Hyper-V: Issue when starting virtual machine from downloaded ISO file

posted in: Blog, Hyper-V | 11

Half a year ago I wrote a blog post about issues when mounting an ISO downloaded from TechNet. This error is related and its the error you will get in Hyper-V when starting the virtual machine from the a mounted ISO:

“Synthetic SCSI Controller (Instance ID xxx): Failed to Power on with Error ‘The version does not support this version of the file format’.

Hyper-V Error ISO

The solution to this problem is to make a copy of the ISO file and then mount the copy instead.

If you want to learn how to create a Hyper-V VM from an ISO using Powershell, read this blog post on the Altaro website by Jefferey Hicks.

11 Responses

  1. easiest solution ever!

  2. I have encountered with the same issue and resolved it with by following this article.

  3. I have to lol but yes as simple as it looks this was the solution to this issue that I was dealing with for the last 45 minutes.


  4. alschneiter

    wow, never seen a solution like that! Thanks!

  5. Richard

    Incredible that it is so simple. Thank you.

  6. error messages that make no sense and the simple solutions 🙂

  7. Thank you, after spending 1 hour looking for a workaround, this is the best answer!!

  8. Thank you – no idea WHY this works, but I guess that doesn’t matter.

  9. Robbie

    Whow, incredibly stupid fix!
    I love stupid fixes 😀

  10. ligwill

    Increible … vaya solucion … jajajajajaja … funciono!!!

  11. Valentijn de Pagter

    Hello folks,

    The issue is that the file is created as a sparse file, and Hyper-V does not like that. An easy solution is copying the file, but that takes some time. There’s another way:

    Unblock the file if it’s blocked (right-click file, Properties, click ‘Unblock’ followed by OK/Apply).

    Run these commands in an administrative command prompt:

    set file=D:\path\to\yourfile.iso
    attrib -R “%file%”
    fsutil sparse queryflag “%file%”
    fsutil sparse setflag “%file%” 0

    Afterwards, the VM should boot from the ISO successfully. Good luck and enjoy! Please let us know if this helped!


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