I have a 4gb usb stick and a 4gb xbox, can i combine the two. And also i dontu nderstand why so much is required to install disc 2 if when your on the disc one and you click on wargames it tells you to install dic two OR get it form the marketplace which is free, and it says it only takes up 1.95gb, so is it still the same thing? It says it is im confused please help