SIST EN 28378-1:1998

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 7958 ftprad, 3,8 tpmm (96 tpi), on both sides - Part 1: Dimensional, physical and magnetic characteristics (ISO 8378-1:1986)Informationsverarbeitung - Datenaustausch auf 130 mm (5.25 in) Disketten mittels modifizierter Frequenzmodulationsaufzeichnung bei 7958 ftprad, 3,8 tpmm (96 tpi), auf beiden Seiten - Teil 1: Mechanische, physikalische und Größenanforderungen (ISO 8378-1:1986, Ausg. 1)Traitement de l'information - Echange de données sur cartouches a disquette de 130 mm (5,25 in) utilisant un enregistrement a modulation de fréquence modifiée a 7958 ftprad, 3,8 tpmm (96 tpi), sur deux faces - Partie 1: Caractéristiques dimensionnelles, physiques et magnétiques (ISO 8378-1:1986, éd. 1)Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified frequency modulation recording at 7958 ftprad, 3,8 tpmm (96 tpi), on both sides - Part 1: Dimensional, physical and magnetic characteristics (ISO 8378-1:1986, ed. 1)35.220.21Magnetni diskiMagnetic disksICS:Ta slovenski standard je istoveten z:EN 28378-1:1989SIST EN 28378-1:1998en01-januar-1998SIST EN 28378-1:1998SLOVENSKI
STANDARD



SIST EN 28378-1:1998



SIST EN 28378-1:1998



SIST EN 28378-1:1998



international 8378 / 1 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME~)(nYHAPO~HAR OPTAHbl3Al&lfl IlO CTAH,QAPTbI3A~l4t4~ORGANlSATlON INTERNATIONALE DE NORMALISATION 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 Traitemen t de Pin formation - &hange de don&es SW cartouches ;i disquette de 130 mm (5,25 in) utilisant un enregistrement 2 modulation de frkquence modifike ii 7 958 ftprad, 3,8 tpmm (96 tpi), sur les deux faces - Partie I : Caractkristiques dimensionnelles, physiques et magn6 tiques First edition - 1986-12-15 UDC 681 m327.63 Ref. No. IS0 8378/l-1986 (E) Descriptors : data processing, information interchange, data recording devices, magnetic disks, dimensions, physical properties, magnetic properties. Price based on 16 pages SIST EN 28378-1:1998



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 which 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 the 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 8378/l was prepared by Technical Committee ISO/TC 97, lnforma tion processing systems. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 International Organization for Standardization, 1986 0 Printed in Switzerland ii SIST EN 28378-1:1998



Is0 8378/l-1986 (El Contents Page 0 Introduction . 1 1 Scope and field of application . 1 2 @onformance . 1 3 References . 1 4 Definitions . 1 5 General description . 2 6 General requirements . 2 7 Dimensionsal characteristics . 3 8 Physical characteristics . 5 9 Magnetic characteristics . 5 10 Bibliography . 7 Annexes A Measurement of the cartridge thickness. . B Measurement of light transmittance . C Method for measuring the effective track width . D Use of hub suooort rinos. . . . 11 13 15 16 . . . Ill SIST EN 28378-1:1998



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INTERNATIONAL STANDARD IS0 8378/l-1986 (E) Information processing - Data interchange on 130 mm in) flexible disk cart idges using modified frequency ulation recordin at 7 958 ftprad, 3,8 tpmm (96 tpi), th 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 modified frequency modulation (MFM) record- ing on 80 tracks on each side. IS0 8378/2 and IS0 8378/3 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 systems. 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 8378/l and IS0 8378/3, 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 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 part of IS0 8878 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 re-converted. The original design was made using lmperial units and further developments were made using SI units. 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 83781’3. 3 References I SO 7665, lnforma tion processing - h/e structure and labelling of flexible disk cartridges for information interchange. I SO 8378, Information processing - Data interchange on 130 mm (5.25 in) flexible disk cartridges using modified fre- quency moduJa tion 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 processing - Volume and fife 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 for 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 cartridge 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 signal 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 ordered 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 SIST EN 28378-1:1998



