Device Driver Errors

 When a device driver receives an invalid request or encounters an error
 during operation, the Device Status Word error bit (bit 15) should be set
 and one of the following error codes should be placed in the low 8 bits
 of the rStatus field of the DevRequestHdrRec.

 Err  Description                    █ Err  Description
 ▀▀▀  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ █ ▀▀▀  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
 00H  write protect violation        █ 09H  printer out of paper
 01H  unknown unit                   █ 0aH  write fault
 02H  device not ready               █ 0bH  read fault
 03H  unknown command                █ 0cH  general failure
 04H  CRC error                      █ 0dH  (reserved)
 05H  bad request structure length   █ 0eH  (reserved)
 06H  seek error                     █ 0fH  invalid disk change (DOS 3.0+)
 07H  unknown media                  █
 08H  sector not found               █

    Note: These codes are propagate around the system and show up in
          INT 24H (Critical Error Handler), and as DOS Error Codes returned
          by various DOS functions and fn 59H.

          When returned by DOS to an application, 13H has been added to the
          code (for instance, if the driver returns 06H, DOS returns 19H to
          the application.

See Also: Device Drivers
          Device Requests
          Device Request Header
          Device Status Word