ANSI INCITS 179 : 1990 : R2017

1 Scope
2 Referenced Standard
3 General Requirements
   3.1 Operation and Storage Environment
   3.2 Test Conditions
   3.3 Material
   3.4 Coefficient of Thermal Expansion
4 Dimensions
   4.1 General
   4.2 Inner Diameter
   4.3 Outer Diameter
   4.4 Concentricity
   4.5 Thickness
   4.6 Edge Condition
   4.7 location of Flyable Magnetic Surfaces
5 Physical Characteristics
   5.1 Moment of Inertia
   5.2 Maximum Speed
   5.3 Runout
   5.4 Surface Roughness
   5.5 Durability of Magnetic Surfaces
   5.6 Protection of Magnetic Surfaces
   5.7 Head/Disk Friction
   5.8 Head/Disk Stiction
   5.9 Head/Disk Impact
   5.10 Cleaning of the Magnetic Surfaces
6 Testing of Magnetic Characteristics
   6.1 Test Conditions
   6.2 Track and Recording Information
   6.3 Reference Surfaces
   6.4 Test Head
   6.5 Conditions for Test Head Measurements
   6.6 Read Channel
   6.7 Automatic Gain Controlled Amplifier
   6.8 Track Average Amplitude (V[TA])
   6.9 DC Erasure
7 Surface Tests
   7.1 Amplitude Test
   7.2 Resolution Test
   7.3 Overwrite Test
   7.4 Residual Noise Test
8 Track Quality Test
   8.1 Positive Modulation Test
   8.2 Negative Modulation Test
   8.3 Missing Pulse Test
   8.4 Extra Pulse Test
9 Acceptance Criteria for Magnetic Surfaces
   9.1 Surface Test Criteria
   9.2 Track Quality Modulation Criteria
10 Defects of Magnetic Surfaces
   10.1 Single Defect
   10.2 Defect Criteria
Appendixes
Appendix A Class 100 Air Cleanliness
  A1. Definition
  A2. Test Method
  A3. Related Publications
Figure A1 Relationship of Particle Size to Amount of Particles
Appendix B Recommended Procedure for Measuring Frictional
            Coefficient between Head and Disk
Figures
Figure B1 Friction Test Setup
Figure B2 Experimental Result with Unlubricated Disk
Figure B3 Experimental Result with Properly Lubricated Disk
Figure B4 Experimental Result with Over or Uneven Lubrication
            of Disk
Figure B5 Experimental Result with Stiction on Disk
Appendix C Recommended Procedure for Measuring Head/Disk Impact
            Durability
Figures
Figure C1 Test Fixture
Figure C2 Conceptual Schematic of Impact Test Method
Figure C3 Illustration of a Typical Acceleration of Amplitude
            Measurement

Gives mechanical, physical and magnetic properties of low-friction disks with diameters of 95 mm (3.740 inch) and with a recording density of 31.5 tracks per millimeter (tpmm) (800 tracks per inch (tpi) with 567 flux transitions per millimeter (ftpmm) (14400 flux transitions per inch (ftpi) at a radius of 23 mm (0.900 inch).