ANSI INCITS 125 : 1985 : R2006

1 Scope, Purpose, and Application
  1.1 Scope
  1.2 Purpose
  1.3 Application
2 Referenced Standards
  2.1 American National Standard
  2.2 Other Standards
3 Definitions
4 General Requirements
  4.1 Environment
  4.2 Materials
  4.3 Disk Cartridge Assembly
5 Physical Requirements
  5.1 Dimensions
  5.2 Torque
  5.3 Physical Properties of the Coated Disk
  5.4 Disk Coating
  5.5 Magnetic Coating Resistivity
  5.6 Flammability
  5.7 Toxicity
6 Test Track Requirements (Track and Recording Information)
  6.1 Number
  6.2 Width
  6.3 Location
  6.4 Physical Identification
  6.5 Index
7 Standard Reference Surfaces
  7.1 General
  7.2 Primary Standard Amplitude Reference Surfaces
  7.3 Secondary Standard Amplitude Reference Surfaces
8 Magnetic Characteristics
  8.1 Data Surfaces
  8.2 Signal Quality
Figures
Appendixes
Appendix A - Optic System for Light-Transmittance Measurement of
             Flexible Disk
Figure A1 - Optic System for Light-Transmittance Measurement of
            Flexible Disk
Appendix B - Drop-Thru Test Gauge
Figure B1 - Drop-Thru Test Gauge
Appendix C - Abrasivity Evaluation
C1 - Comparative Disk
C2 - Wear Test Disk
C3 - Wear Revolution
C4 - Test Procedure

Describes the general, physical, and magnetic requirements for the interchangeability of the two-sided, 5.25 inch (130 mm) (nominal), 48 tracks-per-inch (tpi) 1,9 tracks-per-millimeter (tpmm) flexible disk cartridge (for 7958 bits-per-radian (bpr) use) as required to achieve unformatted disk cartridge interchange among disk drives using 40 tracks per side and associated information processing systems.