rounded off to the least significant digit of the corresponding specified value. It implies that a specified value of 40.00 with a positive tolerance of tO,15, and a negative tolerance -0.15 allows a range of measured values from 39,845 to 40,
5、155. Letters A to F and digits in parentheses represent numbers in hexadecimal notation. Ihe setting of a bit is denoted by ZERO or ONE. Numbers in binary notation and bit combinations are represented by strings of ZEROS and ONES. Numbers in binary notation and bit combinations are shown with the mo
6、st significant bit to the left. Negative value of numbers in binary notation are given in TWOs complement. In each field the data is recorded so that the most significant byte (byte 0) is recorded first. Within each byte the least significant bit is numbered 1 and is recorded last, the most signific
7、ant bit (numbered 8 in an B-bit byte) is recorded first. This order of recording applies also to the data input of the Error Detection circuits and 10 their output. Acronyms ASA Average Signal Amplitude EDC Error Detecting Code Flexible Disk Cartridge Fast Fourier Transform ftprad flux transition pe
8、r radian ftps flux transition per second MFM Modified Frequency Modulation SRA Standard Reference Amplitude SVDT Servo Data SVID Servo Identifier ISO/IEC ISO/IEC 13422:1994(E) 6 General description 6.1 Drawings In the enclosed drawings: - Figure 13 shows Side 0 and enlarged cross-sections through th
9、e location and secondary identification holes; Figure 14 shows Side 1; Figure 15 shows at a larger scale the top part of Side 0 without shutter; Figure 16 shows the disk with hub; Figure 17 shows the interface between the cartridge and the drive. 6.2 Main elements The main elements of the Flexible D
10、isk Cartridge are the disk, the liner, the case. 6.3 Description The case includes a central hole on one side, head windows covered with a shutter on both sides, identification holes and a write-inhibit hole. The liner is provided between the case and the disk. It comprises two layers of material be
11、tween which the disk lies. The disk has a central hole with a metal hub attached. 6.4 Marking of the Flexible Disk Cartridge The case of the flexible disk shall be clearly marked with the following information: Type of flexible disk, type (both sides), mode of recording and number of tracks, IS0 Typ
12、e number Year and month of manufacture or mark thereof Manufacturers name or mark ISOhEC 13422:1!W4(3) ISO/IEC 7 General requirements 7.1 Environment and transportation 7.1.1 Testing environment Tests and measurements made on the cartridge to check the requirements of this International Standard sha
13、ll be operated under the following conditions, temperature: 23C + 2% relative humidity: 4o%to60% conditioning before testing: 24 h min. For the tests specified in 10.3 the temperature and relative humidity shall be measured in the air immediately surrounding the cartridge drive. For all other tests
14、the temperature and the relative humidity shall be measured in the air immediately surrounding the cartridge. The stray magnetic field at any point on the disk surface, including that resulting from the concentrating effect of the magnetic head, shall not exceed 4 000 A/m. 7.1.2 Operating environmen
15、t Cartridges used for data interchange shall be capable of operating under the following conditions temperature: 10% to 51 ,s% relative humidity: 20 % to 80 9% wet bulb temperature: less than 29% The temperature and the relative humidity shah be measured in the air immediately surrounding the cartri
16、dge. It is recommended that the rate of change of the temperature should not exceed 2OC per hour. There shall be no deposit of moisture on or in the cartridge. The stray magnetic field at any point on the disk surface, including that resulting from the concentrating effect of the magnetic head, shal
17、l not exceed 4 000 A/m. 7.1.3 Storage environment During storage the cartridges shall be kept within the following conditions temperature: 4-c to 53% relative humidity: 8%to90% The ambient stray magnetic field shall not exceed 4 000 A/m. There shall bc no deposit of moisture on or in the cartridge.
