I've always burned the "Bear" design CDR-King dual layer dvd successfully with my iBook G4 + Samsung external DVD writer. But when I tried writing on these from my late 2007 MacBook, I always have errors and a lot of wasted DVDs. Sadly, these are the only ones they stock. Where can I find compatible DVD_DL media for my Mac? Oh, it writes fine on cd-r/rw, dvd-r/rw discs. Even cheap ones from CDR-King.