Compatibility: 2.0+
Expects: AX    4405H
BL    drive number (0=default, 1=A, 2=B, etc.)
CX    byte count (amount of data to send)
DS:DX Address of buffer containing data to send
                                                                  
Returns: AX    error code  if CF is set to CY
Number of bytes actually sent (if no error)
                                                                  
Info: Some block device drivers support this method of communicating
with a device driver to select special features.  The layout and
contents of the control data varies from device to device.

Notes:   This fn is supported only if bit 14 of the Device Attribute
(the rDevAttr field of the driver's DevHdrRec structure) is
set.  Use Fn 4400H to check this bit.

See Also: Fn 44H (IOCTL)
Fn 4403H (Send Control Data to Character Device)
Fn 4404H (Receive Control Data from Block Device)
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DOS Fn 4405H: IOCTL Send Control Data to Block Device