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

[mutantclown]

Kane1389 said:

mutantclown said:
The Xbone requires ALL physical games to be installed in the HDD. Add to that all patches, DLC, demos and media people usually keep and 500 GB is not a large amount at all. Say the average next-gen game is 25GB in size, that's about 17 games you could have installed at any given time and that's not including DLC and all the other stuff.

Thats only if you go digital. A disc game thats 25GB big won't take 25GB to install 

Full installation REQUIRED. Mandatory for Xbone. They're going to be bigger this gen. Prepare for MANDATORY 25GB installations on average for Xbone.