Right now, I have 1.6TB, and quite a bit of it is full. I have a lot of games and apps (~300GB), a fairly large amount of music (WMA lossless, around 700-800kbps), TV, and movies (I have no idea how much space it all uses, but it's several hundred gigs), weekly images of my OS/app drive (~500GB), and I'm sure I would use a lot more if I had it.