So I have the WD 1TB Black HDD. In all I have 931GB of usage. Recently, even with cleaning of it (I use a 119GB SSD primary) I still only have 63.3GB free. Now when I look in it it's puzzling as I've cleared up a lot of games and don't have terribly many things in there. So I did a test. I highlighted everything in my HDD and right clicked properties on it. When I do this it tells me the size is 594GB. This makes much more sense, though now I'm left puzzled as to where the other hidden usage is coming from. Thank you for any who have insight.