I did some shopping and I see that the TB2 iMac 2015 may have been lost in the shuffle as afar as connectivity goes. Yes there are USB3 SSD external drives, not sure that would be up to speed. I have beens using FW800 to TB2 and am surprised my next purchase might have to be that same outdated and noisy tech. I just want SSD, but would love to use my TB port since I am using all my USB and hubs are iffy. Shopping was very frustrating, like a twilight zone. Good grief the iMac is just over 2 years old! What do you use?