BS ISO/IEC 13422:1994

Foreword
Introduction
1. Scope
2. Conformance
2.1 Flexible Disk Cartridge
2.2 Generating systems
2.3 Receiving systems
3. Normative references
4. Definitions
4.1 Average Signal Amplitude
4.2 case
4.3 data track
4.4 Error Detecting Code
4.5 Flexible Disk Cartridge
4.6 flux transition frequency
4.7 hub
4.8 liner
4.9 MFM recording mode
4.10 Master Standard Reference Flexible Disk Cartridge
4.11 peak value
4.12 primary identification hole
4.13 Reference Field
4.14 Secondary Standard Reference Flexible Disk
        Cartridge
4.15 secondary identification hole
4.16 sector servo
4.17 servo track
4.18 shutter
4.19 Standard Reference Amplitude
4.20 Typical Field
4.21 write-inhibit hole
5. Conventions and Notations
5.1 Representation of numbers
5.2 Acronyms
6. General description
6.1 Drawings
6.2 Main elements
6.3 Description
6.4 Marking of the Flexible Disk Cartridge
7. General requirements
7.1 environment and transportation
7.1.1 Testing environment
7.1.2 Operating environment
7.1.3 Storage environment
7.1.4 Transportation
7.2 Materials
7.2.1 Case
7.2.2 Liner
7.2.3 Disk
7.2.4 Hub
8. Dimensional characteristics
8.1 Case
8.1.1 Shape
8.1.2 Thickness
8.1.3 Hub access hole
8.1.4 Locating holes
8.1.5 Label area
8.1.6 Head windows
8.1.7 Write-inhibit hole
8.1.8 Identification holes
8.1.9 Profile of the shutter edge of the case
8.1.10 Shutter
8.2 Liner
8.3 Disk
8.3.1 Diameter
8.3.2 Thickness
8.4 Hub
8.4.1 Dimensions
8.4.2 Hub orientation holes
8.5 Optional handling notches
8.6 Interface between cartridge and drive
8.7 Compliance
9. Physical characteristics
9.1 Flammability
9.2 Coefficient of linear thermal expansion of the disk
9.3 Coefficient of linear hygroscopic expansion of
        the disk
9.4 Torque
9.4.1 Starting torque
9.4.2 Running torque
10. Magnetic characteristics
10.1 Recording area
10.2 Track geometry
10.2.1 Number of tracks
10.2.2 Width of tracks
10.2.3 Track location
10.2.4 Track number
10.3 Functional testing
10.3.1 Surface tests
10.3.2 Track quality tests
10.3.3 Rejection criteria
11. General requirements of the data track recording
11.1 Method of recording
11.2 Track location tolerance of the recorded Flexible
        Disk Cartridge
11.3 Recording offset angle
11.4 Density of recording
11.5 Flux transition spacing
11.6 Average Signal Amplitude
11.7 Byte
11.8 Sector
11.9 Cylinder
11.10 Cylinder number
11.11 Data capacity of a track
11.12 Special MFM recording signals
11.13 Error Detecting Code
11.14 Defective sector
12. Data track layout
12.1 Index Gap
12.2 Sector Identifier
12.2.1 Identifier Mark
12.2.2 Address Identifier
12.3 Identifier Gap
12.4 Data Block
12.4.1 Data Mark
12.4.2 Data Field
12.4.3 EDC
12.5 Data Block Gap
13. General requirements of the servo track recording
13.1 General
13.2 Method of recording
13.3 Servo track
13.3.1 Number of tracks
13.3.2 Width of tracks
13.3.3 Track location
13.3.4 Track number
13.4 Average Signal Amplitude of Servo Data
13.5 Fluctuation of signal amplitude of Servo Data
14. Servo track layout
14.1 Deviation between the data track and the servo
        track
14.2 Servo area timing
14.2.1 Servo Identifier
14.2.2 Servo Data
Annexes
A. Test for compliance
B. Measurement of light transmittance
C. Method for measuring the effective track width
D. Procedure and equipment for measuring flux
      transition spacing
E. Data separators for decoding MFM recording
F. EDC implementation
G. Cartridge distortion test gauge
H. Method of measuring peak shift
J. Servo track recording conditions
K. Method for measuring fluctuation of the Servo Data
      amplitude
L. Institute for the supply of Secondary Standard
      Reference Flexible Disk Cartridges

Specifies the characteristics of 90 mm Flexible Disk Cartridges of 10 MByte formatted capacity, using modified frequency modulation recording and sector servo tracking on 255 data tracks on each side. Specifies the mechanical, physical and magnetic characteristics of the cartridge (ISO Type 304), so as to provide physical interchangeability between data processing systems. Also specifies the quality of recorded signals, the method of recording, the track layout and the track format of data tracks and servo tracks.

This International Standard specifies the characteristics of 90 mm Flexible Disk Cartridges of 10 MByte formatted capacity, recorded at 33 157 ftprad using modified frequency modulation recording and sector servo tracking on 255 data tracks on each side. Such Flexible Disk Cartridges are identified as ISO Type 304.

It specifies the mechanical, physical and magnetic characteristics of the cartridge, so as to provide physical interchangeability between data processing systems.

It also specifies the method of recording, the quality of the recorded signals, the track layout and the track format of data tracks and servo tracks.

Together with a standard for volume and file structure, for example International Standard ISO 9293, this International Standard provides for full data interchange between data processing systems.