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I need an app that tells about file & folder sizes, like what is the biggest file and/or folder on my hard disk, sort this detail from biggest file and/or folder to the smallest & vice versa, also able to tell me about this detail based on the folder that I have chosen.

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migrated from Aug 28 '10 at 1:16

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I've had good luck with the free jDiskReport – BasementJack Sep 6 '10 at 19:36

you can easily do this at the command line by executing the following at the root (/),

du -sk * | sort -nr

For directories only you can execute:

du -sk */ 
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how do I do this for folder only or files only ? – NSanjay Aug 28 '10 at 0:33

You could try Disk Inventory X.

Disk Inventory X is a disk usage utility for Mac OS X 10.3 (and later). It shows the sizes of files and folders in a special graphical way called "treemaps". If you've ever wondered where all your disk space has gone, Disk Inventory X will help you to answer this question.

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+1, great suggestion! I use the equivalent software on Windows for exactly this purpose. I updated your link to go to the manufacturer's website directly, rather than to the 3rd party review site, as that'll be more helpful to people viewing your answer :) – nhinkle Aug 28 '10 at 1:43
I appreciate it! – Ryan Aug 28 '10 at 4:59

I recommend DaisyDisk. Files and folders are visualized by a ring chart, makes it easy to identify which file/folder takes the most space in the hard disk.

The trial version has no limit on time, just a nagging screen when you launch the app.

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You might be interested in GrandPerspective.

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There is also OmniDiskSweeper.

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There are two GUI applications for Mac that help visually identify what's taking up disk space: Disk Inventory X and GrandPerspective. If you've ever used KDirStat or WinDirStat then you should be comfortable with it, but even if not it's fairly self-explanatory when you run it.

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You can also search by file size in Finder.

search by file size in Finder

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