SpaceSniffer is a free, portable application that gives you an idea of 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 situated on your devices. The Treemap concept was invented and used with permission by Prof. Ben Shneiderman.SpaceSniffer Features: Fast and easy to use Supports drag and drop Export module lets you produce customizable textual reports Intuitive structure layout, multiple views for different media Zoomable elements, navigate like a web browser The Windows folders and file popup menu is accessible by right mouse click It's possible to restrict the view content by typing simple yet powerful filtering criteria Lets you temporary tag files with four different colors and perform filtering on them Different views of the same media can show differently filtered elements Customizable in geometry, colors, behaviors You can navigate even during the scan Smart cached scanning engine, multiple views, single scan You can refine a zoomed area by a secondary scan process, even with main scan active Reacts to file system events, keeps always in synch, warns you by blinking elements Can scan NTFS Alternate Data Streams It doesn't clutter your registry, only a plain XML configuration file It's portable, no installation required, just put the executable somewhere and let's go It's freeWare (donations are welcome)