How to creating a secure flash drive

I would like to encrypt a flash drive; or preferably a folder within the flash drive.  Please advise about the proceedure.
Thank you.

Setting up an encrypted disk image is a no brainer. I don't know how much these hardened flash drives cost. It may be they are no more expensive than the usual suspects, but I would imagine they cost more and being restricted to these will limit choice.
http://support.apple.com/kb/HT1578

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