I just bought the midrange 2.4Ghz/8 Gb Ram Mini with the the 1 Tb SATA (windows laptop was dying and Best Buy had a sale). Like I'd heard, Sierra is slow on the this Hard drive. It seems running the computer on an external SSD seems to be the solution. I can't seem to find all the info I need in my searches. Can I simply clone the internal drive to the external drive, then run the Mini from the SSD and use the internal drive for additional storage? Is a USB 3 drive fast enough for this or does it need to be Thunderbolt? Thanks!