AS 2910-1986

1 - AS 2910-1986 INFORMATION PROCESSING - DATA INTERCHANGE ON 130 MM (5.25 IN) 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 Definitions
7 - 4.1 flexible disk:
7 - 4.2 reference flexible disk cartridge:
7 - 4.3 secondary reference flexible disk cartridge:
7 - 4.4 signal amplitude reference flexible disk cartridge
7 - 4.5 typical field
8 - 4.6 reference field:
8 - 4.7 test recording current
8 - 4.8 standard reference amplitude
8 - 4.9 average signal amplitude
8 - 4.10 in-contact:
8 - 4.11 formatting:
8 - 4.12 initialization:
8 - 4.13 recording area:
8 - 5 General description
8 - 5.1 General figures
8 - 5.2 Main elements
8 - 5.3 Description
8 - 5.4 Optional features
8 - 6 General requirements
8 - 6.1 Environment and transportation
8 - 6.1.1 Testing environment
8 - 6.1.2 Operating environment
9 - 6.1.3 Storage environment
9 - 6.1.4 Transportation
9 - 6.1.5 Handling
9 - 6.2 Materials
9 - 6.2.1 Jacket
9 - 6.2.2 Liner
9 - 6.2.3 Disk
9 - 6.2.4 Envelope
9 - 6.3 Direction of rotation
9 - 7 Dimensional characteristics
9 - 7.1 Jacket
9 - 7.1.1 Form
10 - 7.1.2 Thickness
10 - 7.1.3 Central windows
10 - 7.1.4 Index windows
10 - 7.1.5 Head windows
10 - 7.1.6 Reference edge profile
10 - 7.1.7 Construction of the jacket
10 - 7.1.8 Notches
10 - 7.1.9 Write-enable notch
11 - 7.2 Liner
11 - 7.3 Disk
11 - 7.3.1 Diameter
11 - 7.3.2 Thickness
11 - 7.3.3 Index window
11 - 7.3.4 Recording area
11 - 7.3.5 Sides
11 - 8 Physical characteristics
11 - 8.1 Inflammability
11 - 8.2 Coefficient of linear thermal expansion of the disk
11 - 8.3 Coefficient of linear hygroscopic expansion of the disk
11 - 8.4 Opacity
11 - 8.4.1 Opacity of the jacket
11 - 8.4.2 Opacity of the disk
11 - 8.5 Torque
11 - 8.5.1 Starting torque
11 - 8.5.2 Running torque
12 - 9 Magnetic characteristics
12 - 9.1 Track geometry
12 - 9.1.1 Number of tracks
12 - 9.1.2 Width of tracks
12 - 9.1.3 Track location
12 - 9.1.4 Track number
12 - 9.1.5 Index
12 - 9.2 Functional testing
12 - 9.2.1 Surface tests
13 - 9.2.2 Track quality tests
13 - 9.2.3 Rejection criteria
13 - 10 Bibliography
13 - 11 Marking
14 - Figure 1 - Flexible disk cartridge
14 - Figure 2 - Section A-A
14 - Figure 3 - Protective envelope with cartridge
15 - Figure 4 - Jacket dimensions
16 - Figure 5 - Cartridge thickness
16 - Figure 6 - Disk dimensions
16 - Figure 7 - Disk thickness
16 - Figure 8 - Pressure pad area
17 - Annex A - Measurement of the cartridge thickness
17 - A.1 Maximum thickness
17 - A.2 Minimum thickness
19 - Annex B - Measurement of light transmittance
19 - B.0 Introduction
19 - B.1 Description of the measuring equipment
20 - B.2 Measuring method
21 - Annex C - Method for measuring the effective track width
22 - Annex D - Use of hub support rings

Specifies the dimensional, physical and magnetic characteristics of the 130 mm flexible magnetic disk cartridges so as to provide physical interchangeability between data processing systems. (Commonly known as double sided, double density disks.) Identical with ISO 7487-1:1985.

This part of ISO 7487 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 International Standard 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 Imperial units and further developments were made using SI units.