[ubuntu] Disk usage analyzer says 344GB used but report only lists 10GB

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http://ubuntuforums.org – Title says most of my problem. I was recently running into warnings saying I was low on disk space. After running the disk usage analyzer I removed some old backups and cleared out some extra space. However it is reporting that my 488GB hard drive is using 344GB but the detailed report only lists the '/' directory as having 10GB used. So my question is where is the other 350+GB being used? I have attached an image of the report as well. (Hardware)