My stock 4x SuperDrive won't read a just burned DVD-RW disc but the stock combo drive will. I want to re-use them but after just one burn I can use them (burned at 2x TDK). HELP! Also my mom has the exact same MDD config (bought 2 months after mine Dec 2003) and that drive (A506) has the same problem. I am lucky to get 5 uses out of a DVD-RW disc right now. Reading DVD-R's no problem same for pressed discs. It's only DVD-RW discs (only had this TDK pack). Ripping a CD right now in the drive no problem.