AS 3631.2-1989

1 - AS 3631.2-1989 INFORMATION PROCESSING SYSTEMS-DATA INTERCHANGE ON 90 mm FLEXIBLE DISK CARTRIDGES USING MODIFIED FREQUENCY...
4 - PREFACE
5 - Contents
7 - 0 Introduction
7 - 1 Scope and field of application
7 - 2 Conformance
7 - 3 References
7 - 4 General requirements
7 - 4.1 Mode of recording
7 - 4.2 Track location tol erance of the recorded flexible disk cartridge
7 - 4.3 Recording offset angle
8 - 4.4 Density of recording
8 - 4.5 Flux transition spacing
9 - 4.6 Average Signal Amplitude
9 - 4.7 Byte
9 - 4.8 Sector
9 - 4.9 Cylinder
9 - 4.10 Cylinder number
9 - 4.11 Data capacity of a track
9 - 4.12 Hexadecimal notation
9 - 4.13 Error Detection Characters (EDC)
9 - 5 Track layout
9 - 5.1 Index Gap
9 - 5.2 Sector Identifier
10 - 5.2.1 Identifier Mark
10 - 5.2.2 Address Identifier
10 - 5.3 Identifier Gap
10 - 5.4 Data Block
10 - 5.4.1 Data Mark
10 - 5.4.2 Data Field
10 - 5.4.3 EDC
10 - 5.5 Data Block Gap
10 - 5.6 Track Gap
10 - 6 Coded representation of data
10 - 6.1 Standards
10 - 6.2 Coding methods
12 - Annex A - EDC implementation
13 - Annex B - Procedure and equipment for measuring flux transition spacing
13 - B.1 General
13 - B.2 Format
13 - B.3 Test equipment
14 - B.4 Procedure for measurement
15 - Annex C - Data separators for decoding MFM recording
16 - Bibliography

Part 2 specifies the characteristics of 90 mm flexible disk cartridges recorded at 7958 ftprad using modified frequency modulation (MFM) recording on 80 tracks on each side. It is identical to and has been reproduced from ISO Standard 8860 - Data interchange on 90 mm (3.5 in) flexible disk cartridges using modified frequency modulation recording at 7958 ftprad on 80 tracks on each side - Part 2: 1987 Track format.

This part of ISO 8860 specifies the track layout, the track format and the characteristics of recorded signals.NOTE Numeric values in the SI and/or Imperial measurement system in this part of ISO 8860 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 SI units.