It's actually a variation on the click of death, so the drive is completely inaccessible (i.e. won't even spin up and allow it to be accessed/recognized at all).
I did manage, using the freezer trick, to reaccess it once. But it went back to clicking so fast and so many sectors were read as bad I couldn't pull anything off. After a refreeze, it seems to be completely screwed and wouldn't restart so I could clear it.
Luckily, WD is letting me do a 'Secure Information' RMA. So, I scan the drive, write a letter of what's on it, and send that in and the RMA goes through. Hopefully. They did ask for a letter on company letterhead. :/