Microsoft’s Albert Penello confirmed that the 500GB hard drive that will ship with the next-gen Xbox will be non-replaceable and non-serviceable.

Penello did mention that the One does take advantage of the super fast USB 3.0 ports and will allow external storage. There was no mention of an external storage limit but according to Penello the system will read all file types as it would off the internal drive including installed game data, media and downloaded software.