How does FileVault 2 work for external hard disk?

Hello users, I've activeted FileVault 2 for my computer and it works without slowing down! But now, I really want to try the new feature about FireVault 2, how can I use it for an external hd? I tryed to search from Google more information, without success...please, help me!
Rox

Here is some help:
http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/13
and right here as well:
https://discussions.apple.com/message/15665368#15665368
Note, I've read it's a bad idea to encrypt your drive that has your TM backup on it. Good luck!

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The iMac discussion section does not seem open to me asking this question. It's geared to the Intel Macs or other categories which do not allow for me to type in the following question:
Bottom Line Question:
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James, yes. I put the question in the iMac section and did get some solutions. My LaCie external hard drive is back now. I was aware that the arrow is connected to Eject actions, but was concerned when I went to Finder Preferences and selected the LaCie to show up on the Desktop, and its icon did not show up on the desktop. I hope you and your family are enjoying the weekend, James. But how could you not: You have little Kate there with you. Lorna in Southern California

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All that I can provide is what has worked for me for years.
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AlfaGuido,
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Philly_Phan wrote:
That doesn't answer HOW the database determined the router location to begin with./message-abuse!input.jspa?objectID=28092111&objectType=2
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Drew Reece wrote:
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How does FileVault 2 work for external hard disk?

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