Use the adapter to a USB 3.0 hub with Gigabit Ethernet port on the Microsoft Surface Pro 2 to operate. With the adapter it is now possible 2 2.5 "hard drives at the same time on the Hub without the connection is lost.
To achieve this you put the red connector into the USB port on the power supply of the Surface Pro 2 and the blacks in the USB port. Then still the hub off and you run both drives on without complaint :)