I recently got an RGH xbox 360 that came with no harddrive. I am paranoid that I will accidently format the nand and ruin something. 360 came with a USB that supposedly has a nand back up but I have no idea what to do with this in case something bad happened. I bought a 2tb western digital that the xbox 360 recognizes on the M$ dashboard. The drive is popping up as unformatted, but I am scared that this could be the nand since it is not showing how large the drive is. A mod on here has been very kind in helping me, but I don't want to burden him if I can help it. Help would be greatly appreciated.