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    June 5, 2023 @ 2:24 pm

    aaghh I did what it said exactly I have 2 disks in my set up but now it shows didn't found operating system and when I open boot mode there's no option for changing bios legacy to uefi I am stuck I just wanna know if I download windows again from usb would it work ?


    • lakonst
      June 6, 2023 @ 9:17 am

      As mentioned in prerequisites, your PC must support Legacy & UEFI, otherwise this article does not apply to you. If you have already made the conversion to GPT and you're sure that your PC does not support UEFI, I suggest to backup your files to another storage device and then to perform a clean Windows installation, booting from a USB Windows installation disk, created for a LEGACY (MBR) system.


  2. Neil B.
    January 10, 2023 @ 10:47 pm

    Didn't work for me, there seems to be a massive bunch of things that stop this process from working, almost none of which you can recognise or fix. As far as I can tell, I have none of the things that would cause it to fail, but still it fails. I've reached the point where Visual Basic won't write programs unless W11 is installed and I don't know enough about VB to cure that, and I can't cure my drives.
    I suppose I could reinstall from scratch, but downloading about 60GB of Steam games, a few odd development packages and video editors, backing up 60 GB of photos, 50GB of music, another 50GB of videos and then finding out that I have lost something vital just doesn't appeal to me.

    In true Microsoft tradition, there are no helpful error messages, just "validation failed".


  3. Dexter
    April 26, 2022 @ 3:28 pm

    I tried to convert MBR to GPT using command prompt but encounter error message below.

    "Cannot find OS partition(s) for disk 0"


    • lakonst
      April 27, 2022 @ 9:14 am

      How many disks have you installed? If you have more than one, disconnect the others and leave only the main Windows disk. Then try again to do the conversion.


      • Dexter
        April 27, 2022 @ 2:17 pm

        Thank you for your reply.

        It was originally 1TB HDD but because the speed was too slow so I upgraded it to SSD 1TB.


  4. Buddy
    February 12, 2022 @ 3:53 am

    Great guide but I need a little clarification after reading some comments.
    I have three drives, one with Windows and various files, and two filled with games/media.
    The comments say to disconnect secondary drives, but don't explain when to disconnect them or if reconnecting them will work.

    How do I keep full function of all three drives using this method?


    • lakonst
      February 13, 2022 @ 11:48 am

      1. Disconnect any other drives except the Windows drive.
      2. Change Legacy to UEFI by using the instructions on the article.
      2. After the change ensure that you can boot to Windows and then shutdown your PC.
      3. Reconnect the other drives. Windows should recognize them without any problems.


  5. J
    October 16, 2021 @ 12:45 am

    Method 1 worked perfectly.


  6. Lucas
    October 7, 2021 @ 10:38 pm

    If you're reading this before pulling the trigger, be aware if you have 2 different disks it will only convert one and your PC wont boot unless you remove the second one.


    • Buddy
      February 13, 2022 @ 2:35 am

      I can't seem to find any info on this here in the comments. Do you know how I would proceed with this if I have several drives installed? The main drive is my OS and random files. The other two drives are games and media. I obviously want them to work after the change. Is this possible?


    • Marius
      September 23, 2022 @ 11:50 am

      Hello, I'm using a laptop with 1tb hdd and (idk if i have an ssd but i think a have one tho) it will be a problem if i do these steps?


  7. Sam
    June 30, 2021 @ 10:38 am

    Method 1 worked fine for me and I now have a PC that will run Windows 11 when it is finally rolled out. I encountered only one problem and that was a message at the end concerning the repair partition "failed to update ReAgent.XML" Currently ignoring that.


  8. Tumahara Baap
    June 26, 2021 @ 2:26 am

    Bhag BSDK Madherchod don't works.


  9. Lawrence
    March 5, 2021 @ 7:09 pm

    Thanks so much. I accidently changed my boot drive to GPT which left my machine unable to find the boot drive. Nothing else I could find online was much help.
    Amazing side. I will certainly make use of and refer others


    February 13, 2021 @ 8:58 am

    Thank you so much, my new PC build booted in legacy mode. I have searched a lot, there is no good website that describes the method this way, not even on YouTube. This website is GEM. I have successfully booted it in UEFI mode. Love…


  11. Pedram
    February 3, 2021 @ 11:43 am

    You guys are the best, but I still have trouble with this. I use mettod1 one for my laptop and it works great but in my pc it's not working .I use SSD on both systems and my motherboard on pc is P8h61/usb3.0.could you please Help Me? thank you so much!


  12. Rob
    September 29, 2020 @ 7:16 pm

    Will this process convert all attached physical drives to GPT or just the primary boot drive? Nice, clear instructions thanks.


    • lakonst
      September 30, 2020 @ 8:56 am

      This article was written with only one drive attached. Since MBR2GPT can convert ANY attached MBR-formatted system disk to the GPT partition format, I recommend to unplug any other drive and to keep only the main OS drive connected.


      • Rob
        September 30, 2020 @ 3:13 pm

        Thanks for the fast reply.


  13. Biktor Jackston
    June 8, 2019 @ 12:51 am

    Worked like a charm. Thank you very much !


  14. Benedict
    May 30, 2019 @ 10:34 am

    You guys are the best, keep up the good work


  15. Liki
    May 30, 2019 @ 5:26 am

    How do you shutdown and power on the computer after the third step?


    • lakonst
      May 30, 2019 @ 10:30 am

      @Liki: Just press the Power button for a couple of seconds until your PC turns off.


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