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From: Kyryll A Mirnenko <mirya@ukrpost.net>
To: freebsd-questions@freebsd.org
Date: Sat, 13 Mar 2004 01:11:24 +0200
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Subject: Why does `df` lie about free space
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  That's an old problem, but yesterday I was working with 1.4G UFS2-slice 
reported by `df` to have 400kb of free space. Alternative calculations (e.g. 
writing a random file until kernel says no inode's free) give a result of 
more that 100M (!) unused. Thats about 7% of the whole size!
  So whats wrong with `df`?