I had and still have this" Private" floder in main stem of hard drive and threw it into trash and all **** broke loose. I could not start up my macbook after and had to reinstall and use time machine to get it working again. The thing is,I don't understand how such a folder that is not even a system folder can do so much harm. Now since recovering through time machine,I have it back again. Could anyone out there enlighten me on this issue. thanks a lot.