you might try doing a site search for UFS and see all the difficulties people have encountered with it. we once had a thread about whether os x was fast enough. after arguing for nearly 100 posts or more, it was finally revealed that the person who was moaning the loudest was running on UFS. after a reformat, he saw what we were talking about and the thread ended. don't let the Unix part of os x fool you. this is still a mac os and wil work best with a mac filesystem. go with HFS+. if you really want to have UFS, don't make it anything more than a partition for your 'nix stuff.