Chosen Solution
Run the serial number throug Western Digital RMA. https://support.wdc.com/warranty/warrant… You can get a replacement so that you can transfer your data off to a replacement drive before sending back the broken drive.
I have the exact same drive in from a customer with exactly the same issue. I have ordered in an identical drive so I can change the board on it to try to retrieve the data. Will report my results the first of next week.
At this point I would stop using it (powered off) until you can figure out what to do. You might be able to save the drive by using a drive recovery app Data Rescue 5The other is to send it out to a recovery service if the drive is physically damaged (head crash).
