Function 440Dh (68-13)   IOCTL: Generic IOCTL Request                 DOS 3.2

This subfuntion provides low-level control over a block device.

On entry:      AH         44h
AL         0Dh
BL         Drive number (0=default, 1=A, etc.)
CH         08h (Major code)
CL         Minor code:
40h = Set device parameters
60h = Get device parameters
41h = Write track on logical device
61h = Read track on logical device
42h = Format and verify track on logical
device
62h = Verify track on logical device
DS:DX      Pointer to parameter block

                                                                          

See also: 44h

440Dh (68-13) IOCTL: Generic IOCTL Request >= DOS 3.2