WinXP system explanation: decrypt scf parameters

Everyone knows the basic usage of sfc in Windows XP, but the meaning of the parameters in the command line is different from the introduction in "Help and Support", which affects the user's use to a certain extent. Its meaning.

1. In the general media, when introducing the use of sfc, for example, input sfc /scannow to run sfc (system file check), but in fact, Windows file protection is always enabled, only by default, only It is necessary to use sfc /scannow, sfc /scanonce or sfc /scanboot to repair the contents of the Dllcache directory when the Dllcache folder is corrupted or unusable.

Tip: File Protection

When you install software other than the operating system, you may overwrite some shared system files, such as dynamic link libraries (".dll" files) and After the executable file (".exe" file), etc., the system may not be stable anymore. Since Windows 2000, Microsoft has added file protection function, and Windows file protection function can prevent the protected system file from being replaced. Windows File Protection can detect attempts by other programs to replace or move protected system files. If the file version is incorrect, Windows File Protection replaces the file from the Dllcache folder (also known as the file-protected cache, located in the system32 folder of the system directory) or the Windows 2000/XP installation CD.

2. For the meaning of sfc /revert, for example, if you run sfc /scanboot once, you will automatically run sfc every time you enter Windows XP, in the "System Configuration Utility" You don't see it in Startup. If you want to disable it, you can run sfc /revert to restore it to the default state.

3. sfc /purgecache can clear the "Windows File Protection" file cache, which removes all the contents of the dllcache folder. This is of course possible for users with tight disk, but Windows XP has lost. The ability to restore system files by yourself, so the compromise should be to reduce the size of the folder appropriately, /cachesize=x parameter to set the size of the "Windows File Protection" file cache, the default size is 102M, the minimum value For 15M, you can set it according to the situation, Windows will adjust according to the importance of the file (of course, you can also increase the folder).

The meaning of other parameters is not described here.

4. Disable file protection

If you want to disable file protection, you can enter gpedit.msc in "Start → Run" as follows: "Local Computer Policy → Computer Configuration" In the "Administration Templates → System", find "Windows File Protection", double-click "Windows File Protection Scan" in the right window, enter the "Settings" tab, select "Disabled", you can also set the file protection scan here. Frequency and the location of the specified cache.