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Tripple A devs making their games not take up your entire hard drive challenge (100% impossible)
IIRC, part of the problem with some of the other CoD games was using lots of uncompressed audio and textures. It improves performance, but eats stupid amounts of space. Modern console hardware means that there's little reason not to compress stuff now, though. Decompressing audio on the fly has been incredibly easy for a long time, and dedicated hardware on current consoles just to decompress textures means that their impact on performance is also negligible.
Not to mention the fact that even with uncompressed textures, some games (at least on PC, I don't own a console) still run like shit because they have not been optimized properly.