DISM is a more underlying repair tool than SFC when Windows system is unstable or files are corrupted. 1. When SFC reports corruption and cannot be repaired, system update failed, patch installation errors, boot abnormalities, or system files are lost, DISM should be used; 2. The basic operation is to run three commands in turn: check health status, scan integrity, and repair images; 3. Advanced usage can specify local WIM files as the repair source, and the image needs to be mounted in advance; 4. Notes include ensuring network connection, administrator rights, and long-term operation without interruption. If the default repair fails, try restarting or using installation media to enter the recovery environment.

If you find that the Windows system is running unstable, or the system files are corrupted, causing some functions to not be used properly, the DISM (Deployment Imaging Service and Management) command is a very practical repair tool. It is more underlying than SFC and can fix system image problems that SFC cannot handle.

1. When should I use DISM?

DISM is mainly used to fix problems in Windows images such as system reserved partitions or primary operating system partitions. Common scenarios include:

• SFC scan report is damaged but cannot be repaired
• System update failed, patch installation error
• Unable to boot, system files are lost

When you encounter these problems, running DISM can try to fix the underlying system image to provide a clean foundation for subsequent SFC use.

2. Basic commands and operation steps

Using DISM does not require complicated preparation, only an administrator's permission command prompt is required to operate. The following are several commonly used command combinations:

Start the administrator command prompt:

1. Press Win S to search for "cmd"
2. Right-click "Command Prompt" in the results and select "Run as Administrator"

Commonly used DISM command flow:

 # Step 1: Check the health status of the system image DISM /Online /Cleanup-Image /CheckHealth

# Step 2: Scan the system image integrity DISM /Online /Cleanup-Image /ScanHealth

# Step 3: Try to repair the system image DISM /Online /Cleanup-Image /RestoreHealth

These three commands are usually executed in order. The third is the most critical repair step. It may require network downloading of repair data, so please make sure the network is normal.

If you have run SFC before and prompt "cannot be fixed", it is recommended to run DISM first and then try SFC again.

3. Advanced usage: Specify source file repair

If the default method cannot be fixed, you can manually provide a healthy Windows image as the repair source. For example, you can mount a Windows installation ISO or use a local mirror.

Repair with local WIM files:

 DISM /Online /Cleanup-Image /RestoreHealth /Source:C:\test\mount\windows /LimitAccess

Here /Source parameter specifies a mounted system image path. You need to mount the image using the following command in advance:

 DISM /Mount-Wim /WimFile:C:\sources\install.wim /Index:1 /MountDir:C:\test\mount\windows

This method is suitable for advanced users and is very useful especially in offline environments.

4. Frequently Asked Questions and Precautions

• Long run time : The repair process of DISM may take several minutes or even longer, without interruption during this period.
• Network connection requirements : The repair files will be downloaded from the Microsoft server in default mode, so you must be connected to the Internet.
• Administrator permissions are required : these operations cannot be performed by the normal command line.
• What to do if the repair failed :
  • Try restarting and running again
  • Using local image source
  • Finally, consider using the installation media to enter the recovery environment to run DISM

Basically that's it. DISM is a powerful but not complex tool. Mastering basic commands can deal with most system image-level problems. As long as you remember to check your health status first, then scan and repair it, and use it with SFC if necessary, most system file problems can be solved.

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