What's taking up space on OSX?

Using OSX 10.5.8 on a PowerPC G5. The main disk states I only have 1.8GB free, but I've used a few utilities to find out where the space is being taken up and I'm not seeing what's taking up so much space. I've tried Omni Disk Sweeper, Disk Inventory X and another one. I used Cocktail to clear temp files and caches and rebooted. The only things it tells me are that the users folder has 25.3GB taken up, Applicaitons is 8.5GB, library is 7.4GB and System is 3.7GB. That does not add up to 146.9GB. Can someone help? Screenshot enclosed to clarify.

Thanks! Used space with Omni DiskSweeper
pedroelbeeAsked:
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.Connect With a Mentor Commented:
Hi, I normally check this kind of thing using the shell. Start Terminal then run the following:

sudo -s

Enter an Admin password, this gives you root access.

then run

du -sh /*

This will start at the root / and list directory usage in Mb
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Joseph KingCommented:
Try using GrandPerspective. It's free, and like WinDerStat on the Windows side. It will show you graphically where all your space went...
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pedroelbeeAuthor Commented:
Grand Perspective shows the exact same thing as all the other apps :(

So does the terminal. Any other ideas? Can something be hidden? Can it be partitioned differently maybe?
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.Connect With a Mentor Commented:
These are showing hidden files, anything starting with a . on a unix file system is hidden. Would you object to posting the output of the du command ?  Also it might help if you run df in terminal and post this also ...
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Sigurdur ArmannssonDesigner Commented:
Omni DiskSweeper http://www.omnigroup.com/products/omnidisksweeper/ is perfect to find out what and where is taking up space. Free application.
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pedroelbeeAuthor Commented:
Nope, tried DiskSweeper, same result. Will try the du command and post results. Thanks.
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Sigurdur ArmannssonDesigner Commented:
What's bugging me about the picture you uploaded is that DiskSweeper is saying on one hand that your disk is 146GB and on the other hand (the window) that it is 46GB. If it is 46GB, then the amount of the files in the User area make sense.

Can you check in the Finder what the real size is? (Select the disk and get info). Is it 50GB or 150GB.
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.Commented:
That's why is was gunning for the DF and DU output so we can actually see what's what and where using inbuilt unix tools rather than any add ons.
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pedroelbeeAuthor Commented:
In Finder, if I go to the disc and select "get info" it' says Capacity: 148.93GB. Available: 878.4MB. Used: 148.07GB on disk.
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pedroelbeeAuthor Commented:
Ok, I finally ran du -sh/* and got all permissions errors. I ran a permissions repair from disk utility, waited until it was finished and then ran du -sh again. I now get a list of space but it quickly gets followed by more permission denied errors.

I FINALLY figured out the issue: there was a user account on here listed under users that didn't exist in the "user accounts" control panel. I think the disk utilities did not have permissions to look at that folder so they weren't reporting it taking up space.

Thanks to everyone for your help!
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pedroelbeeAuthor Commented:
Thanks!
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