INT 48 - Western Digital WD1002-27X SuperBIOS - DRIVE DATA (NOT A VECTOR!)

Note:	the second WD1002-27X controller in a system uses the low byte to
	  store the number of drives controlled by the second controller,
	  and the high word for temporary storage during track recalculation;
	  the first controller uses offsets 74h-77h in the BIOS data area
	  (refer to MEMORY.LST) to store data
SeeAlso: INT 47"SuperBIOS"