How do I get half of my hard drive back because half of it is missing and I can't use it?

I still have my iMac from Early 2008 and currently when I checked my hard drive space because I'm downloading a large game to see if I still have space for it. I saw that I have about 159.14GB left of Hard Drive Space and I know that I have a 320GB HD installed in my computer. How do I get the missing half of my hard drive space back?

Or run OmniDisk as root. But don't delete anything while in root. Just look.
Open Terminal and copy/paste and hit return. Give your admin pword when requested, which won't appear as you type it in. Hit return again.
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
And definitely look at Pondini's site for this. Some great tips there.

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