Function 44h I/O Control for Devices (IOCTL) Get or Set Device Information
entry AH 44h
AL 0Dh Block Device Request (DOS 3.3+)
BL drive number (0=default)
CH major subfunction
CL minor subfunction
40h set device parameters
41h write logical device track
42h format and verify logical device track
60h get device parameters
61h read logical device track
62h verify logical device track
DS:DX pointer to parameter block
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