SFC

System File Checker (SFC) scans and verifies the versions of all protected system files after you restart your computer.

SFC /?

SFC [/CACHESIZE=x] [/PURGECACHE] [/REVERT] [/SCANBOOT] [/SCANNOW] [/SCANONCE]

none.

/? (NTXP)

Displays help.

/CACHESIZE=x (NTXP)

Sets the size, in MB, of the Windows File Protection file cache.

/PURGECACHE (NTXP)

Purges the Windows File Protection file cache and scans all protected system files immediately.

/REVERT (NTXP)

Returns the scan to its default operation.

/SCANBOOT (NTXP)

Scans all protected system files every time the computer is restarted.

/SCANONCE (NTXP)

Scans all protected system files once.

/SCANNOW (NTXP)

Scans all protected system files immediately.

none.

You must be logged on as a member of the Administrators group to run.

If SFC discovers that a protected file has been overwritten, it retrieves the correct version of the file from the %SYSTEMROOT%\system32\dllcache folder and then replaces the incorrect file.

If the %SYSTEMROOT%\system32\dllcache folder becomes corrupt or unusable, use SFC /SCANNOW, SFC /SCANONCE, or SFC /SCANBOOT to repair the contents of the Dllcache directory.

none.

none.

External

DOS

none

Windows

none

Windows NT

NTXP NT2003