ANSI INCITS 120 : 1984 : R2017

1 Scope
2 General Requirements
  2.1 Operation and Storage Environment
  2.2 Test Conditions
  2.3 Material
  2.4 Coefficient of Thermal Expansion
3 Dimensions
  3.1 General
  3.2 Inner Diameter
  3.3 Outer Diameter
  3.4 Concentricity
  3.5 Thickness
  3.6 Edge Condition
  3.7 Clamping Area
  3.8 Location of Flyable Magnetic Surfaces
4 Physical Characteristics
  4.1 Moment of Inertia
  4.2 Maximum Speed
  4.3 Runout
  4.4 Surface Roughness
  4.5 Durability of Magnetic Surfaces
  4.6 Lubrication of Magnetic Surfaces
  4.7 Head/Disk Friction
  4.8 Head/Disk Stiction
  4.9 Cleaning of the Magnetic Surfaces
  4.10 Discharge Path
5 Testing of Magnetic Characteristics
  5.1 Test Conditions
  5.2 Track and Recording Information
  5.3 Standard Reference Surface
  5.4 Test Head
  5.5 Conditions for Test Head Measurements
  5.6 Read Channel
  5.7 Automatic Gain Controlled Amplifier
  5.8 Track Average Amplitude
  5.9 Test Signals
  5.10 DC Erasure
6 Surface Tests
  6.1 Amplitude Test
  6.2 Resolution Test
  6.3 Overwrite Test
  6.4 Residual Noise Test
7 Track Quality Test
  7.1 Positive Modulation Test
  7.2 Negative Modulation Test
  7.3 Missing Pulse Test
  7.4 Extra Pulse Test
8 Acceptance Criteria for Magnetic Surfaces
  8.1 Surface Test Criteria
  8.2 Track Quality (Modulation) Criteria
9 Defects of the Magnetic Surfaces
  9.1 Single Defect
  9.2 Defect Criteria
Appendixes
Appendix A Class 100 Air Cleanliness
Figure A1 Relationship of Particle Size to Amount of Particles
Appendix B Measurement of the Effective Track Width
Figure B1 Effective Track Width
Appendix C Recommended Procedure for Measuring Frictional
            Coefficient between Head and Disk
Figures
Figure C1 Friction Test Setup
Figure C2 Experimental Result with Unlubricated Disk
Figure C3 Experimental Result with Properly Lubricated Disk
Figure C4 Experimental Result with Over or Uneven Lubrication of
            Disk
Figure C5 Experimental Result with Stiction on Disk