Have you ever seen the "dism /online /cleanup-image /restorehealth" command and wondered what it does? This command is an important tool in your Windows troubleshooting toolbelt and it's worth getting to know. Here's what this vital command does and how you can use it.
The DISM (Deployment Image Servicing and Management) /online /cleanup-image /restorehealth command is a Windows built-in tool that can be used to repair corruption in the image of an online installation of Windows. It works by scanning for files, folders, and registry entries associated with the installation in question and then restoring any damaged items or replacing any missing items from source files or from Windows Update or from local replacements (if available). It also includes a system file checker utility which can detect and repair problematic system files that can cause system crashes or other serious issues. The rest of the command (the "/restorehealth" part) is a feature that was included since Windows 8 which automatically repairs Windows corruption on demand.
Using the DISM command line is easy once you understand its parameters. Simply type "DISM /online/cleanup-image/restorehealth" in an elevated Command Prompt window to begin scanning for problems related to your OS image. The scan will take several minutes to complete, after which a report will appear with any issues found along with instructions on how to address them. Fixing corrupted files usually involves replacing them with working versions which may be downloaded through Windows Update or through local sources such as a corporate server. In some cases, further instructions may be given depending on the nature of the problem—such as running SFC (System File Check) scans—to ensure that all corrupted components are properly replaced or repaired.
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