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O&O Defrag Professional is a superb example of a quality defrags utility, which offers stacks of features and a streamlined interface. The application thoroughly searches every part of your drive to reconstruct scattered file fragments. This, in turn, drastically speeds up old hard drives.. Jun 27, 2020 · O&O Defrag Professional is a replacement for the standard Windows defragmenter, which offers a very advanced set of functions. It brings together fragmented files and maximizes the speed of your system and offers five different defragmentation strategies, as well as OneButtonDefrag technology for automatic configuration adjustment that best suits your system..