ANSI INCITS 171 : 1989 : R2005

1 Scope, Purpose, and Application
  1.1 Scope
  1.2 Purpose
  1.3 Application
  1.4 Conformance
2 Referenced and Related Standards
  2.1 Referenced American National Standards
  2.2 Other Referenced Standards
  2.3 Related American National Standard
3 Definitions
4 General Requirements
  4.1 Environment
  4.2 Materials
  4.3 Cartridge Assembly
5 Physical Requirements
  5.1 Dimensions and Tolerances
  5.2 Torque
  5.3 Physical Properties of Disk
  5.4 Magnetic Coating Resistivity
  5.5 Flammability
  5.6 Toxicity
6 Test Track Requirements (Track and Recording Information)
  6.1 Number
  6.2 Width
  6.3 Track Locations
  6.4 Physical Track Identification
  6.5 Direction of Rotation
7 Magnetic Characteristics
  7.1 Data Surfaces
  7.2 Signal Quality
Figures
Figure 1 Disk Case - Side 0
Figure 2 Disk Case - Side 1
Figure 3 Case without Shutter - Upper Part
Figure 4 Side 1 View and Hub Detail
Figure 5 Disk Operating Plane
Figure 6 Datum Planes
Figure 7 Support Details
Figure 8 Recording Offset Angle
Table 1 Dimensions for Figures 1, 2, and 3
Appendixes
Appendix A Abrasivity Evaluation
  A1. Abrasivity
  A2. Comparative Disk
  A3. Wear Test Disk
  A4. Wear Revolution
  A5. Test Procedure
Appendix B Compliance Test and Gauge for Cartridge
  B1. Purpose
  B2. Reference Zones
  B3. Load Force
  B4. Hub Shaft
  B5. Compliance
Appendix C Roughness
Appendix D Wear Resistance
Appendix E Peak Shift Measurement
  E1. Measurement Conditions
  E2. Definition
  E3. Test Circuit
  E4. Timing Diagram
Figures
Figure E1 Peak Shift Measurement Circuit
Figure E2 Timing Diagram
Appendix F Dimensions
Figure F1 Location of Drive Physical Index Pulse
Appendix G Drop-Through Gauge
Figure G1 Drop-Through Gauge
Appendix H Running Torque with Head(s) Loaded

Describes the general, physical, and magnetic requirements for interchangeability of the one- and two-sided, high density, 90 mm (3.5 in) (nominal) flexible disk cartridge for 15916 bits-per-radian (bpr) use as required to achieve unformatted disk cartridge interchange among disk drives using 80 tracks per side and associated information processing systems.