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Unable to make C: Bootable

Ranjithkumar Duraisamy 131 Reputation points
2020-10-08T12:27:12.203+00:00

Hi All, I have been trying to install OS(1903) in Hyper-V VM But it keep failing at Apply Operating System. But the error says as below. ![30888-image.png][1] [1]: /api/attachments/30888-image.png?platform=QnA

Microsoft Configuration Manager Deployment
Microsoft Configuration Manager Deployment
Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Deployment: The process of delivering, assembling, and maintaining a particular version of a software system at a site.
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  1. Simon Ren-MSFT 32,221 Reputation points Microsoft Vendor
    2020-10-09T02:55:27.837+00:00

    Hi,

    Thank you for coming Microsoft MECM Q&A forum.

    ==>"Failed to make volume C:\ bootable. Please ensure that you have set an active partition on the boot disk before installing the operating system."

    When in BIOS mode, you can only install the OS to a BIOS partition scheme. If you want to install the OS as a UEFI scheme, you need to boot to UEFI. This is because the task sequence will only create boot systems that match the current mode.

    Please help check your format and partition task and make sure that you've set the proper partition as active. Copy a default format and partition task from a Wizard generated task sequence if you need to.

    Thanks for your time.

    Best regards,
    Simon

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  2. Ranjithkumar Duraisamy 131 Reputation points
    2020-10-09T03:09:54.247+00:00

    Hi @Simon Ren-MSFT ,

    Thank you so much for your time in help on this. I have created a Native TS from CM Console without using MDT and another one with MDT as well but both leads to same issue. More importantly i didn't make any changes after i created them.

  3. Simon Ren-MSFT 32,221 Reputation points Microsoft Vendor
    2020-10-12T06:54:08.527+00:00

    Hi,

    Thank you very much all your reply and sharing. We're glad that the question is solved now. It may help others who have similar issue. Here's a short summary for the problem.

    Problem/Symptom:
    Failed to install OS(1903) in Hyper-V VM with the error "Unable to make C: Bootable"

    Solution/Reason:
    Change Gen 1 to Gen 2 Drive of Hyper-V VM.

    Best regards,
    Simon

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