Usb not working with mac

I am reposting this question because I have not received an answer. Can anyone help me????
I have a Macbook pro & all of a sudden it's not reading a usb that was working earlier. I get a message "the disk you inserted was not readable..." I'm new to Mac & dont have much tech knowledge, so simple terms would be appreciated. Thank you.

The drive you inserted has failed or was corrupted in some way that OS X can not read it. That error message seems farly clear to me. Drives can fail in a snap of your fingers.

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