Turned on my MacBook Air (2010, 4gb, 256gb) today and I suddenly have 71GB free space according to Finder. I had 53GB yesterday. The strange thing is that Disk Utility still identifies 53GB of free space today. Disk Utility is happy with the disk. Had to repair some disk permissions, but this didnt change the free space in Finder. Why are Finder and Disk Utility disagreeing and what can I do about it?!