Error 2 during TM backup -- drive can't be repaired. What next?

*Time Machine log:*
Starting standard backup
Backing up to: /Volumes/TM v.3-Leopard/Backups.backupdb
Error: (-50) Creating directory 2010-12-27-180631.inProgress
Failed to make snapshot container.
Backup failed with error: 2
*Attempted repair with Disk Utility:*
Verify and Repair volume “TM v.3-Leopard”
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid node structure (in red text)
Rebuilding Catalog B-tree.
The volume could not be repaired. (in red text)
Error: Filesystem verify or repair failed. (in red text)
*Volume can no longer be mounted.*
The FAQ/Hints said that a "heavy duty" disk repair utility might work.
I have Drive Genius 3. Since the volume can't be mounted, I can't try it.
Any other suggestions?
Thanks
harv47

Does Disk Utility see it at all anymore?
If not, eject and disconnect it power it off for a few moments, then Restart your Mac. Reconnect and see if either Disk Utility or Drive Genius can see it.
Be sure all connections are snug and secure; try different ports, cables, and combinations of the two (a plug that works fine in one port may not make good contact in another).
It does sound like either the data is corrupted beyond repair, and/or the drive is failing or has failed.

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