I was trying to zero my usb from the option Disk Utility but could not happened. Help me out to solve this problem.
closed as off topic by Web-E, Geppettvs D'Constanzo, Thomas W., jokerdino♦, fossfreedom♦ Jul 26 '12 at 20:10
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I think I found what you mean.
You want to delete all information and make sure it is not recoverable.
Here is the source of the answer: http://www.pendrivelinux.com/permanently-remove-information-from-your-usb-drive/
If there are files you need to "hide", I'd recommend
This should help you: