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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

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