18、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 of not less than 24 h within the operating environment prior to use. 7.1.4 Trans
19、portation Responsibility for ensuring that adequate precautions are taken during the transportation shall bc with the sender. The cartridge shall be in a protective package free from dust or extraneous matter. It is recommended that a sufficient space exists between cartridge and outer surface of th
20、e final container, so that risk of erasure due to stray magnetic fields will be negligible. ISO/IEC ISO/IEC 13422:1994(E) It is recommended that the following conditions are not exceeded temperature: -4OC to 6oC maximum rate of temperature change: 20% per hour relative humidity: 8%to90% There should
21、 be no deposit of moisture on or in the cartridge. 7.2 Materials 7.2.1 Case The case may be constructed from any suitable material such that it meets the requirements of 8.7. 7.2.2 Liner The material of the liner shall be able to retain dust or debris without damage to the disk. 7.2.3 Disk The disk
22、may be constructed from any suitable material (e.g. bi-axially oriented polyethylene terephthalate) coated on both sides with a flexible layer of magnetic material (e.g. metal iron particles). 7.2.4 Hub The hub shall be made of any suitable material (e.g. stainless steel alloy in accordance with IS0
23、 683-13, type 8). 8 Dimensional characteristics The dimensions of the caruidge are referred to two Reference Axes X and Y. They arc two lines in space intersecting at right angles. The plane they define is the Reference Plane XY of the cartridge. 8.1 Case 8.1.1 Shape (figure 13) The case has a recta
24、ngular form, its sides shall be 45, = 94,0 mm rt 0,3 mm L,= 90,O mm +Oq4 mm - 0,l The radius of three of its comers shall bc R,=2,0mm+ 1,Omm The angle of its fourth comer shall be w = 45 rt 2 8.1.2 Thickness (figure 14) In the area extending 8.5 mm from each of the two edges as shown in figure 13. I
25、hc thickness of the cast shall bc E, = 3.3 mm 2 0.2 mm When the cartridge is inscrtcd in the test gauge specified in annex G, a force 010.2 N maximum, applied to the cenue of the. back edge shall cause the cartridge to pass through the gauge. The edge radius shall be R, = 0,40 mm + 0.25 mm ISO/IEC 1
26、3422:1994(E) ISO/IEC 8.1.3 Hub access hole (figure 13) On Side 0 there shall be a hub access hole the diameter of which shall be D, = 26.50 mm min. The position of the centre of this hole shall be defined by L,=4O,OOmm+0,15mm L,=31,OOmmf0,15mm 8.1.4 Locating holes (figures 13 and 15) 8.1.4.1 Primary
27、 locating hole The centre of the primary locating hole shall be at the intersection of Reference Axes X and Y. Its diameter shall be D,= 3,6mm I!I 0,l mm The dimensions of its section (see cross-section A-A in figure 13) shall be Da =1,5mmmin. 4 = 0.2 mm rt 0,l mm 4 = 1,Ommmin. Lto = 2.5 mm min. 8.1
28、.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 L, = 80.0 mm k 0.2 mm It shall have a substantially rectangular shape. Its short axis shall be (see cross-section B-B in figure 13) La = 3.6 mm k 0,l mm It
29、s long axis shall be 4 = 4.4 mm z!z 0,2 mm The dimensions D, L, L, and L, of the cross-section of the secondary locating hole are as specified in 8.1.4.1. 8.1.5 Label area 8.1.5.1 Side 0 (figure 13) The locations and dimensions of the label area of Side 0 shall be defined by Ltt = 3,5 mm min. L*, =
30、76,5 mm max. L, = 60,O mm min. 8.1.5.2 Side 1 (figure 14) The locations and dimensions of the label area of Side I shall bc defined by L, = 3,5 mm min. LLI= 76,5 mm max. Lt, = 20,O mm min. 8.1.6 Head windows (figure 15) The locations and dimensions of the two head windows are specified by the same s
31、et of dimensions. ISO/IEC ISOlIEC 13422:1994(E) 8.1.6.1 Location The location of the head windows shall be defined by 4s = 12.3 mm min. Lta= 11,5mmmin. 4, = 35,5 mm + 0,2 mm 8.1.6.2 Dimensions The width of the head windows shall be Lt* = 9,OO mm + 0,20 mm The radius of their comers shall be R, = 0,5
32、 mm L 39 = 2,0 mm + 0,2 mm La= 10,OO mm zk 0.15 mm The radius of one comer of this hole shall be R, = 2.0 mm L,l = 7,50 mm f 0,15 mm Their dimensions shall be L ,* = 3,0 mm min. L ,3 = 4,2 mm k 0,2 mm Their depth below the Reference Plane XY shall be 44 = 2,0 mm min. 8.6 Interface between cartridge
33、and drive (figure 17) When the cartridge is inserted into the drive, the drive spindle engages the cartridge as shown in figure 17. The hub is held against the drive spindle by means of a magnetic attraction force. When in this position the distance between the hub surface on Side 0 and plane XY sha
34、ll be L46 = 0,3 mm nominal The inside dimensions of the case with the centre plate on Side 1 shall be D, = 7,0 mm min. E,= 1,3mm fO,l mm with the exception of the annular zone defined by L, and La where the thickness shall be E, = 2,5 mm max. L, shall be sufficiently large to ensure that the circumf
