magnetic disk

noun Computers.

1. Also called disk, hard disk. a rigid disk coated with magnetic material, on which data and programs can be stored.
2. floppy disk.

noun

1. computing another name for disk (def. 2)

1. A memory device, such as a floppy disk or a hard disk, that is covered with a magnetic coating. Digital information is stored on magnetic disks in the form of microscopically small, magnetized needles, each of which encodes a single bit of information by being polarized in one direction (representing 1) or the other (representing 0).