Microsoft KB Archive/254563

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Description of the Windows 2000 System File Checker Tool


The information in this article applies to:

  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server


This article describes the System File Checker (Sfc.exe) tool, which is used with the Windows File Protection (WFP) feature.


The System File Checker tool gives an administrator the ability to scan all protected files to verify their versions. The System File Checker tool also checks and repopulates the %Systemroot%\System32\Dllcache folder. If the Dllcache folder becomes damaged or unusable, you can use the "sfc /scanonce" (without quotation marks) or "sfc /scanboot" (without quotation marks) command to repair its contents.

System File Checker Tool Syntax

Sfc [/Scanonce] [/Scanboot] [/Cancel] [/Quiet]

  • Sfc.exe - Scans all protected system files and replaces incorrect versions with correct Microsoft versions.
  • /Scanonce - Scans all protected system files once.
  • /Scanboot - Scans all protected system files every time you start your computer.
  • /Cancel - Cancels all pending scans of protected system files.
  • /Quiet - Replaces all incorrect file versions without prompting the user.
  • /Enable - Enables Windows File Protection for normal operation.
  • /Purgecache - Purges the file cache and scans all protected system files immediately.
  • /Cachesize=x - Sets the file cache size.

For additional information about the Windows File Protection feature, please see the following article in the Microsoft Knowledge Base:

Q222193 Description of the Windows 2000 Windows File Protection Feature

Additional query words: compatguidechange wfp sfp switches

Keywords : kbtool kbOSWin2000 KBW2KHOME
Issue type : kbinfo
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000DataServ kbwin2000DataServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch kbWinDataServSearch

Last Reviewed: October 24, 2000
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