FilePro is a free software for windows and it allows you to graphically view the distribution of hard disk space among files.
Main features:
Generate disk treemaps for local or network volumes
Search and locate files in treemaps by automatic zoom-in and positioning.
Save entire or partial volume snapshots
Compare snapshot against current disk state or past snapshots
Examine changes by difference in size or percentage difference
Copy/Move/Rename/Delete files or directories
Directory analysis
Compare files and/or directories
Find duplicate files
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