Driver?

I plugged in the USB and nothing happens.  The white light is on but the drive doesnt show up.

Check if the drive appears on Computer.

Make sure to try a different USB port.

Try the suggestions on the following article:

WD external drive is not assigned a drive letter by Windows or Mac OSX and data on the drive is inaccessible

http://wdc.custhelp.com/app/answers/detail/a_id/1164