Compatibility: 3.2+
Expects: AX    440dH
BX    drive (0=default, 1=A, 2=B, etc.)
CL    61H
CH    08H (device category: block device)
DS:DX addr of an IoctlRdWrtTrackRec identifying the size and disk
location of the block to read and the memory address to
store the data.
Returns: AX    error code  if CF is set to CY
DS:DX the buffer at IoctlRdWrtTrackRec.rwBuffer is filled with the
requested data
Info: Read an entire trackful of data from a block device to memory.
This could be used as part of a system to duplicate the entire
contents of a disk.

Carefully fill the IoctlRdWrtTrackRec with all the information
needed before calling.  You may use Fn 440dH 60H (query device
parameters) to obtain information about a track on the specified

See Also: Fn 44H (IOCTL)
Fn 440dH (generic IOCTL for block devices)
Fn 440dH 41H (write disk track)
Fn 440dH 60H (query device parameters)
Fn 440dH 62H (verify disk track)
- -

DOS Fn 440dH CL=61H: IOCTL Read Track on Logical Drive