Free space on hard drive--incorrect reading?

I have a Powerbook G4 with a 100GB hard drive. For almost a year, I've had about 60GB used and about 40GB free. All of a sudden, My free space dropped to 12.4GB.
It seemed odd, so I decided to add up the folder sizes using right click, Get Info on all visible folders on my hard drive. According to my calculations, I should only be using about 30GB. This made no sense, so I'm thinking there are some hidden folders I wasn't adding up.
Next, I downloaded Whatsize, which calculated my total usage at around 27GB. Even stranger but it did corroborate my rough estimate.
I'm trying to determine why the bottom of my Finder windows say that I only have 12.4GB free when I should have a lot more than that.
I emptied that trash!
One more thing. I recently bought a Maxtor networked storage device and I backed up my entire hard drive onto it. I also bought a second iPod Nano.
Can anyone tell me what is going on?
Thanks

More like 5 GB free; you can improve matters somewhat by using the Installer's advanced options to install only the language(s) you actually use. Keep in mind that after updating, you still want to keep several GB free space on the HD to permit creation of the temporary disc files used in CD and DVD burning.
Also, check out Gulliver - Tiger Upgrade Guide

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    From: Luca Gioppo <[email protected]>
    To: [email protected] <[email protected]>
    Date: Friday, March 19, 1999 9:13 AM
    Subject: Oggetto: Re: Knowing the free space on a drive
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