This was prompted by a little scare I had while running a defrag operation a while ago. I had cleverly (?) decided to do this in the midst of a thunderstorm, and about halfway through (the defrag, not the thunderstorm) there was a glitch that was big enough to momentarily dim the lights in the room and cause one of my displays to turn itself off. Nasty. Fortunately the computer itself soldiered on and no loss of data was incurred. But if that glitch had been just a bit longer ...



