Microsoft Dism reference: Repairs a Windows image in a WIM or VHD file. The syntax and selected example below are adapted from the pinned Windows Server 2025 reference. Module availability, target configuration and delegated permissions determine whether it can run in your environment. Documentation and parameter text: Microsoft, CC BY 4.0; formatting adapted by Cmdlet World. No execution testing is claimed.
Use an account with the target resource permissions documented for Repair-WindowsImage. Modifying administrative cmdlets may require elevation or delegated administration. This catalog does not assert that ordinary users can execute the command.
Supported environments
Windows / Dism · Windows Server 2025 documentation; feature/module prerequisites apply
Parameters
-CheckHealth
Checks whether the image has been flagged as corrupted by a failed process and whether the corruption can be repaired.
-Defer
Defers cleanup operations until the next automatic maintenance.
-LimitAccess
Prevents DISM from contacting Windows Update (WU) when searching for the source files to repair an online image. *LimitAccess* can only be used when servicing images that are running at least Windows 8, Windows Server 2012, or Windows Preinstallation Environment (Windows PE) 4.0.
-LogLevel
Specifies the maximum output level shown in the logs. The default log level is 3. The accepted values are as follows: - 1 = Errors only - 2 = Errors and warnings - 3 = Errors, warnings, and information - 4 = All of the information listed previously, plus debug output
-LogPath
Specifies the full path and file name to log to. If not set, the default is %WINDIR%\Logs\Dism\dism.log. In Windows PE, the default directory is the RAMDISK scratch space which can be as low as 32 MB. The log file will automatically be archived. The archived log file will be saved with .bak appended to the file name and a new log file will be generated. Each time the log file is archived the .bak file will be overwritten. When using a network share that is not joined to a domain, use the net use command together with domain credentials to set access permissions before you set the log path for the DISM log.
-NoRestart
Suppresses reboot. If a reboot is not required, this command does nothing. This option will keep the application from prompting for a restart or keep it from restarting automatically.
-Online (required)
Specifies that the action is to be taken on the operating system that is currently running on the local computer.
-Path (required)
Specifies the full path to the root directory of the offline Windows image that you will service. If the directory named Windows is not a subdirectory of the root directory, *WindowsDirectory* must be specified.
-ResetBase
Resets the base of superseded components to further reduce the component store size.
-RestoreHealth
Scans the image for component store corruption, and then performs repair operations automatically. This operation will take several minutes.
-ScanHealth
Scans the image for component store corruption. This operation will take several minutes.
-ScratchDirectory
Specifies a temporary directory that will be used when extracting files for use during servicing. The directory must exist locally. If not specified, the \Windows\%Temp% directory will be used, with a subdirectory name of a randomly generated hexadecimal value for each run of DISM. Items in the scratch directory are deleted after each operation. You should not use a network share location as a scratch directory to expand a package (.cab or .msu file) for installation. The directory used for extracting files for temporary usage during servicing should be a local directory.
-Source
Specifies the location of the files that are required to repair an image. You can specify the Windows directory of a mounted image or a running Windows installation that is shared on the network. If you specify multiple *Source* arguments, the files are gathered from the first location where they are found and the rest of the locations are ignored. Separate source locations with a comma. If you do not specify a *Source*, the default location set by Group Policy is used. Windows Update (WU) is also used for online images. *Source* can only be used when servicing images that are running at least Windows 8 or Windows Server 2012.
-StartComponentCleanup
Cleans up superseded components to reduce the size of the component store.
-SystemDrive
Specifies the path to the location of the BootMgr files. This is necessary only when the BootMgr files are located on a partition other than the one that you are running the command from. Use -SystemDrive to service an installed Windows image from a Windows PE environment.
-WindowsDirectory
Specifies the path to the Windows directory relative to the image path. This cannot be the full path to the Windows directory; it should be a relative path. If not specified, the default is the Windows directory in the root of the offline image directory.
Prerequisites
Windows with the Dism module and the Windows feature or management tools that provide it. Confirm target connectivity and version compatibility using the linked Microsoft reference.
Security considerations
This cmdlet changes system state. Review every target and parameter in the official reference, test outside production, and prepare an appropriate backup or rollback. Do not execute the example automatically.
This command scans the specified image for component store corruption. Source: Microsoft, CC BY 4.0; transcript prompt/output removed. This example was not executed.