I have a PowerBook G4 15 inch 1.5 GHz PPC processor. Recently My hard drive began it fill up. One night I had 5 GB of free space. The next morning I had 500 MB of free space. No one had used the computer and it was not connected to the internet. Then, that morning, every second the space would decrease by 50 MB. Eventually it said that there was no free space left. I ran Norton Anti-Virus and nothing showed up. I shut down the computer and rebooted it and then it read that there was 700 MB of free space. Now after deleting stuff, there is 2.68 GB of free space.
My hard drive capacity is 74.41 GB. It says that 71.72 GB are used, but after looking at all the folders they only add up to approximately 55 GB. What can I do?
It's possible that a log file is growing because of an error that keeps recurring. You can use MacPilot to look at and empty your system's logs. See if there are recurring messages that indicate some application or program is continuing to have a problem and correct what you can. Any logs that are more than a few MBytes are suspicious. System Logs are rotated periodically by OS X so they should not become very large unless something is amiss.
You can find MacPilot at VersionTracker.com.
You can also find WhatSize and GrandPerspective at VersionTracker.com. They can help find which files on your system are taking up large amounts of space.