How to Encrypt USB on Mac?

Can you please tell me how to encrypt a USB? I ultumately want to encrypt my sd chip for my android, but thought that I should test it out on a USB first.

on a empty usb stick - once connected to your Macbook - open disk utility.
select your usb - then select which format encryption you want.  do realize however, doing it this way, your usb will only work on any macbooks running lion or mountian lion.
if that's not what you want - then download a file encryption software that is compatible to what you want to use it for.

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