Checks disks for disk problems, listing them and optionally repairing them.
Must be run with administrator privileges.
$ chkdsk c: The type of the file system is NTFS. Volume label is Windows. WARNING! /F parameter not specified. Running CHKDSK in read-only mode. Stage 1: Examining basic file system structure ... 1129728 file records processed. File verification completed. 12209 large file records processed. 0 bad file records processed. Stage 2: Examining file name linkage ... 917 reparse records processed. 1528816 index entries processed. Index verification completed. 0 unindexed files scanned. 0 unindexed files recovered to lost and found. 917 reparse records processed. Stage 3: Examining security descriptors ... Security descriptor verification completed. 199545 data files processed. CHKDSK is verifying Usn Journal... 38168520 USN bytes processed. Usn Journal verification completed. Windows has scanned the file system and found no problems. No further action is required. 498799615 KB total disk space. 157366132 KB in 923056 files. 494000 KB in 199546 indexes. 0 KB in bad sectors. 1256051 KB in use by the system. 65536 KB occupied by the log file. 339683432 KB available on disk. 4096 bytes in each allocation unit. 124699903 total allocation units on disk. 84920858 allocation units available on disk.
$ chkdsk /? Checks a disk and displays a status report. CHKDSK [volume[[path]filename]]] [/F] [/V] [/R] [/X] [/I] [/C] [/L[:size]] [/B] [/scan] [/spotfix] volume Specifies the drive letter (followed by a colon), mount point, or volume name. filename FAT/FAT32 only: Specifies the files to check for fragmentation. /F Fixes errors on the disk. /V On FAT/FAT32: Displays the full path and name of every file on the disk. On NTFS: Displays cleanup messages if any. /R Locates bad sectors and recovers readable information (implies /F, when /scan not specified). /L:size NTFS only: Changes the log file size to the specified number of kilobytes. If size is not specified, displays current size. /X Forces the volume to dismount first if necessary. All opened handles to the volume would then be invalid (implies /F). /I NTFS only: Performs a less vigorous check of index entries. /C NTFS only: Skips checking of cycles within the folder structure. /B NTFS only: Re-evaluates bad clusters on the volume (implies /R) /scan NTFS only: Runs an online scan on the volume /forceofflinefix NTFS only: (Must be used with "/scan") Bypass all online repair; all defects found are queued for offline repair (i.e. "chkdsk /spotfix"). /perf NTFS only: (Must be used with "/scan") Uses more system resources to complete a scan as fast as possible. This may have a negative performance impact on other tasks running on the system. /spotfix NTFS only: Runs spot fixing on the volume /sdcleanup NTFS only: Garbage collect unneeded security descriptor data (implies /F). /offlinescanandfix Runs an offline scan and fix on the volume. /freeorphanedchains FAT/FAT32/exFAT only: Frees any orphaned cluster chains instead of recovering their contents. /markclean FAT/FAT32/exFAT only: Marks the volume clean if no corruption was detected, even if /F was not specified. The /I or /C switch reduces the amount of time required to run Chkdsk by skipping certain checks of the volume.
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