EN ISO/IEC 7487-1:1995

SLOVENSKI STANDARD
SIST EN ISO/IEC 7487-1:1997
01-december-1997
Information technology - Data interchange on 130 mm (5,25 in) flexible disk
cartridges using modified frequency modulation recording at 7958 ftprad, 1,9
tpmm (48 tpi), on both sides - ISO type 202 - Part 1: Dimensional, physical and
magnetic characteristics (ISO/IEC 7487-1:1993)
Information technology - Data interchange on 130 mm (5,25 in) flexible disk cartridges
using modified frequency modulation recording at 7958 ftprad, 1,9 tpmm (48 tpi), on both
sides - ISO type 202 - Part 1: Dimensional, physical and magnetic characteristics
(ISO/IEC 7487-1:1993)
Informationstechnik - Datenaustausch auf 130 mm (5,25 in) Disketten mit modifizierter
Wechseltaktschrift bei zweiseitiger Aufzeichnung mit 7958 Flußwechselrad und 1,9
Spuren/mm (48 tpi) - ISO Typ 202 - Teil 1: Maße, physikalische und magnetische
Eigenschaften (ISO/IEC 7487-1:1993)
Technologies de l'information - Echange de données sur cartouches a disquettes de 130
mm (5,25 in) utilisant un enregistrement a modulation de fréquence modifiée (MFM) a
7958 ftprad, 1,9 tpmm (48tpi) sur les deux faces - Type ISO 202 - Partie 1:
Caractéristiques dimensionnelles, physiques et magnétiques (ISO/IEC 7487-1:1993)
Ta slovenski standard je istoveten z: EN ISO/IEC 7487-1:1995
ICS:
35.220.21 Magnetni diski Magnetic disks
SIST EN ISO/IEC 7487-1:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO/IEC 7487-1:1997

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SIST EN ISO/IEC 7487-1:1997

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SIST EN ISO/IEC 7487-1:1997

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SIST EN ISO/IEC 7487-1:1997
INTERNATIONAL ISO/IEC
STANDARD 7487-1
Second edition
1993-12-15
Information technology - Data
interchange on 130 mm (5,25 in) flexible
disk cartridges using modified frequency
modulation recording at 7 958 ftprad,
1,9 tpmm (48 tpi), on% both sides - ISO
type 202 -
Part 1:
Dimensional, physical and magnetic
characteristics
Technologies de I’information - khange de donnees SW cartouches 4
disquettes de 130 mm (5,25 in) utilisant un enregistrement A modulation
de frbquence modifike (MFM) 2 7 958 ftprad, 1,9 tpmm (48 tpi) sur /es
deux faces - Type ISO 202 -
Partie 1: Caractkistiques dimensionnelles, physiques et magnetiques

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SIST EN ISO/IEC 7487-1:1997
ISO/IEC 7487=1:1993(E)
Contents
Page
1
1 Scope . . . . . . . . . . . . . . . . . . . . . . . .*.~.
1
2 Conformance .
1
................................................................
3 Normative references
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
4 Definitions
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 General description
5
.,.,.
6 General requirements
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Dimensional characteristics
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Physical characteristics
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 Magnetit characteristics
Annexes
.............................. 13
A Measurement of the cartridge thickness
..................................... 15
B Measurement of light transmittance
.................. 18
C Method for measuring the effective track width
19
.......................................................
D Use of hub support rings
20
............................................................................
E Bibliography
0 ISO/lEC 1993
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
ISO/1 EC Copyright Office l Case Postale 56 l Cl-l-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO/IEC 7487-1:1997
0 lSO/IEC
ISO/lEC 7487=1:1993(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized System for
worldwide standardization. National bodies that are members of ISO or
IEC participate in the development of International Standards through
technical committees established by the respective organization to deal
with particular fields of technical activity. ISO and IEC technical com-
mittees collaborate in fields of mutual interest. Other international organ-
izations, governmental and non-governmental, in liaison with ISO and IEC,
also take part in the work.
In the field of information technology, ISO and IEC have established a joint
technical committee, lSO/IEC JTC 1. Draft International Standards adopted
by the joint technical committee are circulated to national bodies for vot-
ing. Publication as an International Standard requires approval by at least
75 % of the national bodies casting a vote.
International Standard lSO/IEC 7487-1 was prepared by Joint Technical
Committee lSO/IEC JTC 1, Information technology, Subcommittee SC 11,
Flexible magnetic media for digital da ta interchange.
This second edition cancels and replaces the first edition
(ISO 7487.1:1985), of which it constitutes a technical revision.
lSO/IEC 7487 consists of the following Parts, under the general title In-
forma tion technology - Data in terchange on 130 mm (5,25 in) flexible disk
cartridges using modified frequency modulation recording at 7 958 ftprad,
1,9 tpmm (48 tpi), on bo th sides - ISO type 202:
- Part 1: Dimensional, physical and magnetic characteristics
- Part 2: Track format A
- Part 3: Track format B
Annexes A, B and C form an integral part of this part of lSO/IEC 7487.
Annexes D and E are for information only.
. . .
Ill

