*chuckles*

Its called HFS+ Journaled (or something like that) , and it does not ger fragmented

You can repair permissions by simply going to Terminal and typing

sudo diskutil repairpermissions /

and It will do the rest for you. I've got few other scripts as well to clear kextcache and stuff like that

Oh one more thing , don't use iDefrag..It might 'mess' your Mac up. Never (from my past experience)