Does what it says
My 2TB drive is usually pretty sluggish - still Daisy Disk only takes a couple of minutes for a full scan. I like the visual representation - it quickly allowed me to see where the big space hogs were so I could transfer them to a network drive. As I am getting critically low on free space, this app really is a time-saver and gives you much more information than the built-in storage usage graph.
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DaisyDisk