Blu-Rays may not be big enough for Square-Enix

[zarx]

torok said:

Indeed. But GoW doesn't have CGI (except for some parts, but all arte short). MGS 4 doesn't have it too and I'm pretty sure that Uncharted doesn't have too (or at least have only a few). All that GBs are pure game size...

GoW 3 has a 2.5h HD making of doco on the disc 

as for Uncharted 3 

"There are some "luxuries" in that allocation - 3.24GB of behind-the-scenes movies, 7GB of foreign language audio, and 10GB of 3D movies (pre-rendered cut-scenes are stored both in 2D and 3D versions) but by our reckoning there's at least 16GB of core game data being used in this game"

from digital foundry

 

Also the Blu-Ray drive has long seek times which means devs use a lot of data duplication to minimise load times as well, the technique is used on 360 as well but less so as disc space is at a premium on that side and seek times are slightly better.