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SIST EN ISO/IEC 7487-1:1997
0 lSO/IEC
ISO/IEC 748791:1993(E)
Introduction
lSO/lEC 7487 specifies the characteristics of 130 mm (5,25 in) flexible
disk cartridges recorded at 7 958 ftprad, 1,9 tpmm (48 tpi), on both sides
using modified frequency modulation recording.
ISO 7487-2 and ISO 7487-3 each specify the quality of recorded Signals,
the track layout, and a track format to be used on such a flexible disk
cartridge, which is intended for data interchange between data processing
Systems.
Together with the labelling scheme specified in ISO 7665, ISO/IEC 7487-1
and ISO 7487-2 provide for a full data interchange between data process-
ing Systems.
Together with the labelling scheme specified in ISO 9293, lSO/lEC 7487-1
and ISO 7487-3 provide for another full data interchange between data
processing Systems.
In accordance with lSO/lEC 9983, flexible disk cartridges conforming to
this part of ISO/IEC 7487 should be designated as “ISO type 202”.

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SIST EN ISO/IEC 7487-1:1997
ISO/IEC 7487=1:1993(E)
INTERNATIONAL STANDARD 0 lSO/IEC
- Data interchange on
Information technology
130 mm (525 in) flexible disk cartridges using
modified frequency modulation recording at
7 958 ftprad, 1,9 tpmm (48 tpi), on both sides - ISO
type 202 -
Part 1:
Dimensional, physical and magnetic characteristics
editions of the Standards indicated below. Members
1 Scope
of IEC and ISO maintain registers of currently valid
International Standards.
This part of lSO/lEC 7487 specifies the dimensional,
physical and magnetic characteristics of the cartridge
ISO 7487-2: 1985, Information processing - Data
so as to provide physical interchangeability between
interchange on 130 mm (5.25 in) flexible disk car-
data processing Systems.
tridges using modified frequency modula tion record-
ing at 7 958 ftprad, 1,9 tpmm (48 tpi), on bo th sides
- Part 2: Track format A.
2 Conformance
ISO 7487-3: 1986, Information processing - Data
A flexible disk cartridge shall be in conformance with
interchange on 130 mm (5.25 in) flexible disk car-
ISO 7487 when it meets all the requirements of
tridges using modified frequency modula tion record-
lSO/lEC 7487-1 and those of either ISO 7487-2 or
ing at 7 958 ftprad, 1,9 tpmm (48 tpi), on bo th sides
ISO 7487-3.
- Part 3: Track format B.
NOTE 1 Numeric values in the SI and/or Imperial
ISO 7665:1983, Information processing - File struc-
measurement System in this International Standard may
have been rounded off and therefore are consistent with, ture and labelling of flexible disk cartridges for infor-
but not exactly equal to, each other. Either System may be
ma tion in terchange.
used, but the two should be neither intermixed nor recon-
verted. The original design was made using Imperial units ISO 9293:1987, Information processing - Volume
and further developments were made using SI units.
and file structure of flexible disk cartridges for infor-
ma tion in terchange.
3 Normative references
4 Definitions
The .following Standards contain provisions which,
through reference in this text, constitute provisions
For the purposes of this part of lSO/lEC 7487, the
of this part of ISO/lEC 7487. At the time of publi-
following definitions apply.
cation, the editions indicated were valid. All Standards
are subject to revision, and Parties to agreements
4.1
based on this patt of lSO/lEC 7487 are encouraged to flexible disk: A flexible disk which accepts and
investigate the possibility of applying the most recent retains on the specified side or sides magnetic Signals
1

