Just pulled a 2TB WD Black WD2003FZEX from a Windows 7 (yeah I know) system. Drive is just out of warranty (of course).

Tried it in a USB drive toaster on my Linux machine. There was a momentary seeking/clatter sound, followed by smooth running. I can't see any partitions. Tried to peek at the MBR with dd, then a few minutes at ddrescue, forward and reverse. Every sector returns an I/O error, 0% recovered. That's as much as I'm willing to try without some guidance.

What is the best course of action?