IS0 8378/l-1986 (El amplitude when taken as a function of the recording field at the specified track and flux transition frequency of that flexible disk cartridge. 5.2 Main elements The main elements of this flexible disk cartridge are - the recording disk; 4.6 reference field : The typical field of the signal amplitude reference flexible disk cartridge. - the liner; - the jacket. 4.7 test recording current (for each side) : The current be- tween 145 % and 155 % of the current which produces the reference field at 125 000 flux transitions per second (ftps) on track 00 on both sides. The cartridge is stored in an envelope. 5.3 Description The jacket is of a square form. It includes a central index window and a head window in both sides. window, 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 cartridge using the appropriate test recording current. 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 the jacket. SRA If is the average signal amplitude from a recording written using ’ 125 000 ftps. The disk has only a central and an index window. SRAzfis the average signal amplitude from a recording written using’250 000 ftps. 5.4 Optional features The i nterchange characteristics of tions of its construction as follows the jacket allow for varia- 4.9 average signal amplitude : The arithmetically averaged value for a track of the output voltages measured peak-to-peak over the whole track. a) the jacket may include flaps shown in the diagram, or more) (for example three flaps as 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. b) the jacket may include notches along the reference edge; cl the centre of the disk may be reinforced by hub support rings (see annex m. 4.11 formatting : Writing the proper control information, establishing the physical tracks, and designating the addresses of physical records on the flexible disk’s surfaces. 6 6.1 6.1 . General requirements Environment and transportation 1 Testing environment 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. Tests and measurements made on the cartridge to check the 4.13 recording area : That area of each which the head may co me into con tact. disk surface with reel uirements of ing conditions : IS0 8378 be carried out under the follow- - temperature : 23 + 2 OC (73 It 4 OF); - relative humidity : 40 to 60 %; 5 General description - conditioning before testing : 24 h minimum. 5.1 General figures The temperature and the relative humidity shall the air immediately surro unding the cartridge. be measured A typical flexible as follows : disk cartridge is represented in figures 1 to 3 The stray magnetic field at 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). Figure 1 - Flexible disk cartridge, shows the cartridge seen from above, side 0 up. 6.1.2 Operating environment Figure 2 - Section A-A, is a cross-section along line A-A in figure 1. Cartridges used for data the following co nditions inte rchange shall be operated Figure 3 - Protective envelope with cartridge, shows protective envelope with cartridge, side 1 up. a - temperature : IO to 51,5 OC (50 to 125 OF); 2 SIST EN 28378-1:1998



IS0 8378/l-1986 (El - 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 exceed 20 OC (36 OF) 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 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 OF); - relative 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 at ternperatures 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 A Transportation 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 free from dust or extraneous mat- ter. It shall have a clean interior and a construction to minimize ingress 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 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 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 materi al of the liner shall be able to damage to the disk. retain dust without 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-Fe203). 6.2.4 Envelope The envelope may (for example paper be manufac tured from any suitable material 6.3 Direction of rotation The di rection ing at side 0. 7 The dimensiona I characteristics are i ndicated in figures 4 to 7. of rotation be counterclockwise when look- Dimensionall characteristics in the following clauses Figure 4 - Figure 5 - Jacket dimensions, shows the jacket. 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 cartridge (see figure 4). to the reference edge of the 7.1 Jacket 7.1.1 Form The jacket shall have a square form with angles of 90” & 38”, and a side length /I = 133,3 IL 0,4 mm (5.250 -t 0.015 in) SIST EN 28378-1:1998



IS0 8378/l-1986 (El 7.1.2 Thickness 7.1.2.1 Jacket wall and liner In an area defined by rl = 35 mm (1.38 in) r2 = 50 mm (1.97 in) 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 el = 0,45 + 0,15 mm (0.018 + 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 measured 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, = 39,7 + 0,2 mm (1.563 + 0.008 in) The position of their centre is defined by /2 = 66,65 + 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 l3 = 42,lO + 0,25 mm (1.657 + 0.010 in) la = 60,OO + 0,25 mm (2.362 + 0.010 in) 7.1.4.2 Diameter The diameter of the index windows shall be cl2 = 6,35 + 0,20 mm (0.250 + 0.008 in) 7.15 Head windows 7.1.5.1 Location The location of the lowest point of the head windows shall be defined by 15 = 3,30 Ifr 0,25 mm (0.130 & 0.010 in) 7.1.5.2 Dimensions The width of the head windows shall be l6 = 12,7 + 0,2 mm (0.500 + 0.008 in) The nominal radius of their ends shall be r3 = 6,35 mm (0.250 in) Their length shall be 17 = 35,00 + 0,25 mm (1.378 + 0.010 in) 7.1.6 Reference edge profile Within an area defined by lg = 25 mm (1.0 in) the reference edge shall have a convex profile, for example be rounded off with one or more radii of 0,3 mm min. (0.012 in min.). 7.1.7 Construction of the jacket If the jacket utilises flaps, their width shall not exceed I9 = 12 mm (0.47
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