I got a samsung drive and usig Memorex brand of dvd+r's. When i but the disk in the xbox it says unknown. Has anyone else had this prolem? I know i made a good iso and burnt it well, becasue when i burn games on a cd they work on my xbox. Can anyone tell me if it's just the memorex brand that dosn't work on a samsung drive or if it's the dvd+r's?