[twapi] has the '''get_volume_info'''[http://twapi.magicsplat.com/disk.html#get_volume_info] for this.

WinXP and following build in '''fsutil''', with which it is possible to retrieve such results as '''fsutil volume diskfree c:''', parse those results, ...

For Unix, of course, ...

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See also [du] and [How can I calculate how much disk space is being used in a directory].

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