Campaign Pack 1: 16.46 GB. Campaign Pack 2: 14.37 GB. Co-op Pack: 2.86 GB.

According to PushSquare, the base download for Call of Duty: Modern Warfare 2 is 151.4 GB, with co-op and multiplayer packs that can add a handful of bonus gigs. Even those that own the game on disc will need to wait for this massive download before they can play.