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SIST EN ISO/IEC 7487-1:1997
0 ISO/tEC
ISO/IEC 7487=1:1993(E)
4.9 in-contact: An operating condition in which the
intended for input/output and storage purposes of in-
magnetic surface of the disk intended for data storage
formation data processing and associated Systems.
is in physical contact with the magnetic heads.
4.2 master Standard reference flexible disk car-
4.10 formatting: Writing the proper control infor-
tridge: A reference flexible disk cartridge selected as
mation, establishing the physical tracks, and desig-
the Standard for reference fields, Signal amplitudes,
nating the addresses of physical records an the
resolution, and overwrite. Track 00 and Track 39 on
flexible disk’s surfaces.
each side are defined as reference tracks.
4.11 initialization: Writing the volume label, the
NOTE 2 The Master Standard has been established by
ERMAP label and other information initially required
the Physikalisch-Technische Bundesanstalt (PTB), Bundes-
allee 100, 0-38023 Braunschweig, Germany. to be on the flexible disk cartridge Prior to the com-
mencement of general processing or use.
4.3 secondary Standard reference flexible disk
4.12 recording area: That area of each disk surface
cartridge: A flexible disk cartridge, the Performance
with which the head may come into contact.
of which is known and stated in relation to that of the
master Standard reference flexible disk cartridge.
5 General description
NOTE 3 Secondary Standard reference flexible disk car-
tridges may be ordered from PTB Lab 1.41 under part
number RM 7487, as long as available. lt is intended that
5.1 General figures
these be used for calibrating tertiary cartridges for use in
routine calibrations.
A typical flexible disk cartridge is represented in fig-
Ures 1 and 2.
4.4 typical field (for each side): The minimum re-
cording field, which, when applied to a flexible disk
5.2 Main elements
cartridge, Causes a Signal output equal to 95 % of the
maximum average Signal amplitude when taken as a
The main elements of this flexible disk cartridge are:
function of the recording field at the specified track
and flux transition frequency of that flexible disk car-
- the disk;
tridge.
- the liner;
4.5 reference field: The typical field of the Signal
- the jacket.
amplitude reference flexible disk cartridge. There are
two reference fields, one for each side.
The cartridge is stored in an envelope.
4.6 test recording current (for each side): The cur-
5.3 Description
rent between 145 % and 155 % of the current which
produces the reference field at 125 000 flux tran-
The jacket is of a Square form. lt includes a central
sitions per second (ftps) on track 00 on both sides.
window, an index window and a head window in both
sides.
4.7 Standard reference amplitude (SRA) (for each
The liner is fixed to the inside of the jacket. lt com-
side): The average Signal amplitudes derived from the
prises two layers of material between which the disk
reference tracks of the master Standard reference
is held. The liner has the same openings as the jacket.
flexible disk cartridge using the appropriate test re-
cording current.
The disk has only a central window and an index
window.
SRA, is the average Signal amplitude from a recording
written using 125 000 ftps 6).
5.4 Optional features
SRA2 is the average Signal amplitude from a recording
written using 250 000 ftps (f2).
The interchange characteristics of the cartridge allow
for variations in its construction, as follows:
4.8 average Signal amplitude: The arithmetically
averaged value for a track of the output voltages - the jacket may include flaps (for example three
measured peak-to-peak over the whole track. flaps as shown in the figures, or none);

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SIST EN ISO/IEC 7487-1:1997
0 lSO/IEC ISO/IEC 74879l:l993(E)
- the centre of the disk may be reinforced by hub
- the jacket may include notches along the refer-
support rings (see annex D).
ence edge;
A-A
/- Side 0
Jacket
Liner
Disk Flap
Liner 1
- Jacket
Side 1
- Side 0
Central window
- Jacket
Index window
y Disk
-
7 A
- Head window
Figure 1 - Flexible disk cartridge

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SIST EN ISO/IEC 7487-1:1997
ISO/IEC 7487=1:1993(E)
Labelarea
Figure 2 -
Protective envelope with cartridge

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SIST EN ISO/IEC 7487-1:1997
0 ISO/IEC ISO/IEC 7487~‘1:1993(E)
19
t
/3 Side 0
/
I I WA I
1
1
4
4
(6
-I - w Referenceedge
43
L -
t
40
I
111
6
42
113
I
4
y
m
Figure 3 - Jacket dimensions
The temperature and the relative humidity shall be
6 General requirements
measured in the air immediately surrounding the car-
tridge.
The stray magnetic field at any Point on the disk sur-
6.1 Environment and transportation
face, including that resulting from the concentrating
effect of the recording head, shall not exceed
4 000 A/m (50 Oe).
6.1.1 Testing environment
Tests and measurements made on the cartridge to
6.1.2 Operating environment
check the requirements of this International Standard
shall be carried out under the following conditions:
Cartridges used for data interchange shall be operated
under the following conditions:
- temperature: 23 “C & 2 “C (73 “F -f 4 “F);
- temperature: 10 “C to 51,5 “C (50 OF to 125 OF);
- relative humidity: 40 % to 60 %;
- relative humidity: 20 % to 80 Yo;
- conditioning before testing: 24 h minimum.

