AS 3631.1-1989

1 - AS 3631.1-1989 INFORMATION PROCESSING SYSTEMS-DATA INTERCHANGE ON 90 mm FLEXIBLE DISK CARTRIDGES USING MODIFIED FREQUENCY MOD
4 - PREFACE
5 - Contents
7 - 0 Introduction
7 - 1 Scope and field of application
7 - 2 Conformance
7 - 3 References
7 - 4 Definitions
7 - 4.1 recording disk:
7 - 4.2 hub:
7 - 4.3 shutter:
7 - 4.4 liner:
7 - 4.5 case:
7 - 4.6 Master Standard Reference Flexible Disk Cartridge
7 - 4.7 Secondary Standard Reference Flexible Disk Cartridge
8 - 4.8 Typical Field:
8 - 4.9 Reference Field:
8 - 4.10 Test Recording Current:
8 - 4.11 Standard Reference Amplitudes (SRAs):
8 - 4.12 Average Signal Amplitude:
8 - 4.13 in-contact:
8 - 4.14 side:
8 - 4.15 direction of rotation:
8 - 4.16 index:
8 - 4.17 formatting:
8 - 4.18 initialization:
8 - 5 General description
8 - 5.1 Figures
8 - 5.2 Main elements
8 - 5.3 Description
8 - 6 General requirements
8 - 6.1 Environment and transportation
8 - 6.1.1 Testing environment
9 - 6.1.2 Operating environment
9 - 6.1.3 Storage environment
9 - 6.1.4 Transportation
9 - 6.2 Materials
9 - 6.2.1 Case
9 - 6.2.2 Liner
9 - 6.2.3 Disk
9 - 6.2.4 Hub
9 - 7 Dimensional characteristics
9 - 7.1 Case
9 - 7.1.1 Shape
9 - 7.1.2 Thickness
10 - 7.1.3 Hub access hole
10 - 7.1.4 Locating holes
10 - 7.1.5 Label area
10 - 7.1.6 Head windows
10 - 7.1.7 Write-inhibit hole
11 - 7.1.8 Profile of the shutter edge of the case
11 - 7.1.9 Shutter
11 - 7.2 Liner
11 - 7.3 Disk
11 - 7.3.1 Diameter
11 - 7.3.2 Thickness
11 - 7.4 Hub
11 - 7.4.1 Dimensions
11 - 7.4.2 Hub orientation holes
12 - 7.5 Optional handling notches
12 - 7.6 Interface between cartridge and drive
12 - 7.7 Compliance
12 - 8 Physical characteristics
12 - 8.1 Inflammability
12 - 8.2 Coefficient of linear thermal expansion of the disk
12 - 8.3 Coefficient of linear hygroscopic expansion of the disk
12 - 8.4 Torque
12 - 8.4.1 Starting torque
13 - 8.4.2 Running torque without heads loaded
13 - 9 Magnetic characteristics
13 - 9.1 Recording area
13 - 9.2 Track geometry
13 - 9.2.1 Number of tracks
13 - 9.2.2 Width of tracks
13 - 9.2.3 Track location
13 - 9.2.4 Track number
13 - 9.3 Functional testing
13 - 9.3.1 Surface tests
14 - 9.3.2 Track quality tests
14 - 9.3.3 Rejection criterion
20 - Annex A - Test for compliance
22 - Annex B - Measurement of light transmittance
22 - B.1 Introduction
22 - B.2 Description of the measuring equipment
22 - B.3 Measuring method
24 - Annex C - Method for measuring the effective track width
25 - Annex D - Cartridge distortion test gauge
26 - Annex E - Method for measuring peak shift
26 - E.1 Introduction
26 - E.2 Description of the measuring equipment
26 - E.3 Method of test
27 - E.4 Definition

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 1:1987 Dimensional, physical and magnetic characteristics.

This part of ISO 8860 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 measurements 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 reconverted. The original design was made using SI units.