My DKS on Xbox (Europe version) has only a 4 MB store on the HDD !
Like Trippy said: probably most of the game plays directly from the disk.
But I always install all my Xbox games on my HDD before I even start playing the game.
Hes talking about the actual game size not the save file?+
Or do'ya mean 4GB.
Once you install it to the Hard Drive, it will play it off their not off the Disc, it only needs the disc to verify you have a Legit Copy.