Id rather be able to play the campaign and multiplayer all from disc 1 rather than having to constantly swap between them like in Halo ODST
all aspects of the game are run on disc 1. Disc 2 is only an install disc, no switching needed. If all the whiners in this topic were playing on PC, that would have been the first thing you did anyway. So just do it and play the game. Its already been mentioned that it's only 3.5gb so if you cheaped out and got a 4gb, sorry for ya...better get a hdd or a USB stick.