Today I ran the "erase free space" function in Disk Utility. Before I ran it I had about 15GB of free hard drive space. Halfway through the process, an error message popped up saying that the computer was out of hard drive space! I quit disk utility and checked my hard drive. It said "Zero KB Available." However this can't be the case because my computer is running fine. I shut the computer down and started it back up hoping that this would fix the problem but it didn't. I am on a 2GHz MacBook with 1GB of RAM. Does anyone have any suggestions?