Does File Vault only work on Startup Drive?

I've been reading up on FileVault, but I have a Macpro with 4 drives installed, plus some external HDD's as well.
Can FileVault secure them as well, or do I need a separate app? In which case, can anyone throw some recommendations my way?
Thank you!

Hi Andrew,
From what I've found it looks like you can encrypt multiple drives using FileVault 2.  The only drawback is that you would only be able to access the data on these drives using a computer running Mac OS 10.7 or better.  But if you're okay with that it should be just fine.
Here's a MacWorld slideshow that explains how to do this in more detail:
http://www.macworld.com/article/161415/2011/08/lion_encrypt_external_drive.html
Hope that helps!
Micah

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