When trying to back up to a WD My Passport I get a message that says the back up disk is not available.  Any ideas?

When trying to back up to a WD My Passport I get a message that says the back up disk is not available.  Any ideas?

Find and run the Disk Utility program. In the list on the left side of the program window you should see two hard drives - the internal Mac drive and one labeled with Western Digital's name. (Not exactly sure how the WD drives appear.) Under each of those drives there will be another indented drive name. See picture below.
If you don't see two drives there's your problem - for some reason the Mac doesn't recognize that there's an external drive plugged in. Check cables, etc.
More than likely though you will see the two drives. See how in the picture I've selected the indented drive icon? Do the same for your WD drive. Now look at the bottom where it says Format. To use TimeMachine your format needs to be Mac OS Extended (journaled) and I'm betting it doesn't. After you've done that TM will be able to use the drive.

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