I just got a Gateway computer with a comination CDr/rw - DVDrom drive. I bought a small pack of TDK data CDRs to test the drive. I've copied 6 of my CDs, so I could keep them at work. All play fine on my computer drive but when I tried to play them in my cd player I ran into problems. 3 played fine, 1 wouldn't play at all, and 2 would play but had an anoying scratchy sound. What's going on?