❗This is an unofficial source, with the binaries being grabbed from the official website, no support will be provided for these binaries.❗
SpaceSniffer is a freeware disk space analyzer for Windows that make use of the Treemap concept to view the current disk usage. Among the most notable features you'll find:
Features
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drag and drop support
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intuitive structure layout (multiple views for different media)
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zoom elements (browser-like navigation)
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powerful filtering (you can filter your results based on size file name age)
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customizable options (geometry, colors, behavior)
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fast scan of your hard drive (navigation worked even when the scan didn't finish)
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support for NTFS Alternate Data Streams and so on.
SpaceSniffer is fully portable on all modern Microsoft Windows versions (doesn't have a setup file. Therefore it doesn't mess up with your current registry - it just adds an XML configuration file). You can use the executable file on other Microsoft Windows OS; there's no need to extract the archive each time.