#hard_disc__hard_disk__fixed_disk__fixeddisk  a rigid magnetic disk mounted permanently in a drive unit
  supertype:  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
  part of:  disk_drive
  subtype:  removable_disk__removabledisk  a hard disk that can be removed from the disk drive; removal prevents unauthorized use

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