This clever little device has been the best Hard Drive system I've ever owned. It accepts two G-Drives of any kind (1TB, 2TB, 512gbFlash) at a time in its stacked garages. The Dock connects to computer via Thunderbolt, and actually has two thunderbolt connections to utilize. The G-Drives can be inserted and removed super easily, then they can be taken on the go and connected with USB3.0 Cables. A bit expensive, but the speed and ease of use has made it worth while.