Another Choice for Disk Information Software is Windirstat. WindirStat is another free, open-source application that will display your drive usage on a map that tells you what file types and folders are using the most space on your drive.
The free, open-source utility WinDirStat displays your disk usage in a color-coded map that shows what file types and folders take up the most space on your hard drive. If you don't like Java apps, then WinDirStat will be your favorite.
Read more on WinDirStat at their site
For the Linux Users, there is an excellent program called Firelight. This application displays data as hierarchical pie charts. Filelight displays files and folders as you hover your mouse over it showing information like # of files, size and percentage of the entire file size. You can mouse-click on the pie to zooms in and display a portion of the entire pie. For Linux only, firelight is fast and easy to use.
Finally we have EasyDuplicateFinder that will scan your hard drive for identical duplicates by analyzing file size and attributes (regardless of filename) and notify you of any possible duplicates. I found this app via DownloadSquad. Read more and download the freeware app EasyDuplicateFinder HERE
Now you can make the most of your hard drive space by choosing one of these apps, taking inventory of your hard drives and cleaning out the stuff you don't need.