Question about hard drive space used

If I run OmniDiskSweeper to sweep my 15" G4 laptop hard drive, the total file size calculated is 31.3 GB. Likewise, if I clone the hard drive to an external drive using SuperDuper!, the total size used on the external drive is 31.3 GB.
However, if I "Get Info" on the laptop hard drive, the Used size listed is 41.9 GB. Likewise, 41.6 GB is listed as "used" in the OmniDiskSweeper Drive List window, as well as in another utility. I suspect that the 41.6 value is picked up from the Finder.
What could be the reason that Get Info lists the space used on the hard drive as 10 GB larger than the total size of the files?
1.5 GHZ PowerPC G4 Mac OS X (10.4.9)
Dual 2 GHz G5 Mac OS X (10.4.4)

Hmm, I think I have a possible answer. I had to download OmniDiskSweeper and open the help from its Help menu to get this answer.
It says in the help for OmniDiskSweeper:
"OmniDiskSweeper only displays files that you have access to from the user account you are logged into. Files in restricted folders are not available and their sizes are not included in the total file sizes you see."
So, if you have other user accounts, then those files won't necessarily be readable and hence not counted in OmniDiskSweeper. There may also be a few system files and folders that might be unreadable and hence not counted. That should be fine since you probably shouldn't be randomly deleting system files.
I've also noticed that OmniDiskSweeper shows slight variations of total sizes in its different windows, so it's not too precise. That probably comes from the dynamic nature of hard drive use by the computer, and OmniDiskSweeper trying not to use too many cpu cycles updating incessantly. Just guessing on that part though.
The 10GB is most likely other user accounts or something else not readable from your own account. The Finder lets you know of course, but OmniDiskSweeper only presents to you what you have permission to access. That doesn't necessarily mean you'll also have permission to delete those things.

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