External Backup Disk Suddenly Won't Mount...

Tried to shut down, restart and repair the disk with Disk Utility...but it won't mount. Any suggestions? It's a WD 500GB external backup disk...I use it for Time Machine.
Thanks!

The only other thing that I can suggest at this point is to turn Time Machine off and try reseting the partition map scheme +(GUID Partition Table)+ and the format +(Mac OS Extended)+ again to see if it repairs the drive. Unfortunately that will erase all of your previous TM backups, but might get the drive working correctly again. Then if and when you get the drive working correctly go to the Time Machine Preference and reselect the drive to Use for Backup.

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