All of the files that I have on my computer (mac book 60Gb) add up to about 30 Gb yet when I "get info" on the Hard Disk it says that I only have about 7 Gb left. Why is this? Are there "hidden" files of previously deleted content sitting somewhere - this is exactly what happened to my USB memory stick. The way I fixed that was to re-format the memory stick and I really don't want to do that to my HD Has anyone seen this before? Thanks.