CHKDSK (pronounced check disk) is a command that displays a status report for a volume, such as a disk, and can correct any errors found in that volume. To use CHKDSK, computers must have the Autochk.exe file already on their system.
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Admins have options for what switches to run with CHKDSK. For example, using /f tells CHKDSK to fix any errors it finds. Using /r tells CHKDSK to look for and recover any readable information in a disk's bad sectors.