Free Disk Space App uses advanced visualization algorithms which hide details and allow you to zoom in on space wasters quickly.

After launching the App in the left sidebar you can see at a glance all the mounted drives in your Mac. For each drive it shows a pie chart with the white slice showing the free space and the dark slice showing the used space. Under the chart it prints the name of the drive, the free space available in gigabytes (GB), and total drive capacity in gigabytes (GB) or terabytes (TB).

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To collect information on disk usage you need to scan disk first. To do it click on the drive button on the left sidebar. If you do it for the first time you will be presented with open file dialog window which points to your Mac drive - just click the open button. This is necessary as the application is run in a "sandbox" by operating system and you have to explicitly allow it to access you hard drive.

You can track the scan operation by watching progress bar above drives' pie chart. Usually it takes from 1 to 5 minutes. The speed depends on number of files to scan and the files' locations. Network drives and large hard drives take the longest, SSDs take the least.

Understanding The Drive Map

After you click on drive button and scan starts you will see on the right side a tree map of all the files and folders scanned so far.

The tree map follows the structure of the file system, but it shows each file and folder as a box with an area proportional to its size. The visualization algorithm also hides small files and folders leaving only comparatively large files and folders visible, so you don't have to spend your attention on unimportant details.

Finding and Removing Wasted Space

The easies way to free space is to locate large files and folders you no longer need.

Drill down on large folders in tree map by clicking on large boxes in the tree map view.