I tried to back up on my Mac Book Pro 10.7.4 and WD quits. Someone suggested reinstalling but I don’t know how to do that. The first time I started it up it kind of went automatically. Sorry for my ignorance.
Be sure to have the latest Smartware version installed. Check the links below for the steps to uninstall Smartware and download the latest version.
How to uninstall WD SmartWare from Windows (7, Vista, or XP) and Mac OSX (10.4, 10.5, 10.6, and 10.7)