Used space is more than volume size?
If I select right-click > properties for a volume (external hd) in Nautilus, it says that 285GB is used, while the volume size is 279.4GB - and 2.3GB is free.
A df -h says 264G is used. The partition is 300 gig in size, which doesn't really help much given the reduction from having a filesystem, but presumably the df output is most likely to be correct.
Is Nautilus somehow counting the file sizes wrongly when it scans the volume?