[ubuntu] Copying large files

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http://ubuntuforums.org – So I had a few large files to copy, about 5GB each. From/to same partition. Start the copy, it says '3 minutes left', so I think....a quick solitare game. And poof...system hangs. Nada. Nothing. I wait about 5 minutes, and nada...mouse is obviously not working. Power down, reboot. And of course the new directory I was copying to doesn't even exist after a reboot. Really? Is there a known problem using nautilus to copy large files? Better way? (Hardware)