I'm thinking the Hitachi reads the discs a lot faster than the Samsung, and I believe DVD-R/DVD+R media usually takes a little longer to load than standard DVDs, so the drive expects the SS too soon, which is why the HDD/AV trick works, since the drive gets to read the SS before it gives up. My other reason for thinking this is because if you get your backup to load via either method (HDD/AV), play the game, then go back to the dashboard, if you choose "Play Game" again, it will load immediately and play just fine again. It must be something within the drive itself as to how you go about booting games sometimes, but that doesn't really explain why only certain burners are working properly.