Comment 14 for bug 1131858

I did some research and this is a duplicate of: https://bugs.launchpad.net/bugs/1001579

Also it's not a nautilus problem, it's the kernel and how it transfers files.

You can mount the drive you want to write to with the -o sync option and that will write all data directly to the drive, so that the file reporting is accurate, though it is slower and can cause premature ageing in solid state devices.

Still affecting: 3.13.0-33-generic (Ubuntu 14.04)