No mapped drives no, if it was that simple I’d of solved it by now.
Is there anyway of logging what’s going on with smbd so I can narrow down what’s calling it? There’s nothing on that PC I can think of that would wake up the NAS as often as it is doing. I’ve done the lmcompatability registry hack as per http://community.wd.com/t5/My-Book-Live/My-book-live-never-sleeps/td-p/199912/page/17 and set a static IP, but that’s made no difference, killed all the background apps that might be looking at the drive and still its waking up the NAS shortly after it sleeps.
