How Do I Erase a Password Protected USB Thumb Drive

I have a SanDisk Cruzer 16GB Thumb Drive that I Password Protected.
I have forgotten the PASSWORD and I made the hint to hard also. How do I just erase the Whole Thumb Drive and start over?
I have tried using Disk Utility but the Thumb Drive is all "greyed out"
Thanks for any help.

If you can connect the drive to a computer running Windows or a version of OS X older than 10.7, erase the drive that way. Otherwise see the link below.
Hard disk bricked after using file vault with time machine

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