sorry I'm sure this is a stupid question i just can't figure out which of the two answers is the stupidly obvious one. have a 2011 iMac 2011 27", its two problems are lack of SSD and lack of USB 3.0. i don't want to spend a huge amount of cash, i was looking at either a thunderbolt to usb 3.0 adaptor or a thunderbolt external SSD drive. but the kanex adaptor has usb 3.0 plus an 'esata' connector. I'm not really sure what that is. is esata the same as sata? can i attach an internal SSD drive to that? its just that it'd save me using the slower usb 3.0 slot and also blocking up a slot.