35、erence of the disk shall not touch the inside edges of the case. The value of L, specified below is a recommended value, therefore it is stated without tolerance. L 47 = 22,6 mm L,=21,7mm+0,2mm 8.7 Compliance When the cartridge is constrained in the manner described in annex A, the cartridge shall b
36、e in contact with posts P, to P,. 9 Physical characteristics 9.1 Flammability The disk, case and liner components shall be made from materials that, if ignited from a match flame, do not continue lo bum in a still carbon dioxide atmosphere. I2 ISO/IEC ISO/IEC 13422:1994(E) 9.2 Coefficient of linear
37、thermal expansion of the disk The coefficient of thermal expansion of the disk shall be (17 + 8) X 106per C. The range from maximum value to minimum value on the disk surface shall be 8 X 106 per C max. 9.3 Coeffhzient of linear hygroscopic expansion of the disk The coefficient of hygroscopic expans
38、ion of the disk shall be (0 to 15) X 106 per % of relative humidity. The range from maximum value to minimum value on the disk surface shall bc 5 X 106 per % of relative humidity max. 9.4 Torque 9.4.1 Starting torque The starting torque, without tie heads loaded, shall not exceed 0,006 N am. 9.4.2 R
39、unning torque The torque necessary to turn the disk, without the heads loaded, shall be in the riingc 0,000 5 N *m to 0,002 5 N *m when the cartridge is in operation at a speed of 360,O rpm * 3,6 rpm. 10 Magnetic characteristics 10.1 Recording area On each side the magnetic properties specified shal
40、l be uniform in the recording arca, which shall be the area limited by two radii: 20.6 mm max. 42.0 mm min. 10.2 Track geometry 10.2.1 Number of tracks In Lhc recording arca thcrc shall bc 255 discrctc concentric tracks on each side 01 disk 10.2.2 Width of tracks The width of a recorded track shall
41、bc 0,044 mm f O,(x)3 mm The method of measuring cffcclivc track width is given in annex C 10.2.3 Track location 10.2.3.1 Nominal locations The nominal radius (R”) of the ccnlrcllnes 01 11 rraclh shall hc calculasd t) IIII;! IIIC torllulit: K” 110111. = x - 0.0s rl ISOlIEC 13422:1994(E) ISO/-lEC wher
42、e n is the track number, n = 000 to 254 x = 39,500 mm for Side 0. x = 38,000 mm for Side 1 10.2.3.2 Track location tolerance For testing purposes the centrelines of the recorded tracks shall be within , modulation shall tx less than IO %. This IUSI shall bc pcrformcd on both sides. IS ISO/IEC 13422:
43、1994(E) ISO/IEC 10.3.2 Track quality tests These tests shall apply to all 255 tracks at the defined positions on each side. The appropriate Test Recording Current shall be used. 10.3.2.1 Missing pulse Write a track with& and measure the Average Signal Amplitude. Any playback signal which, when measu
44、red base- to-peak, is less than 65 % of half the Average Signal Amplitude of the track, shall be a missing pulse. 10.3.2.2 Extra pulse Write a track with fi and measure the Average Signal Amplitude. Then erase the track for one revolution with a direct current equal to the quiescent value (Iq) of th
45、e Test Recording Current applied to the head (see figure 1). Any playback signal which, when measured base-to-peak, exceeds 20 % of half the Average Signal Amplitude shall be an extra pulse. Figure 1 - Quiescent value of Test Recording Current 10.3.3 Rejection criteria 10.3.3.1 Requirement for track
46、s A defective position is a position where missing and/or extra pulses are detected on three consecutive passes. 10.3.3.1.1 Tracks 000 to 003 As initially received from the medium supplier, the cartridge shall have no defects for track 000 to track 003. 10.3.3.1.2 Tracks 004 to 254 As initially rece
47、ived from the medium supplier, the cartridge shall have no more than one defect on each track, and it is recommended that the total number of the defects on both sides should be no more than 10, for track 004 to track 254. 10.3.3.1.3 Guard areas out of track -001 and track 255 These areas shall comp
48、rise a 7-track wide band on the outer side of track -001 and a 3-track wide band on the inner side of track 255, and it is recommended that the total number of the defects on both sides should be no more than 100 in these areas. 16 ISO/IEC 10.3.3.2 Rejected cartridge A cartridge which does not meet
49、the requirements of 10.3.3.1 shall be rejected. ISO/IEC 13422:1994(E) 11 General requirements of the data track recording 11.1 Method of recording The method of recording shall be Modified Frequency Modulation (MFM). 11.2 Track location tolerance of the recorded Flexible Disk Cartridge Within the testing environment specified in 7.1 .l the centrelines of the recorded data tracks shall be within & 0,028 mm of the nominal track locations. 11.3 Recording offset angle (figure 2) At the instant of writing or reading a magnetic transition, the trans
