Apple "genius" advised I zero it out, which I did on both the Macintosh HD volume as well as the internal HDD. Since then, not one single apple tech rep nor local mac expert nor retail store rep an answer this: why, after zero out, 7 pass, are there still 3 folders and 2 files occupying over 221 MB on my hard drive?? Help!! No one has been able to answer this thus far.