Time Machine backup stopped and now external HD cannot be mounted

While I was doing a backup on Time Machine, it cancelled itself and said there was a problem with backing up my Macbook Pro. Now, when I go to Finder, I see that my external hard drive isn't mounted. I checked Finder preferences and I already have the option checked to view external hard drives in Finder
I can view the external hard drive in Disk Utility, and I even tried mounting it from there, but it doesn't. I tried verifying and repairing, and Disk Utility says the external hard drive cannot be verified or repaired.
My external hard drive is a WD 1TB My Book Essentials.

chrisasu28 wrote:
I can view the external hard drive in Disk Utility, and I even tried mounting it from there, but it doesn't. I tried verifying and repairing, and Disk Utility says the external hard drive cannot be verified or repaired.
There's a chance a 3rd-party disk repair app, such as DiskWarrior, can fix it, but they're expensive (DW is about $100 US), and there's no guarantee.
You might be able to reformat it, with Disk Utility, and keep using it.  Time Machine will have to start fresh, of course. 
Or contact WD.  The drive may be dead or dying. 

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    If the volume you're copying was encrypted by Time Machine, you may have to unlock it first. Click the Unlock button in the toolbar of the Disk Utility window.
    Turn Time Machine back ON and select the new volume as a backup destination. You can also continue to use the old volume, if you wish. The two will be alternated when both are available.
    CAUTION: If the volume you're copying is corrupt, as shown by Repair Disk or Verify Disk in Disk Utility, then that corruption will be copied to the new drive. Don't copy data from a corrupt volume on a malfunctioning drive. Put the drive aside and don't use it until you're sure you'll no longer need the data. Then securely erase it and take it to a recycling center. Do the same if the Restore operation fails with "disk errors."

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