MDT Unable to mount WIM

Andy Guo 1 Reputation point
2022-06-28T19:03:23.997+00:00

Hi everyone,

I've been working on a deployment share for work to mass image new desktops. I am running into this error here and haven't been able to fix it. I supposed it was something to deal with permissions as I can update the share (as a local admin, not on domain) compared to now (logged in as domain user, with local admin rights).

Let me know if there is anything else to try out, I've gone through everything.

=== Making sure the deployment share has the latest x86 tools ===
=== Making sure the deployment share has the latest x64 tools ===

=== Processing LiteTouchPE (x64) boot image ===

Building requested boot image profile.
Determining if any changes have been made in the boot image configuration.
No existing boot image profile found for platform x64 so a new image will be created.
Calculating hashes for requested content.
Changes have been made, boot image will be updated.
Windows PE WIM C:\Windows ADK\Assessment and Deployment Kit\Windows Preinstallation Environment\amd64\en-us\winpe.wim will be used.
Unable to mount the WIM, so the update process cannot continue.

=== Completed processing platform x64 ===

=== Processing complete ===

Microsoft Deployment Toolkit
Microsoft Deployment Toolkit
A collection of Microsoft tools and documentation for automating desktop and server deployment. Previously known as Microsoft Solution Accelerator for Business Desktop Deployment (BDD).
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  1. AllenLiu-MSFT 22,241 Reputation points Microsoft Employee
    2022-06-29T06:56:34.99+00:00

    Hi, @Andy Guo

    Thank you for posting in Microsoft Q&A forum.

    I got the same issue before. The solution for me is re-open MDT by right click Deployment Workbench (MDT) and Run as Administrator.


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  2. Andy Guo 1 Reputation point
    2022-06-29T13:48:41.91+00:00

    Hi @AllenLiu-MSFT

    You are referring to Deployment Workbench in the start menu and right-clicking to run as an admin? If so, I just tried this and still popped the error.

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  3. Andy Guo 1 Reputation point
    2022-06-29T14:15:21.753+00:00

    @AllenLiu-MSFT

    I have an account (clsadmin) and local admin (COMPUTER\Administrator) trying to update the share but they aren't able to. Once my domain admin remotes into the server and creates the share, then he can update it properly.

    Is there anything I can do to resolve it?

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  4. AllenLiu-MSFT 22,241 Reputation points Microsoft Employee
    2022-06-30T09:27:42.257+00:00

    Hi, @Andy Guo

    Yes, we have to use a domain admin to create and use the deployment share, you may check the guidance:
    https://learn.microsoft.com/en-us/windows/deployment/deploy-windows-mdt/create-a-windows-10-reference-image#create-the-mdt-build-lab-deployment-share


    If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".