Halo 4 may be coming on two discs, but Xbox 360 gamers need not worry about disc-swapping, as it seems the second disc is strictly for installing multiplayer content on the hard drive.
According to Microsoft, the data is a mandatory install which ”contains data that will need to be installed on an Xbox 360 hard drive or compatible flash storage device with at least 8GB of available memory in order to access ‘Halo 4′s’ extensive suite of multiplayer features.”
Currently, Microsoft is dealing with perma-banning pirates with bootlegged copies of Halo 4.