I'm out of space on my 500GB Xbox One. I'm looking at the WD 4TB Mybook but am open to suggestions. Since I filled up 500GB in less than a year I'm thinking I need at least 3TB. There is a 3TB My Passport Ultra at Amazon for roughly the same price as the 4TB Mybook but the 3TB one is USB powered. Does that matter or should I just get the bigger one?