When looking at a Hard Drive, how do you know exactly how much data is on the drive and how much is free space...? What is a little confusing, is that there are 2 figures telling you 2 different numbers.... As in my attached photo, the top figure says: 99.22 GB of data ! and the bottom figure says in parenthesis : (106,487,257,696 bytes) So which one is accurate ?? Thanks !