Disk just spins/clicks: WD My Book Essential 2 TB USB 3.0/2.0 HD

WD External Drives External Drives for Mac
2

Hello,

As a recommendation, you can try connecting the drive directly to the wall outlet and the USB cable directly to the back USB ports of the computer.

Also you may want to test the drive on a different computer.

If stills the same after checking those steps, try getting a different power adapter to test the unit.