Electromagnetic mechanism moving a disk-drive head assembly.

Corresponding tracks across multiple platter surfaces.

Assembly containing the laser and optical components.

Platter area where heads may rest when parked.

Filesystem allocation unit containing multiple sectors.

Motor rotating optical media.

Small memory area buffering hard-drive data.

Movement of a hard-drive head to a target track.

Mechanism holding an optical disc.

Flash phenomenon where repeated reads can affect nearby cells.