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.
On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !
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