Flash drive / impossible to erase the content

On my laptop 10.9 Maverick I tried in vain to clear the contents of a Verbatim flash drive, 32 GB.  When I arrive by ticking the delete, it remains grey.  When you try to view the content, Apple said "unrecognized format".  I'd use again, but how can - I?  I would appreciate help in clear terms as I am not a very technical person interested.   Thank you.  Barbara.

Try the tab "partition".

Tags: Mac OS & System Software

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