LWiggy

i have tried to burn one of my* games to a dual layer cd, i didnt verify it just burnt it, i put it in my xbox and the main screen acknowleges the game is there but when i try and play it, it says the disc is unrecognizable, what am i doing wrong here? i am buring at 2.4x, but i am using a standard laptop disc drive to burn, do you think that will be the problem? thanks all