[XT] [AT]
Expects: AH    11H
DL    drive: 80H-81H=hard disk 0-1
                                                                  
Returns: AH    BIOS disk error code if CF is set to CY
                                                                  
Info: This positions head 0 head of the specified hard drive over
track 0.

Notes:   This is automatically performed by reset fns 00h and 0aH.

- -

INT 13H 11H: Recalibrate Drive