Today i wanted to play black ops and it worked just as usually but when i'm in a game online or in combat training it just stops and say's something as: The downloadable context or something has changed. And it stops working and gets me to the main menu. It makes a rare sound also since i can't play only black ops. Other games on my xbox i can play. When i checked the disc i saw a big round scratch trough my cd that. The scratch was tottally round! I heard more things about the xbox that it can scratch your games so i think i'm maybe gonna buy ps3 or i want atleast my black ops back without paying the full price aigan for it.