>Why do you say that file system journalized it's not secure?
Secure as in privacy.
>Which is the main difference between the two solutions (freebsd and netbsd)?
http://mail-index.netbsd.org/tech-ke...msg000504.html
or in detail:
http://www.wasabisystems.com/technology/wjfs
and last not least gjournal:
http://www.freebsd.org/doc/en/books/...-gjournal.html
and
http://lists.freebsd.org/pipermail/f...ne/064043.html
If you're interested in the differences between journaling and soft updates,
http://www.usenix.org/publications/l...l/seltzer.html