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ChkdskA utility program in Windows that looks for lost clusters on the hard disk. Originating with DOS, Chkdsk also reports the current amount of free memory and disk space. Running Chkdsk with the /f (fix) parameter reclaims the lost clusters and turns them into .CHK files, which can be examined and generally discarded. Running without the /f reports the current condition of the disk without fixing anything. Following are the primary command line options. See lost cluster and ScanDisk.
chkdsk check disk chkdsk /f check disk and fix dir *.chk list lost clusters