Rockstar Made L.A. Noire So Big, They Could Barely Fit It On One Disc

[Ricoswuave38]

I have a question...  If xbox is using close to 25gb because of a lot of copy and past (ex. characters and maybe maps) then why does the blu-ray almost uses up the 25gb if it doesnt copy n paste? sorry I am kinda slow in this stuff.