I see people calling Halo 4 the "first halo game on two discs".
This is false.
There's a campaign disc and a multiplayer disc, it's pretty much the same exact format as another Halo release.
I shouldn't need to elaborate as that should be enough for anyone dumb enough to call halo 4 the first two disc halo.
[Edited on 10.12.2012 5:59 AM PDT]
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You only install the Mp on dics 2. You play everything from dics 1.