Xbox One has non-replaceable hard drive, external storage is supported

[forest-spirit]

ethomaz said:

I'm reading on GAF that Major Nelson said that the external storage won't be available at launch.

"The Xbox One will ship with a 500GB hard drive, all of them have that. The future plan is definitely to support external storage, much like we do on the Xbox 360.

My understanding is that feature won't be there at launch because the team's working on other things. It's definitely on the list, but I don't know when it'll come in though." 

http://majornelson.com/cast/2013/09/01/pax-podcast-2013/

No initial support for external storage sounds a bit weird but I can understand why it's not high priority. With 500GB of internal storage it will take some time before more storage is needed.