Different DVD drives

[dman]

I heard that the Xbox was made with 3 different DVD drives. Something like Thompson, Phillips, and Samsung. One of the reasons I bought the Xbox was because I read in reviews that it's DVD player was above the average. If it was made with diff. DVD drives, how do I know if I got the one that is above the average? The reason I ask this is because it kinda acts up on a couple of movies of mine.

Thanks,
-Darin