Hello, I'm new here but I need to zero out my hardrive. I am just wondering which icon to click. I boot up using the disk and everything, I get that part. But when I go to disk utility it shows the hard drive icon. One icon has 74.5 GB Fujitsu... next to it and under that there is an icon with "harddrive" next to it. I can zero both out so which one should I do? I realize they are pretty much the same and the lower one is a subvolume of the Fujitsu but will it mess something up if I zero out the fujitsu? Whats the difference between zeroing out one verses the other?