What are some of the options for upgrading the internal storage on the new Retina iMac? The way I understand things is that the base model comes with a 1TB hard drive and 128GB SSD marketed as a 1TB Fusion Drive. Looking through the teardown at iFixit.com you see a standard spinning drive and a small SSD on a card. So it's probably safe to assume that the 1TB Fusion and 3TB Fusion are configured this way. What if you get a pure flash based storage option? Do you get the same form factor SSD on a card but with 256GB, 512GB or 1TB? Is the spot where the standard drive empty? Will it be cabled where you'd be able to add on to it in those models?