How do I switch my WD My Book Studio Edition Metal 3TB off?

In the info for this drive on the apple website it states the drive turns itself on and off with your mac yet when I shut my mac pro down the front power light stays on and flashes, does the drive not completely turn off or is this normal? Sorry for the dumb question but besides from pulling the power lead out I’m not sure if the drive is truly switched off!

You need to install Smartware and setup the sleep timer. Check the link below for the steps.