Convert GPT Disk to MBR Disk in Windows 10  

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  1.    #10

    urbanman2004 said: View Post
    I then convert the newly duplicated disk to MBR. After doing so I would connect the SSD to another system (BIOS, not UEFI), but that system would give me a booting error.
    You need to do more than convert the GPT drive to MBR to get it to boot under legacy BIOS. You need to have a system partition that is marked as ACTIVE on the drive that contains the boot files specific to legacy BIOS booting.
      My ComputerSystem Spec

  2.    #11

    NavyLCDR said: View Post
    You need to do more than convert the GPT drive to MBR to get it to boot under legacy BIOS. You need to have a system partition that is marked as ACTIVE on the drive that contains the boot files specific to legacy BIOS booting.
    True, which I forgot to mention I had done that step within the app during my first attempt which is what I planned to do on my second attempt as well.
      My ComputerSystem Spec

  3.    #12

    SO I was successfully able to convert my Windows 10 OS from GPT to MBR without data loss... I'm already very familiar w/ how to do it the other way around, done it multiple times (which I consider more difficult).
    Here's what I did:
    01. Using "AOMEI Partition Assistant Pro Edition" on a GPT/UEFI PC -> Migrate to OS -> select prepared "clean" spare disk drive (in USB enclosure), untick 'Make boot structure same as original drive [producing an MBR instead of GPT] (can't remember exactly what it said verbatim)', and apply changes
    02. After following the on-screen prompts, it will automatically restart PC in a Windows Preinstallation Environment (or PreOS Mode) to complete the task.
    03. Manually restart from original disk drive, run "AOMEI Partition Assistant Pro Edition", select duplicated disk drive -> Wipe 'EFI' partition -> Merge [blank] partition (with OS partition), and apply changes
    04. Extract duplicate disk drive from USB enclosure then move drive and connect it to assigned PC (MBR/BIOS)
    05. Start MBR/BIOS PC by using Windows 10 boot disk, select next "Next" -> Repair your computer -> Troubleshoot -> Advanced options -> Command Prompt, and use the following commands
    * bootrec /fixmbr
    * bootrec /fixboot
    * bootrec /scanos (It should show "C:/ Windows [1]")
    * bootrec /rebuildbcd
    06. Using "bootrec /scanos" should show "Total identified Windows installations: 0" confirming it worked.
    07. Restart the PC, and you should be greeted with a Windows logo screen displaying "Getting devices ready" below it indicating you are now able to successfully boot into the duplicate drive.

    Before:

    After:


    Sources:
    Migrate Windows OS from GPT Disk to MBR SSD without Reinstalling
    How to repair Master Boot Record (MBR) on Windows 10 Pureinfotech
      My ComputerSystem Spec


 
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