I have 2 fat xbox 360s. i fixed the rrod on both. I would like to mod one of them to use a external usb HDD as a xbox hdd. And if i can, use the same HDD (or other external)as a game iso hdd. I did see a couple cool "chips" that let you use a usb HDD to emulate the dvd drive. But i would love to have an xbox HDD without spending crazy money on a small "xbox 360 HDD" Also, any chips out there that i can use to play backups and use xbox live?