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Lightweight non intrusive little gem.
I have an ageing 7year old laptop running Windows 7. I played with background defragmenttion in all the current defragger like O&O, Perfectdisk, Diskeeper and found them to be CPU intensive. MST the other hand works very light and uses only idle CPU cycles. I barely noticed its operation. In fact I doubted whether it was doing anything but it always kept my hard disks 0% defragmented. It doesn't have all the bells and whistles that other apps have, but still love how it runs.
Pros: Very lightweight - runs like a dream on old pcs.
Background defrag is the best in its class
Set and forget about defragmentation forever
Excellent price/performance ration.
Cons: Cannot schedule defrag easily.