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O&O Defrag Professional Edition is a software which puts a replacement for the standard Windows defragmenter, that offers a much advanced set of features. It puts fragmented files together and maximizes your PC speed and offers five different defragmentation strategies, as well as OneButtonDefrag technique for automatic adjustment of the settings best fitting for your PC. The program can defragment drives manually, or fully automatically in the background, keeping your system at peak level performance by avoiding build-up of file fragmentation.