Looking at the recent dashboard and UI video, I noticed when he plugs in the SSD the available space goes from 248mb to 1tb. So either the available space readout doesn't show decimals of TB or the memory sticks don't give a genuine 1tb extra space and only 750mb. Is that the same on current gen when you have over a TB of space?
248 + 920 (max space on SSD cart) = 1168 MB or 1.14TB but there were extra games installed on the cart which then appeared in the Game Library as they weren't there initially. I think Fusion Frenzy was one of them.
That's the best thing I saw in that video, that you just plug the cart in, the library updates automatically and you're good to go.