1.    31 Jul 2015 #1
    Join Date : Jul 2015
    Posts : 13
    windows 7 /10

    Windows 10 crashed during Upgrade. Unable to detect operating system.

    I'm new here so pardon if there is any mistakes.

    Anyhow I am currently using windows 7 (not a fan of windows 8). Since windows 10 is released I wanted to install and try it.
    Initially I installed windows 8.1 in my D:\ drive (works normally as far as I can tell), and upgrade it to windows 10. I am keeping my windows 7 in drive C: as I do not have any other working computer if the installation failed.

    So halfway upgrading from windows 8.1 to windows 10, the upgrade failed and a restart is needed. When restarting I tried to reset the installation but even that is failed. When restarted again there is no operating system in that drive (drive D: ) ??

    Currently I tried to reformat my drive D: (windows 10) with my current windows 7 (installed in drive C) but it says the volume is in use by another process but it refused.

    Drive C: - windows 7, still functioning properly
    Drive D - where windows 8.1 is located and upgraded to windows 10 but failed, currently cannot detect any os when i boot from drive D: , and cant format the drive.

    I know its really stupid and complicated the way i installed my windows 8.1 with my windows 7 intact, but I'm worried if the installation failed, I have no backup computer to fall back. Is there any suggestions that I can do?
    Last edited by Perseides; 31 Jul 2015 at 10:38. Reason: Readability
      My System SpecsSystem Spec

  2.    31 Jul 2015 #2
    Join Date : Apr 2014
    Space coast of Florida
    Posts : 3,780
    Windows 10 Pro X64 14393.105

    Try booting Windows 7 to Safe Mode (F8) then see if you can format D: from there. Do a quick format, full format is not needed.
      My System SpecsSystem Spec


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