Western Digital MyBook Studio no longer works after Yosemite update
A little while ago (Jan 30) I updated Yosemite, and now my Western Digital My Book Studio (using firewire) shows up but no longer works - no Time Machine, or Super Duper back-ups. Does anyone know why this has happened, and what can be done to fix it?
MacBook Pro, OS X Yosemite (10.10.2)