Good backup to disk is not recognized by MacBook Air

I have MacBook Air, a Seagate external hard drive to use as a back up disk - and for external storage.  Apple I crossed the first backup several months ago.  The Seagate worked well. Today when I joined the Seagate, I received a message 'the disk cannot be read by the computer.  What should I do?

OS X Yosemite: If Time Machine can't find your backup disk

Tags: Notebooks

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