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Step one: click on spotlight and type in "disk utility"
Step two: Click on new image
Step three: name your "disk" and choose 128 bit encription
Step four: put in your password
Violá, your done
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Violá, your done
An easier way: go to http://www.apple.com/downloads/macosx/networking_security/espionage.html to download "espionage" and lock folders easily.
minkster