So your xbox has to be modded before i can do that? Or can i attach a external drive to my xbox ( i have a connected 500GB external usb drive on it now) as backup for the games i dont play atm i have a Xbox with a 250Gb harddisk so to save space i move stuff around I can move rocksmith to exteral can i then use it on my pc to copy ther files and then "move" rocksmith back to xbox ???? thanx in advance