Hi, folks: Diskeeper pro v.10 and 11 do arm with this alleged remarkable feature-silent background defrag, now O&O defrag Pro jumped on the same wagon, claiming theirs are so super that users can sit back and relax. I just wonder, Are this feature really advantageous to our daily pc work? Some time ago, I read some guru suggested not use this feature in shadow(frozen) mode of any virtulization app. And why is that reason behind? I have this feature of DK enabled, and seems to me it works just fine. Is O&O's in much difference than DK's ? or just another "me too". But O&O's news release calims theirs is one of its kind--to this effect. Anybody can echo that ?