What can I do when my USB and External Hard-Drive don't show up on the desktop?

I've plugged my USB into my computer after a fortnight and it gives me a message to do a custom scan. I don't know how to do that. Help?
I've followed some threats telling to "verify" and "repair" on the Disk Utility, and the first time I went through it, it said that it couldn't be repaired but before I could do anything else, my USB disappeared from the list on the left of the window. I tried again but this time and every other time I try, it disappears straight after I verify it. What's going on? What can I do? Please Help?
This has happened before to an External Hard-Drive but I didn't ask for help then.

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