Having issues with my SATA Hard Drive, 2011 iMac

Hi all -
I was recently trying to clear out space on my hard drive, as I have externals and I like keeping my hard disk as empty as possible.
I went through and have been deleting, moving, backing up, etc. etc....But I kept noticing a huge discrepency between the Used space on my hard drive, and how much I was actually using.
When I go into "About this Mac" and click on the 'Storage' tab, it shows this for my hard drive:
http://imgur.com/dRTUV7J
First of all, "Other" claiming it's taking up zero KB when in fact it's taking up more than everything else is ridiculous. I understand if OSX needs a few gigs for itself to run; but somewhere over 100gb? Could somebody shed some light on this, please? It would be greatly appreciated.
Oh, and I'm running 10.8.3.
Thanks all!

Hello,
Just asking to be sure... have you emptied the trash?
Have you used Disk Urilty to Repair Disk, not Repair Permissions?
How much free space is on the HD, where has all the space gone?
OmniDiskSweeper is likely the easiest/best, and is now free...
http://www.omnigroup.com/applications/omnidisksweeper/download/
And if needed, you can use Terminal to run it in admin mode to see files/folders your user can't see...
http://www.macobserver.com/tmo/article/how_to_recover_missing_hard_drive_space/

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