everything is uncompressed.
Mass Effect 3 having lots of "compressed like hell" videos and being compressed itself is 14gb. So it is not so hard to believe that an uncompressed game can use 20gb.
UC3 I think is 45gb, because the 3D version of the cutscenes are just vids stored in uncompressed 720p quality in the Bluray. The same goes with KZ3. The PS3 is powerful, but to render that kind of graphics TWICE would make it explode XD.








