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I dont know if im wrong but i herd about a second disk coming with Halo3 odst[Edited on 06.23.2009 11:33 AM PDT]
Rawr Im a dino!
THe second disc has the whole halo 3 multiplayer experienceThe first disc has firefight campign theater on it.
Above poster is correct.And it helps with loading times, in case you're wondering why they're not on the same disc.