Game requires 13 gb of memory. I own a 4 gb system but bought a 32 gb usb stick. The game will not load and states that it cannot locate an xbox harddrive. I can only assume that it is an internel vs external memory problem. Can anyone verify? I am already out $75 and would prefer not to drop another $100 plus on an external harddrive that may not work. The game only states the amount of space required. If the game only works with an internal harddrive, perhaps Microsoft should state so on the product.