Hard Disk Visualizer - Sequoia Viewer

If you have a hard disk that seems to be forever full, then maybe this free tool can help you. It is a hard disk visualizer that represents the hard disk in visual form, giving a good representation of the size of individual sections of the hard disk, with the capacity utilization by different files and folders represented in graphical form. The bigger the size of the file, the bigger is the space shown in the hard disk.

http://www.win.tue.nl/sequoiaview/ (Called the Sequoia Viewer)



Couple of tips:

1. You can see how sometimes temp folders can be huge

2. If you don't turn off hibernation option in XP, it has an unused file the size of your installed RAM (I never use hibernation, so turing off the option in Control Panel > Power Options > Hibernate > Enable hibernation saved me 1.5GB)

3. Lots of old stuff lying around that never got deleted