SONY DW-D18A PROBLEM, plz help



Hi, i am new to dvd burning all together, and i decided i wanted to get a dual-layer burner the other day. I picked up a sony dw-d18a burner, and i havent really used it much except to install a few programs or burn a few data CD’s. however the d18a was unable to read a dvd-rw that my friend gave me the other day. Does this drive read dvd-rw’s? do i need a firmware upgrade? if so , any recommendations?