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Defrag won't show an "ERROR" unless it cannot complete because Scandisk needs to run.
Defrag just rearranges all of the data on your disc so it is contiguous. That means it doesn't have to seek all over the disc to read the data and can read all the data faster because it's all lumped together with no gaps or other files breaking up the order of the sectors of data.
Depending on how fragmented your drive originally was, you may see a considerably performance increase from getting DEFRAG done (be sure to run it every couple of weeks, or at least once a month).
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