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. Treemap concept was invented by Prof. Ben Shneiderman, who kindly permitted the use of his concept into this tool.

Changelog:
[+] Added file classes, you can assign colors to file types.
[+] Added drop shadow on selected element for better visual tracking.
[+] Added folder name mask filter, better control on files distribution.
[+] Added logical/disk size, date and nesting level to export tags.
[+] Added create, modify, access directives in file age filter.
[+] Added logical size and disk size directives in file size filter.
[+] Added a fuzzy match algorithm to parse filter directives.
[+] Added DynaSmooth option for best feedback and performance.
[!] Rescan function has been improved in performance.
[!] File modification detection algorithm now is more efficient.
[!] More customizable information is shown in the file tooltip.
[!] Tagging has been extended to folders, for improved flexibility.
[!] Now you can exclude big folders by tagging and filtering them.
[!] The start dialog now supports multiple paths.
[!] Redesigned configuration dialog.
[!] Redesigned Quick Start and User Manual.
[#] Fixed some memory leaks, optimized memory usage.
[#] Minor algorithm and graphical fixes.

Program Information Category: Tools and Utilities Type: Free Version: 1.1.3.0 Size: 1.4MB Works on: Windows Product page: here