Disk Usage Analyzer is a graphical application to analyse disk usage. Disk Usage Analyzer can easily scan your computer and provide you an interactive graphical report of directories and disk usage.
How it works?
Disk Usage Analyzer scans your computer, once the scan is complete Disk Usage Analyzer provides a graphical representation of each selected folder.

Why would you want a disk usage analyzer?
1. If you plan on cleaning up your files and delete unwanted files, you can always start by looking into directories with large disk space usage.
2. Ever wondering what taking up to much disk space on your computer, using disk analyzer can help you find the culprit.
source: https://wiki.gnome.org/action/show/Apps/DiskUsageAnalyzer
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