Particle size distribution
Position
Layout
Data processing equipment
Recording characteristics
Environment (working)
Magnetic materials
Moment of inertia
Test equipment
Velocity
Dimensions
Magnetic measurement
Design
Air
Test atmospheres
Storage
Performance testing
Chemical-resistance tests
Data media
Disk packs
Data layout
Computer peripheral equipment
Recording tracks
Height
Magnetic disks
Interchangeability
Diameter
Environmental cleanliness
Magnetic properties of materials
Strength of materials
Coatings
Durability
Roughness (surface)