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SIST EN ISO/IEC 7487-1:1997
~3 lSO/IEC
ISO/IEC 7487=1:1993(E)
- wet-bulb temperature: less than 29 “C (84 “F). - maximum rate of temperature Change: 20 “C
(68 OF) per hour;
The temperature and the relative humidity shall be
measured in the air immediately surrounding the car-
- relative humidity: 8 % to 90 %. To be measured
tridge. lt is recommended that the rate of Change of
only when temperature is 5 “C (41 “F) or greater.
the temperature should not exceed 20 “C (68 “F) per
There should be no deposit of moisture on or in the
hour.
cartridge.
There shall be no deposit of moisture on or in the
cartridge.
6.1.5 Handling
The stray magnetic field at any Point on the disk sur-
The cartridge shall remain out of its envelope for the
face, including that resulting from the concentrating
shortest time possible. When handling the cartridge
effect of the recording head, shall not exceed
the Operator shall not tauch the exposed magnetic
4 000 A/m (50 Oe).
surfaces of the disk and shall avoid exposing the car-
tridge to direct sunlight, moisture and dust.
6.1.3 Storage environment
6.2 Materials
under the
During storage the cartridges shall be kept
following conditions:
6.2.1 Jacket
- temperature: 4 “C to 51,5 “C (40 “F to 125 “F);
The jacket may be constructed from any suitable ma-
- relative humidity: 8 % to 80 %.
terial (for example, Vinyl chloride sheet).
Esch cartridge shall be in an envelope and in an up-
6.2.2 Liner
right Position.
The material of the liner shall be able to retain dust
There shall be no deposit of moisture on or in the
without darnage to the disk (for example, nonwoven
cartridge.
fabric).
The ambient stray magnetic field at any Point on the
disk surface shall not exceed 4 000 A/m (50 Oe).
6.2.3 Disk
NOTE 4 Cartridges which have been stored at tempera-
The disk may be constructed from any suitable ma-
tures and humidities outside the operating conditions tan
terial (for example, biaxially oriented polyethylene
exhibit degraded Performance characteristics. Such car-
terephthalate) coated on both sides with a strong and
tridges should be subjected to a conditioning period of not
flexible layer of magnetic material (for example,
less than 24 h within the operating environment Prior to
y - Fe,O,L
use.
6.2.4 Envelope
6.1.4 Transportation
The envelope may be manufactured from any suitable
Responsibility for ensuring that adequate precautions
material (for example, Paper).
are taken during transportation shall be with the
sender. During transportation the cartridge shall be in
its envelope and in a protective package. The latter
6.3 Direction of rotation
shall be free from dust or extraneous matter. lt shall
have a clean interior and construction to minimize
The direction of rotation shall be counterclockwise
ingress of dust and moisture. lt is recommended that
when looking at side 0.
a sufficient space exists between cartridge and outer
surface of the final Container so that risk of darnage
due to stray magnetic fields will be negligible. 7 Dimensional characteristics
lt is recommended that the following conditions are
The dimensional characteristics listed in the following
not exceeded:
subclauses are indicated in figures 3 to 5.
- temperature: - 40 “C to 51,5 “C (- 40 “F to All dimensions are referred to the reference edge of
125 “F); the cartridge (see figure3).
6

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SIST EN ISO/IEC 7487-1:1997
0 lSO/IEC
ISO/IEC 7487-1: 1993
f4 = 60,OO mm + 0,25 mm (2,362 in + 0,010 in
7.1 Jacket - -
7.1.4.2 Diameter
7.1.1 Form
The diameter of the index windows shall be
The jacket shall have a Square form with angles of
90” + 30’, and a side length
4 = 6,35 mm + 0,20 mm (0,250 in + 0,008 in)
-
1 = 133,3 mm + 0,4 mm (5,250 in + 0,015 in)
-
1
7.1
...