It is possible to plug an USB 2.0 device into the USB 3.0 port, and it will function, however it can only operate with the speeds of the USB 2.0 technology. Therefore, if you plug an USB 3.0 USB flash drive to the USB 2.0 port it will only function at the speed that USB 2.0. USB 2.0 port is able to transfer data, and reverse.