First time a hard drive dies on me... But, wait!

[pdq]

I'm not sure I'd be planning on a long-time continued use of a clicking hard drive that didn't mount, even if it is functioning now.

Does it have a S.M.A.R.T status in Disk Utility?

[Onamuji]

Yeah. Clicking is bad.

Run SMART Utility and install the SAT driver to check the status of externals.