I have the french version with US one inside. 8 GB.
I tried to copy US version in a new root folder, it does not work, still strating in french !
technical post :
http://eqiiforums.station.sony.com/e...ssage.id=24523
well, I think i'll stay with that for now, as I know (thanks to you all) where to put my UI files, I don't really care, just 4 GB lost.