#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
  subtype:  #removable_disk  a hard disk that can be removed from the disk drive; removal prevents unauthorized use
  part of:  #disk_drive__disc_drive__hard_drive__Winchester_drive  (computer science) computer hardware that holds and spins a magnetic or optical disk and reads and writes information on it

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