INT 13 - DISK - RESET DISK SYSTEM
        AH = 00h
        DL = drive (if bit 7 is set both hard disks and floppy disks reset)
Return: AH = status (see AH=01h)
        CF clear if successful (returned AH=00h)
        CF set on error
Note:   forces controller to recalibrate drive heads (seek to track 0)
SeeAlso: AH=0Dh,AH=11h,INT 21/AH=0Dh,INT 4E"TI Professional"

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