I tried rebooting it, power cycling it, etc. No luck.
I contacted support. So far there has been 6 responses from Tech Support (which of course) started off with:
My apologies; I failed to notice you are using Linux.Western Digital technical support only provides jumper configuration and physical installation support for hard drives used in systems running the Linux/Unix operating systems. For setup questions beyond physical installation of your Western Digital hard drive, please contact the vendor of your Linux/Unix operating system.Which of course is *really* helpful since it is a *Linux* NETWORK drive accessed via web browser and samba. Of course, I understand they aren't trained to understand that a browser or ping on a non-windows system is just as accurate as on a windows system, but...
Still no resolution. I am expecting they are going to tell me to RMA the drive -- but I have a lot of personal sentimental pictures and such on there that have no backups (as these were the backups to the Windows box that died)... No clue what I am going to do -- but since I seem to have to RMA every Western Digital device I buy (internal or external) maybe I should quit buying WD.