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, Final Fantasy XIII is confirmed to have an optional 18.3GB XBox 360 HDD installation for those curious.
To quote: "Just in case you've been planning to get Final Fantasy XIII on the 360, here's some info that will help you with playing the game on the console - the size of each discs' optional install.
The three of them sum up into 18.3GB, as you can see. I'd say the option of installing your games is one of the finest features the 360 offers, cutting load times and reducing disc scratches to a zero, since the DVD drive doesn't spin at all if the game is installed... and now that you know how much space each disc takes up, manage your HDD space accordingly."