Windows Automated Installation Kit Error: 0xc1420117 on dism Command

Error: 0xc1420117

The directory could not be completely unmounted. This is usually due to applications that still have files opened within the mount directory. Close these files and unmount again to complete the unmount process.

This error happens when you use another Dism.exe which is located in C:\Windows\System32. The correct application to use is C:\Program Files\Windows AIK\Tools\amd64\Servicing\Dism.exe, so you need to direct your command line tool to that location before you run the unmount-command (use cd C:\Path to change directory). Replace amd64 in the path with your architecture or leave it out to go in the Servicing folder inside Tools.

3 thoughts on “Windows Automated Installation Kit Error: 0xc1420117 on dism Command”

  1. I received this error while working on Windows 10. The new location is C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\Deployment Tools\amd64\DISM.

  2. Thanks a lot for pointing that out. I used the WSIM imgmgr.exe and thrown same error.

    I had a pinned icon in my taskbar and the ADK Installer replaced the one in start menu, but it didn’t removed the old one in my taskbar. I didn’t noticed that ADK was installed side by side with 8.1 version and I was using the 8.1 version of ADK using my taskbar icon instead of the one in Start Screen when I was trying to open and catalog my Win10 install.wim and threw that error.

    Again thanks !

  3. Actually, you’re likely to find it’s because Windows Explorer is open, this was my problem, the local version of dism.exe worked fine once I closed it, and the AIK version also failed with it open.

    I think the mounting triggers some process in Explorer where it tries to put the volume in the tree, or explore what it is inside it.


Leave a Comment