Lost hard disc space

Hi,
I recently just realised that i am running out of hard disc space but i cannot understand why. My disc is 150gb and i have 20gb free. when i select my hard disc and check info it says i have used 92gb, but when i go through and check each individual folder on my disk the total only comes to 24gb (all apps, library, music, video, system, users etc).
How can this be?
Is there a program i can use to visually represent where all my disc space has gone to? I remember when i used a pc there was a program that showed hard disc usage as a pie chart.
thanks very much

+How can this be?+
When you use the Get Info command on a folder, invisible files are not included in the total. But they are included in the Get Info sums for the hard disk.
Disk Inventory X (free) will show the size of those invisible files as well. There is also WhatSize (formerly free, not $13 shareware).
Hope this helps...

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