Start up disk full - doesn't add up!

Hi,
I'm a first time Mac user and, I am having trouble with a full start up disc. My iMac 1 TB hard disc only has 12 GB unused space. I've seen a number of questions posted, so it seems I'm not the only one experiencing this problem. However I've not seen any answers for the problem I'm experiencing. I've downloaded DaisyDisk hoping it would point me in the right direction as to what files to delete. However this has only confirmed that something unidentifiable is eating away at my disc space (probably something in the "dark slice" seen in the graphic presentation of my hard disc seen below). When checking out the hard disc i can se that 85 GB is space used by Users (of which home video and pictures is about 45 GB), 7 GB Library-directory, 3,2 GB System, 2,5 GB Program, and finally about 2,5 GB Other smaller files. In total approx. 100 GB used space!! What is occupying the 800 GB which cannot be seen? Something not visible is eating away space or is there a problem with OX Lion which I've upgraded to?
Please help! I hope there is a MAC guru somewhere out there who can solve this in laymans terms.
(And please do not tell me there are personal files clogging my computer - there is no way that is creating this problem. As stated above I've checked for this and it only amounts to 100GB. There must be some system log file or cache file, under the radar creating this problem. And yes I have emptied the trash can, web cache as well as disconnected my gmail account from Mail and emptied it)

Pondini,
Thank you for the great help! I downloaded WhatSize (one of the programs referred to in the article you guided me to.). Logged on to every user account and ran this disk utility. Turns out Mail (connected to a gmail account) for one of the users has been creating the problem. A faulty mail has been resending and failed again to infinity and created some sort of backup log which reached more than 800 GB! I'm now back at 100 GB used disc space of 1 TB. (Perhaps DaisyDisk might have done the same thing, but I was getting desperate. WhatSize was worth every penny!)
The air is back, I can breath again.
Once again many thanks!

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