mmmm . . . lateral thought . . . if you are defragging a desktop and there's a power
failure you may trash either your system or some valuable data.
Worth backing up data before a defrag, and I'd vote for keeping the operation as
short as possible, the risk of power loss being directly proprotional to the length
of the operation - if you see what I mean.
So I'd skip the file re-arranging - its a second-order effect anyway.