Hi. I don't own an Xbox 360, but I do have a question regrading the feature where you can install retail games onto the hard drive off a disc. I would like to know how much of the game is actually saved on the console when you do this. A friend who does own a 360 told me only a portion of a game is saved. I would like to confirm whether or not this is true. With the way Xbox words it on their website, this idea sounds false. I would just like a definite yes or no. Thanks.