Free Hard Drive Space with GrandPerspective
GrandPerspective is an OS X application that lets you visualize how much space files take up on your hard drive. This lets you quickly find what’s been hogging the most room and causing those scary ‘you are about to run out of space’ warning messages.
GrandPerspective is also helpful for teaching those less familiar with computers about the relative sizes of different kind of files. People like my mother, who will leave a 3Gb movie laying around, but spend hours deleting text files to try and free up space.
(The above photograph is from my own attempts to declutter my current laptop and see if I can squeeze down into 64Gb for the SSD on the new Macbook Air. Sadly, it looks like that won’t be an option.)
[Click here to download GrandPerspective]
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How does this compare to Disk Inventory X?
WinDirStat (http://windirstat.info/) does something very similar and provides a similar visualization for Windows.
This type of program employs treemaps. For windows, see also SpaceMonger (http://en.wikipedia.org/wiki/SpaceMonger)
I love hat tool, because it is so fast!