I have a mb and mbp...both with 500 gig hdds. Both are running 10.6.4 yet I am miffed by the available space. I recently installed a fresh copy of osx on my mbp and have merely been dragging info from the mb to mbp and yet the mbp has less available free space even though I have not transferred everything from the mb to mbp. I have added a few things to the mbp but nothing major (like open office) How is this possible? When looking under my boot drive, there are 4 folders. Here are the respective sizes MB Applications: 10.53GB Library: 8.2GB System: 4.39GB Users: 286.11GB Available free space: 188.67GB Adding up the totals, I get 497.9GB....seems very close to the capacity of 500GB MBP Applications: 7.14GB Library: 5.57GB System: 4.61GB Users: 290.97GB Available Free Space: 183.69GB Adding up the totals, I get 491.98GB....while close to capacity of 500GB, it is alot further from it than the mb Intuitively, the mbp should have more free space but it is a good 5GB less. Why is this? Why is it when I add these totals up, there is such a large discrepancy in relation to the original drive capacity (497.9GB for mb vs 491.98GB for mbp)??