	mov dx,80h + TARGETDRIVE    ; read MBR of target drive
	mov cx,1h                   ; it's always the first sector
	mov bx, buffer       ; point to our buffer
	mov ax, 0201h               ; read one sector
	int 13h
	mov cx,4h                   ; read up to four entries
	mov si, buffer + 1BEh; scan our partition table
	mov si,begin
	mov ax, 4C00h                   ; Exit to DOS.
	int 21h
