#magnetic_disk__magnetic_disc__disk__disc  (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
  supertype:  #memory_device__storage_device__storagedevice  a device that preserves information for retrieval
  subtype:  #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"
  subtype:  #hard_disc__hard_disk__fixed_disk__fixeddisk  a rigid magnetic disk mounted permanently in a drive unit
     subtype:  #removable_disk__removabledisk  a hard disk that can be removed from the disk drive; removal prevents unauthorized use

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