I'm a little confused. The black ops 2 game itself is not an On Demand title so you do need the disk in to play it. Are you having an issue with the DLC?
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I just got the game off the Xbox live marketplace For $60
Apologies, I didn't realize it was recently added to the On Demand list. Have you tried clearing your system cache?
I do that on my Xbox right
Yes ProBossBro117, you will need to follow the steps provided by bowski477 to clear the system cache. This is indeed something you do on your xbox.
ok so follow bowskis advice delete game clear cache but before redownloading find a trial game about the same size. download that and then redownload black ops2. sounds strange but its tried an true.