Rob, following is some information for how GParted determines the unused
space in a partition.
For the ext4 file system GParted uses the following command to retrieve
information:
dumpe2fs -h /path-to-partition
Where /path-to-partition is something like /dev/sda3
Then GParted parses the output to find "Free Blocks:" and "Block size:"
to calculate the amount of free space. Please note that free blocks is
not necessarily exactly the same as available free space in the file
system.
The relevant GParted code can be found in the set_used_sectors method at the
following link:
http://git.gnome.org/browse/gparted/tree/src/ext4.cc#n64
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https://bugs.launchpad.net/bugs/670628
Title:
nautilus, gparted, and disk analyzer disagree about free space.
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