sony is better than asus,, the only problem in sony is that it reads slowly at the initial stage. after that its all ok. and that is especially in a dvd writer. in cd writer sony is much much better than asus.. asus cd rom is good but in case of cd writer asus is not at all nice.. on later stage asus stops detecting black cds. u have click on refresha nd detect again to check.. then at last it will work.... there has been vote for both asus and sony. but believe me.. i used samsung in 1999,, then changed to LG, LG was nice but now it is not... asus is average(cd rom is grt not cd writer) and then i went for sony, our group is 28 people use sony cd writer and it is the best. IF IT IS A CD WRITER THEN BLINDLY SAY SONY -- THAT OVER AND OUT