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▀ If a file is not found as expected on a particular drive, a program can
  use this subfunction to determine whether the user should be prompted to
  insert another disk.
 
▀ This subfunction may not be used for a network drive.
 
▀ Block drivers are not required to support Subfunction 08H. If this sub-
  function is requested and the block device cannot supply the informa-
  tion, control returns to the program with the carry flag set and error
  code 0001H (invalid function) in register AX.
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