My external hard drive will not go up and I'm not sure what the question is

My external hard drive will show up in disk utility, but not of viewfinder. I tried to hit "repair disk" and he says it will take 4 hours, but after a while, that he's finally going to say that it is impossible to repair the disk and I need to make a backup.

Help?

Almost always, the question is quite simple: the hard drive is faulty or has failed. So I hope that you have a backup of everything that is on, it is absolutely essential.

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    < re-titled by host >

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