Lion won't mount Time Machine backup, but...

My Time Machine back up to an external drive seemed to have failed. It won't mount on Lion long enough to fix the problem. Other times it just locks up.
I dual boot with Vista and it sees the drive and all the files just fine. Any idea of what I can do to mount it on Lion. I'm tempted to just format it in Vista. Mount it in Lion, if it does at all, then format again for OS X. See if just a corrup files and not a failing hard drive.
Any suggestions are appreciated.

Robert Pena wrote:
My Time Machine back up to an external drive seemed to have failed. It won't mount on Lion long enough to fix the problem. Other times it just locks up.
Sounds like a problem with the drive itself, but might be corrupted data.  See if you can Repair it, per #A5 in Time Machine - Troubleshooting.
I'm tempted to just format it in Vista. Mount it in Lion, if it does at all, then format again for OS X. See if just a corrup files and not a failing hard drive.
If you do that, format it again with Disk Utility.  Among other things, be sure it has the GUID partiion map scheme, not MBR (the Windoze setup), or even a version of GUID set by Windoze.

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