I got about 24 MB/s when I copied from my WD 2TB Black internal hard drive to either Seaget Goflex 2TB or WD MyBook 3TB. I am pretty sure the cables that come with the external drives are USB3.0. They have blue color connectors. I have Windows 8 Pro.
This hard drive slows down the boot up times even I did not install the Smartware. When boot up to Windows 8, it automatically opens this drive folder on the desktop. I can’t find a way to disable it. I checked the
startup folder but nothing showing for the WD drive. When I disconnect this hard drive from the computer, everything is back to normal. I think it is the WD SES driver causing the problem. It shows up in Device Manager when the drive is connected but it was at the bottom of the list; not under Disk drives. It disappears when the drive is disconnected. Now I only connect the hard drive when needed. It is very inconvenient to connect and disconnect all the time.