My 2 TB My Book Essential 1140 will not work with the USB 3 port on my new Windows 8.1 computer. When I plug it in to the USB 3 port the computer registers that something has been plugged in, but not a disk drive. Device Manager has a yellow exclamation point that says “unknown USB device”, and Sy…

My Book 1140 works on USB 2, not USB 3 port

Joe_S January 15, 2015, 4:41am 4

Did you check the manufacturer’s site and motherboard site for updated drivers? Having Windows check doesn’t always get the newest drivers.

Joe