#disk_space__disc_space  (computer science) the space available on a magnetic disk
  supertype:  #space.area  an area reserved for some particular purpose; "the laboratory's floor space"
  subtype:  #disk_overhead__overhead  (computer science) the disk space required for non-data information (used for location and timing)
  subtype:  #swap_space__swap_file  the disk space that is set aside for virtual memory

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