One for Campaign, one for multiplayer. Problem solved. It worked for Halo 4 and even for ODST. Or is having multiple discs considered passe now that Xbox upgraded to Blu-ray this gen? I'm wary of these kind of mandatory updates needed to play significant chunks of the game. What happens if my XBO croaks 15 years from now and the XBO's servers aren't running anymore? Even ignoring this issues, a mandatory 20GB day-one update sucks for people with slow internet and especially those with low bandwidth caps.