Senior Pilot:
This may be what you're seeing, perhaps?
Help Please
Quote: "I agree with the recommendations to have quite a bit of free space on the boot drive. 10 times the memory seems about right for a working minimum. Recently I've had several clients with only 1 or 2 GB free on the boot disk; they came to me because their Macs had drastically slowed down and they were concerned about a couple of files that could no longer be opened at all. In all cases, their iTunes & iPhoto libraries were enormous, and after we moved them to an external drive and deleted them from the boot drive every thing returned to normal (so far). The one client who had only 725 MB free had to be booted from an external disk so that the trimmimg actions could be accomplished in "real time.""