Understanding DISM Scan: A Guide to Diagnosing and Repairing Windows Issues

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Understanding DISM Scan and Its Importance

As an expert in tech-related issues and troubleshooting, I often encounter users who are looking for ways to repair the health of their Windows operating system. One tool that frequently comes up in these discussions is the Deployment Image Servicing and Management (DISM) scan. It’s a critical resource for anyone looking to resolve system corruption issues and maintain the performance of their PC.

What is DISM?

DISM stands for Deployment Image Servicing and Management. It’s a command-line tool built into Windows that’s used to service and prepare Windows images, including those used for Windows PE, Windows Recovery Environment, and Windows Setup. DISM can also be used to fix the recovery image within an operating system that’s already running.

How DISM Works?

The DISM tool works by mounting and servicing Windows Imaging Format (WIM) files or Virtual Hard Disk (VHD) files. For end-users, the most common use is to scan and repair issues within their current operating system. DISM has multiple options, but the most relevant ones are `/CheckHealth`, `/ScanHealth`, and `/RestoreHealth`.

Explanation of Commands:

– `/CheckHealth` will quickly check to see if there are any corruptions marked in the system.
– `/ScanHealth` does a more in-depth check to find any corruption.
– `/RestoreHealth` attempts to fix any found corruptions. It can either use Windows Update online to retrieve clean versions of corrupted files or a local repair source with known good copies of files.

When to Use DISM?

Use DISM when:

– SFC (System File Checker) is unable to fix corrupted files.
– Experiencing system stability issues or blue screen errors.
– Preparing a system image for deployment and need to integrate updates, drivers, or applications.

Step-by-Step Guide to Running a DISM Scan

To run a DISM scan, you will need an administrator Command Prompt:

  1. Press the Windows key + X and select “Command Prompt (Admin)” or “Windows PowerShell (Admin)”.
  2. Type `DISM.exe /Online /Cleanup-image /Scanhealth` and press Enter.
  3. After it completes, type `DISM.exe /Online /Cleanup-image /Checkhealth` to check if any corruption has been detected.
  4. If the above commands report corruption, type `DISM.exe /Online /Cleanup-image /Restorehealth` to repair the image.
  5. Once completed, run `sfc /scannow` to repair any remaining issues.

FAQ Section

Can DISM operate without the Internet?

Yes, DISM can use a local repair source, but the `/RestoreHealth` command may require Internet access if it needs to download files from Windows Update.

How long does a DISM scan take?

The time can vary significantly. `/CheckHealth` might only take a few minutes, whereas `/ScanHealth` and `/RestoreHealth` can take anywhere from 10 minutes to several hours depending on the level of corruption and system performance.

What to do if DISM fails to repair corruptions?

If DISM can’t repair corrupt files, you might need to perform a Windows 10 repair upgrade or a clean install.


Using DISM to scan and repair Windows images is an essential part of maintaining system health. While it can be technical, understanding how to perform a DISM scan is useful for troubleshooting a range of Windows issues. As someone who regularly uses these tools to troubleshoot tech problems, I can attest to the fact that they are invaluable for keeping your system running smoothly.

Remember, while some command-line tools might seem intimidating, they often provide the most straightforward and powerful solutions to the problems you might encounter with your Windows system.


No sources were referenced in the creation of this article as the information is based on my own expertise and knowledge in the field.