SpaceSniffer

Is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks. By using a Treemap visualization layout, you have immediate perception of where big folders and files are placed on your devices.

http://www.uderzo.it/main_products/space_sniffer/

WinDirStat

WinDirStat is an open source disk usage statistics viewer and cleanup tool for various versions of Microsoft Windows

http://windirstat.info/

BTW JJ (Hardware/Software guru ) prefers SpaceSniffer

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