My External Hard Drive is All of a Sudden Not Appearing in Finder. How Do I Fix This?

How do I fix this with my LaCie Rugged 500GB external hard drive? I connect to my MacBook Air, via USB 2.0. I have tried other ports and computers, but it still is not recognized by Finder. The USB ports on my computer work, because the drive is recognized in Disk Utility. However, nearly all of the options are unavailable in Disk Utility (see screenshot), and I am unsure as to what I should do.
Any help is much appreciated!
-William

You have tried selecting William's External and then choosing the Mount option in the toolbar?

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