You can expand the storage on Xbox One by connecting an external hard drive. The Xbox One will format the drive for use with games and apps, and you can use it to store as much as you want. There are a few things to keep in mind, though. First, the drive must be USB 3.0 compatible and have a minimum capacity of 256 GB. Second, you can only have one external hard drive connected to the Xbox One at a time. And finally, the external hard drive must be powered externally; the Xbox One doesn't provide power to external hard drives.