Corresponding to the USB 3.0, it is vertical, horizontal support both external hard disk. If used in USB 3.0, you can significantly reduce the copy time of shortening and video content of backup work time. Besides, I can be downloaded very useful app group the "IO.APPs" free for use on a personal computer. USB3.0 when connecting "blue", lights up in the "green" at the time of USB2.0 connection, I can check the connection status at a glance.