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You are here: Home / Operating System / Windows Deployment Services / [FIXED] Dism Error: 0xc1420117

Oct 22, 2016 By Jared Heinrichs Leave a Comment

[FIXED] Dism Error: 0xc1420117

I was getting the error message “Error: 0xc1420117” when I tried unmounting a wim file.

To give you a little background about my machine…

It’s is a Windows 2012R2 server with WDS, MDT installed. I installed MDT I needed to install Microsoft ADT which also includes Dism.

If you open a command and run dism the program just runs.

After a little bit of fooling around, I noticed the system had TONS of dism files on it. To resolve the issue you need to run the most up-to-date version. A way to check which dism files are on your computer is to open a command prompt and type:

  • dir C:\dism.exe /s /a

The output will look similar. Notice how the file in the C:\deploymentShare\Servicing\x64 has the most recent file where as the Windows\System32 dism file was made back in 2014.

dism-001

Using the most recent version of dism I then ran the commands:

  • dism /Cleanup-Mountpoints
  • dism /unmount-wim /mountdir:C:\dismmount /discard

NOTE – My mount drive is “C:\Dismount”

Hopefully, this will help you successfully fix your Dism Error: 0xc1420117

Filed Under: Windows Deployment Services

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