After doing a search I wasn't able to find a way to use truecrypt to encrypt the entire volume. The only place I could find anything about truecrypt mentioned was in this blog post. I really have no clue how to implement this but I hope someone has some clue how it could be accomplished.
have a look here http://mybookworld.wikidot.com/encrypted-filesystem
is it that what your are looking for?
MBWE II (blue rings), 2x 1TB WD10EARS in Raid 1 mode
Hacks: SSH, optware, spindown
Applications: dokuwiki, nightly backup script