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Windows SFC (System File Checker)

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Windows SFC (System File Checker) Windows SFC (System File Checker) Francisco Jesús García-Uceda Díaz-Albo Introducción En esta práctica aprenderemos sobre la utilidad de Windows llamada SFC (System File Checker). Aprenderemos sobre esta gran utilidad viendo lo que es y como usarla. Al final de la práctica sabremos usar Windows SFC sin ningún incoveniente. Índice ¿Qué es Windows SFC? Uso de SFC en Windows – Práctica Bibliografía ¿Qué es Windows SFC? SFC (System File Checker - Comprobador de archivos de sistema) es una herramienta desarrollada por Microsoft mediante la cual tendremos la oportunidad de examinar en detalle todos los archivos del sistema para detectar cambios o algún tipo de error. SFC analiza los archivos para comprobar sus versiones y si se descubre que algún archivo ha sido sobrescrito se procederá a recuperar la versión correcta de este la cual se ubica en la ruta %Systemroot%\System32\Dllcache y se procede a su reemplazo. Uso de SFC en Windows - Práctica Para poder empezar a usar SFC simplemente abriremos una ventana de consola (CMD/command line). Se nos abrirá el cmd Pulsamos Tecla Windows + R y ponemos cmd. Uso de SFC en Windows - Práctica SFC nos ofrece diversos comandos para llevar a cabo las tareas de análisis y supervisión, los más destacados son: /Scannow Con este comando examinaremos de forma inmediata todos los archivos del sistema protegidos y reemplazaremos las versiones incorrectas por versiones correctas de Microsoft. Para usar este comando se requiere acceso a los archivos de origen de la instalación de Windows 10. /Scanboot Gracias a este comando podremos examinar todos los archivos de sistema protegidos cada vez que se inicia el equipo. Para ello se requiere acceso a los archivos de origen de la instalación de Windows cada vez que se reinicie el equipo. Uso de SFC en Windows - Práctica /verifyonly Examina la integridad de todos los archivos protegidos del sistema, pero no realiza ninguna reparación. /scanfile Permite analizar la integridad de un archivo y ejecutará la reparación si encuentra errores. Hay que tener en cuenta que debe colocarse la ruta de acceso de forma completa en <archivo>. /verifyfile Comprueba la integridad del archivo con la ruta de acceso completa de <archivo>, pero no realiza ninguna reparación. Uso de SFC en Windows - Práctica /offwindir Para la reparación sin conexión, indica la ubicación del directorio de Windows sin conexión. /offbootdir Para la reparación sin conexión, indica la ubicación del directorio de arranque sin conexión. Uso de SFC en Windows - Práctica Usar esta herramienta es muy sencillo, lo podremos ver en los siguientes ejemplos: > sfc /scannow Una vez finalizado puede darnos o no errores, en caso de darnos error y que salte el siguiente mensaje que no consiguió repararlo únicamente tendremos que hacer lo mismo pero entrando en modo seguro. Uso de SFC en Windows - Práctica > sfc /VERIFYFILE=c:\windows\system32\kernel32.dll Uso de SFC en Windows - Práctica > sfc /VERIFYONLY Conclusión Como hemos visto es una herramienta sencilla y útil de usar, la herramienta podemos usarlo en cualquier situación de Windows (Modo Seguro, en su versión Live de recuperación…) y en casi todas sus versiones, tanto antigua como nuevas. Muy útil teniendo en cuenta por ejemplo que Windows no siempre funciona con interfaz gráfica (Windows Nano Server). Una herramienta sencilla que puede ayudar en muchos casos sabiendo un simple comando. Bibliografía Información sobre la herramienta y como usarlo: Solvetic y Microsoft.
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