I'm a former device technician. You can go ahead and replace the internal if you want. The Xbone doesn't really benefit from using a SSD (you can Google this if you're interested) so you can save yourself the dosh there. I've seen this thing in BestBuy and the idea seems really jeuvinille to me. Those extra USB ports are still routed through that one; hence they share the bus and will be 3* slower/less powerful than just using that one. Hello bottleneck. The Xbone already has such a huge footprint and strapping on another chunk of plastic seems silly to me, but to each their own. Horribly composed pic related. 3TB internal 2.5" inside of an external adapter. You could tape the cord to the xbox if it bothered you, I guess. Works flawlessly. I can hide it behind the console if I wanted to as well. Cost me $12 CAD because I recently upgraded my computer to all SSDs and had the pleasure 3TB spare. I did read that you don't want an external. The swap is easy to do, so why not? :D P.S.: The Xbox will format the drive itself, after asking you if you want to use it for the system.