My USB pendrive still contains files for installing PC-BSD. I wish to use the pendrive for something else now, but I can't delete the files or format the pendrive using the GUI. There's no way a newbie would know how to format or delete the contents of an external device using the command line - and there's a risk of formatting the wrong device!
See screenshot (I know it's not clear, but it's supposed to show the contents of the USB device; the option to "Move to Wastebasket" is greyed-out).
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