See: Fn 440dH 40H (set device parameters)           3.2+

Fn 440dH 41H (write track)                     3.2+
Fn 440dH 42H (format and verify track)         3.2+

Fn 440dH 46H (set media ID)                    4.0+
Fn 440dH 47H (set disk access flag)            4.0 only
Fn 440dH 60H (get device parameters)           3.2+

Fn 440dH 61H (read track)                      3.2+
Fn 440dH 62H (verify track)                    3.2+

Fn 440dH 66H (query media ID)                  4.0+
Fn 440dH 67H (query disk access flag)          4.0 only
Fn 440dH 68H (sense media type)                5.0+

Info: These functions require a "minor code" value in the CL register
as well as the 440dH in AX.

See Also: Fn 44H (IOCTL)
Fn 440cH (generic IOCTL for character devices)
- -

DOS Fn 440dH: Generic I/O Control -- Block Devices