Just got an email from O&O saying that this software is available free. Already running their defrag 10 professional, and it works really well so hoping this will be just as good! Enjoy!
"O&O DiskStat is a high-power tool for analyzing the used disk space on your storage volumes. With an easy-to-use interface based on the design of the Windows Explorer, you can take a closer look at the file and folder structure of your internal and external drives. Through intuitive and beautiful graphical representations you will find out which files, file types and folders are taking up the most space."
You receive a license key by email after you sign up.