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#11
XP's defragmenter was a joke so I used Defraggler. However, I nothing but problems when I tried to use it in Win 7; it was ridiculously slow and frequently crashed the computer. I started using Ein 7's native defragger and it works great. It's fast, can be set to run automatically at a specified time daily, weekly, or monthly and I have had no problems with it. I have mine set to run in the wee hours every Wednesday when I'm normally unconscious. My data HDDs stay at 0% and, very rarely, may get up to a whopping 1% I see no reason to use any other defragger.