Since installing Mountain Lion I have had some issues with my SSD. Before it was telling me I had 3gb available when I hit GET INFO for the HD from Finder. But when I went into disk utility it would tell me I had 150+ free but if I tried to download a file bigger than 3gb it would tell me I don't have enough free space. I ran a disk inventory and confirmed that these numbers weren't adding up correctly. So I wiped my hard drive and started over with a fresh install of ML. 2 weeks later, similar problem. My Disk Utility is telling me 106gb available (should be more like 160g available) and finder is telling me 187gb available. I tried reindexing my hard drive but that did not help. I've had SSDs since Snow Leopard and I've never had an issue.