I've tried burning on fujifilms dvd's +R at 2x, 4x, 8x(quite crappy dvds) but the launcher couldn't resolve the game ID so it didn't work.
The only other dvd's I have are TDK+R double layer and it works really fine. It's a shame to burn 4 gigs on 8 gig media, but it's a winning combination.
Key...