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 Issue block device generic IOCTL request

 This function requests a block device driver to perform
 one of the following subfunctions:

 INT 21h, 440Dh, 60h  Get device parameters
 INT 21h, 440Dh, 40h  Set device parameters
 INT 21h, 440Dh, 61h  Read track on a logical device
 INT 21h, 440Dh, 41h  Write track on a logical device
 INT 21h, 440Dh, 42h  Format and verify track on a logical device
 INT 21h, 440Dh, 62h  Verify track on a logical device
 INT 21h, 440Dh, 67h  Get access flag status
 INT 21h, 440Dh, 47h  Set access flag status

 (functions 43h-46h and 63h-66h are reserved for the system).