In actuality, it’s easy to differentiate between the two based on their appearance. The inside of USB 3.0 Connectors is colored blue, the exterior of USB 2.0 Connectors is either black or white. So, it is possible to tell whether the USB connection has been upgraded to 2.0 or 3.0 by the hue that is displayed on the USB port on the computer as well as a USB flash drives.