Compusec and Open Source Question.

I'm thinking about using full disk encryption. I've heard of the top
two, one from Jettico called BestCrypt and one from Secure Star called
DC and DCCP. And now there is another completely free tool from a
company called CE and the software Compusec.

Where can I get some technical informatoin on the reliability of these
three? Also, I would rather use open source code if there is one out
there. I've heard Jettico is open source in some degree, but I am not
sure.

Any information you have would be appreciated.

Thanks

lipps