I am wondering if there is something wrong with the hard drive. I use iStat Pro. The hard drive display: Use: 77Gb Free:51Gb. While i click finder and at the bottom it said 55.3 Gb available and if i click on the hard drive and hit space bar it said: total: 159.7Gb, 55.56Gb free. Why is there different reading for the hard drive????? PS: How do i view infor about the files???? Like if i use window, i click a like 5 files and click properties. It show me the total amount of GB for the 5 files. How do i do this on mac?