WD External HD Will Not Mount

I installed Lion when it was first released and have had no issues. Suddenly now my WD 1TB external hard drive will not mount. I can see it in Disk Utility. I can run "verify disk, it reports that there are no problems. I run repair disk for grins, it reports no problems. The only issue is that it will not mount. I have not installed any updates or software lately so I don’t think there is any conflict there.

I have seen folks reporting issues with WD external drives after installing Lion, but this drive has been working with Lion until a few days ago. Has anyone else see or figured out this issue?

Model is wd10000h1cs-00

That’s a very old drive, I’m amazed it worked at all… Have you tried moving interfaces (From USB to Firewire to eSATA) or trying another Mac to see if it is a drive problem? What if you make another fresh partition on Disk Utility?