I just got a set of PS2 swap discs, and they work great for my import games. But then i wanted to try playing some burned games. I tried an nrg copy of Xenogears i had on my hard disk, and it didn't work. I checked the swap disc site and it said it was because they arn't set up to play PSX games. However, in the swap disc set i got a swap disc for CD and one for DVD. Doesn't the PS2 only use DVDs? What else is the CD swap disc for?