How to find where all hard drive capacity has gone?

My hard drive has a capacity for 75GB. Whe I click Get Info - it says I have used 52.9 GB but when I Get Info for all the Directories on the hard drive (Applications, Library, System, Users) it shows 25.1 GB has been used. How can I can I find where the oher stealth 21.8GB are? (note: my PowerPC G5 does not have this problem). Thanks

Eric:
Whatever you do, don't move or remove any hidden files; instead, just look there and do Get Info's as necessary or desired, okay? These are critical files and are hidden to preclude them from being moved, etc. If an errant file is found, there are other ways to remove it if necessary...
With the hidden files/folders option selected in OnyX, do a Get Info on /private/var/vm/ at the root level of your hard drive. This will tell you the size of the virtual memory/swap files, which should be well under 1 GB.
Regarding Backup, have you ever had a backup scheduled without the external drive mounted as the target volume, or perhaps a failed attempt to backup to the external drive? If so, you may have a "false backup" hidden on your startup drive. If you think that this has happened, please advise. This could also occur while using Disk Utility's Restore option, CarbonCopyCloner, SuperDuper, etc.
Gary

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