What hard disk drive is made of
Magnetic platters with heads (IBM 350).
- Electric motor — has part. A spindle motor.
- Ball bearing — has part. Bearings (later fluid-dynamic ones).
- Neodymium magnet — has part. The head actuator.
- Magnetism — uses. Magnetic recording.
- Aluminium — is made of. The platters are aluminium or glass.
- Cobalt — is made of. The magnetic layer is a cobalt alloy.