Hard disk not readable by this computer

I have 2 identical WD2500JS HDD in my Mac Pro. Both worked fine for sometime, but now I'm greeted with an error message every time at boot up and the 2nd drive isn't usable/mountable/readable at all.
The drive appears in the Disk Utility as "Media" and Disk Warrior can also see the drive, but I'm unable to see any partitions, it's size, repair it, etc..
Disk Utility and Disk Warrior claim S.M.A.R.T is not supported on the drive, not sure if that matters (the other disk correctly supports it).
I'm not sure what I can do to recover the data on the disk or if the disk is permanently damaged.
Thanks for your help.

Sorry to hear. TechTool Pro 5 does an excellent media scan job. And it should be a warning to make backups more often, and more sets, two or more.
TTPro also has pretty good SMART test suite (Intech Speedtools probably has the best), though SMART "ain't" that smart.
I replace drives every two years or so, use the older drives for backups.
First I'd pull them, put them in FW case for SATA drives, and give that a shot. And you'll need disks to recover to, to replace them (even if you repair or are able to zero out or 7-way write - OS X tools are not that hot for mapping out bad sectors).
Disk Jockey is $500 but does full sector copy (no computer needed).

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