i have the same mobo and asus has made a fool of us all. It said that it has all usb 2.0 ports but only two ports are usb 2 complient rest are 1.1 so if you connect the thumb in the rear ports they are 1.1 and will get the message the mobo port is the 2.0 one connect a usb headder to it and use it. Also enable full speed in bios.