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Why is shutting down the running processes needed for a disk defrag?

April 26, 2017Defrag disk needed Processes running shutting

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Why is shutting down the running processes needed for a disk defrag?

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Running processes like your firewall, anti-virus utility (visible processes) or spool32.exe, pstores.exe (hidden processes) interrupt the defrag process. Thus the defrag will take longer time in best case or completely stop in worst case.