You know my 500GB drive just recently started doing something similar. I connect it, and the blue activity light comes on on the front and it even shows up in Device Manager under Disk drives as WD. It shows as a disk in Disk Management that needs initialized, but when I try to initialize it I get an incorrect function error. Still trying different things but nothing has worked yet. If something works I’ll shout. If anybody else is familiar with this I would love to hear what you did to fix it.