Automatic defrag is theroretically excellent; it's just that Microsoft did a lousy job of writing this defragger which doesn't defrag properly. I mean, why would you want to waste time and go through the trouble of running a defrag manually or scheduling one for a period where the PC may or may not be in use. Instead, a properly designed smart automatic defragmenter such as seen on enterprise networks, reduces the workload of IT personnel, yet provides excellent results even on busy servers. No reason why this shouldn't be applicable for home systems either, since desktop computing power is cheap and plentiful these days.