Low Stratify

Ok I will, but I have 7.7gb free after downloading War Games and Spartan Ops... So I should have enough space

Ok here is what happened. I have a 20gb HD. I downloaded the first Halo4 Disc which is around 7.5gb, so I had around 5-6gb left. I then downloaded the second disc for multiplayer which it said was 1.5gb for spartan ops and 2.0 for war games. Once I did that, I went on to play multiplayer and it loads some of the maps but not all? I heard that the second disc is 8GB and someone told me it might not have downloaded all the maps for me. I deleted everything and downloaded just the second disc and it still says it's 3.5gb for both the multiplayer things and went back to Halo4 and STILL couldn't load most of the maps. Can someone please help me figure this out? I have a 8GB Flash Drive too so if I can't have both on the HD ill just put the first disc on that.