Make USB flash drive unreadable

I want to make my USB flash drive unreadable, but I don't know how to do it. I can only find threads about problems with unreadable drives, but I don't have a problem, I want to make it unreadable. Is there a way to do it (like OS X can't read NTFS, but I want that with HFS+ for a specific flash drive too).

Actually, Mac OS X can read NTFS.  So I'm not at all sure what you're trying to do.  Are you trying to encrypt a drive, or destroy the data on a drive, or make it so that Windows users can't read it, or make it so that Mac users can't read it, or make it read-only (like NTFS on a Mac)?  Or something else entirely?

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