Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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▀ When supported by the driver, this subfunction can be used to request
  hardware-dependent operations (such as tape rewind or disk eject) that
  are not provided by other MS-DOS function calls.
 
▀ Block device drivers are not required to support IOCTL Subfunction 05H.
  If this subfunction is requested and the driver does not have the ability
  to process control data, control returns to the program with the carry
  flag set and error code 0001H (invalid function) in register AX.
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