Ok I am running Lion on a macbook. my HDD had 50 free GBs. I did a zero out of the empty space, for no reason, using Cclean then i did it using the disk utility. Any way, after doing it with Ccleaner i lost 3 GBs. my Get Info shows 47GBs. I thought I would do it again using disk utility it might fix it. Is this normal or what? My computer still functions as always , I didn't notice any difference or lost files.