there i am playing black op's, everything is working fine, the normal single player, the on-line multiplayer, then i turn it off for the day. the next day it tells me that i have to update the game or be signed out of xbox live, so i do, then after the update it says it cant recognise the disc. what's going on here? am i suppossed to go buy a new disc, at least when the NES couldnt read the game all you had to do was blow on the cartiridge. Ive just bought medal of honour (abit late i know)-guess what, have to update game, now it doesnt recognise disc?! but if you delete all game info from system settings and cache info then disconnect from internet-hey presto! the game works fine. but i guess i'm not allowed to play online! what gives????????