diskette, floppy, floppy disk - a small plastic magnetic disk enclosed in a stiff envelope with a radial slit; used to store data or programs for a microcomputer; "floppy disks are noted for their relatively slow speed and small capacity and low price"

fixed disk, hard disc, hard disk - a rigid magnetic disk mounted permanently in a drive unit

memory device, storage device - a device that preserves information for retrieval

computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures