I have a lot of movies and TV series on iTunes (over 1TB), and PS Vita Content Manager, and I still may want to run bootcamp to play a few games, so I chose 3TB FUsion Drive. Now I wonder if I should have gone with 512SSD + External HDD. I know 3TB is a lot, but 512 isn't. I don't really know how FD works entirely. I mean, if I use 2/3 of 512GB to store iTunes files, bootcamp and PS Vita Content Manager, I'll be wasting my money on space, right? Now people say that FD is smart enough to store my 1TB of iTunes content in the HDD, right? So 128GB of active data would be on SSD? Even if I have 1TB of movies and games, fusion drive is still going to keep OS X, Photoshop, and my most played videogame on the SSD, right? I ask that because I hate Externa HDD, and some say Fusion Drive works alongside the HDD to move and optimize data. I can still change my order, though I'd have to go with external HDD and maybe sacrifice the relationship FD has with both SSD and HDD. Please help me telling me if what I said is true and what I don't know.. An of course if I am losing much by sticking with FD 3TB over 512GB SSD.