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