Convert BIOS / MBR to UEFI / GPT without reformatting - MBR2GPT tool | Prepare for Windows 11
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- Опубликовано: 30 июл 2024
- You can change your partition schema from MBR to GPT and move from BIOS to UEFI without reformatting your hard drive and reinstalling Windows using the built-in MBR2GPT Windows tool. This process can also be used to prepare for Windows 11 upgrades.
In this video, Windows Program Manager, Desmond Lee, shows you how with the MBR2GPT disk conversion tool that’s part of Windows 10. This is a comprehensive and concise overview that explains how you can safely and non-destructively convert a Windows 10 machine from legacy BIOS to UEFI disk partitioning; and how you can automate the conversion as part of your in-place upgrade process from Windows 7 to Windows 10. Importantly, unlike wipe and load methods, all of this can be achieved without having to move your data off the disk.
To learn more please also check out: aka.ms/mbr2gpt
Enjoy us on Instagram: / msftmechanics 
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Have a question about Windows 10? Ask the experts on the Microsoft Tech Community:
techcommunity.microsoft.com/t5/Windows-10/ct-p/Windows10
And to find even more information on the MBR2GPT disk conversion tool, check out this link:
aka.ms/Mbr2Gpt
This guy deserves a medal 🥇. Can't believe this isn't the first search result for fixing this issue. Worked like a charm
Agreed. Glad it helped!
True. After couple of days i am finally able to solve this issue.
He's staring into my soul.
It took me longer to create the windows PE bootable usb than it did to run the mbr2gpt tool. I was like, "no way its done that fast." Swapped my wife's motherboard over to UEFI mode and boom, booted right up to Windows 10. Everything validated in both SystemInfo and by PC Health Check tool.
Plus, I kinda like this guy. He's clearly an engineer and not an actor. Straight to the point. The muzak is perfect. This video is gold and has saved my live. This is my first introduction to this channel. I think I"ll subscribe for content like this.
How did you create the Windows PE bootable and or where did you find the download?
Thank you for this video. You saved me like 40usd in software and/or a few hours of work. I used your tips to convert my OS disk on Win 10 and worked like a charm. Much appreciated!
Wow! That's really cool. I accidentally installed Windows with MBR and it was a hassle to get it to use GPT. I don't have that machine anymore, but I wish I had this feature back then.
Thank You very much for the clear instructions on converting partition styles. I was about to reinstall Windows as I've already backed up my data. This has made the process so much easier. Thank you once again.
I know this video is old but it saved me a lot of time. I was already willing to wipe my hard drive and reinstall whole windows and recover from backup. Thank you so much 😊
Thank you for making a video that is no nonsense and straight to the point with clear instructions and relevant graphics.
Great my friend, excellent presentation. Was ready to buy third party partitioning tool to do the conversion from MBR to UEFI on a refurbished OptiPlex before finding your video. Thanks much.
It was really helpful, thnak you. I converted it while I was already running Windows 10 OS. I just wanted to convert it without losing data or format my PC. Also an action that disables CSM from BIOS helped me to switch to UEFI from Legacy and now I'm able to run Windows 11 installation.
Happy to help
This saved me a LOT of time, thank you.
Looks like a great way to finally convert my Win10 machine (which was in-place upgraded from Win7) to UEFI boot mode. Thanks for creating a tool that makes it easy.
i like this guy he gets to the point
Wasted a whole day and this gave me the answer in a few min.Thx
Thanks a billion. All over the net there are (usually companies trying to sell you their sw) saying you CANNOT convert a drive with partitions / data between GPT and MBR. Just worked fine to get me out of a fix restoring an old MBR image to a new GPT /UEFI computer.
Wow, this works! Thank you so much. My boot up time is like 5 seconds now.
Quite amazing tool, video and step by step process, thank you for that !
You are an absolute lifesaver
It worked like charm
Very easy and understandable explanation, no need to be a hacker to do it
Thank you so much
Perfect. I kept finding conflicting information about data loss with MBR2GPT. This gave me the confidence to try it and it worked. Besides, this actually fixes the UEFI booting problems with a new Dell laptop.
Wow - that was awesome! So fast and easy - thanks a lot!
+Microsoft Mechanics Mr. Desmond Lee, thank you sir so much for such a clear explanation of this wonderful & free tool. This saved me a lot of trouble; I greatly appreciate it.
thanks a lot, I was about to lost 1 TB of data using the others methods, until I found this video and finally I was able to reinstall Windows.
That tool is so awesome!
Works perfectly.
love you Microsoft
EXTREMELY helpful! Thank you!
Thanks you. This fixed my issue. I was able to enable secure boot in the bios and now my pc is compatible with the windows 11 update
Thanks man. Just got an extra 2tb from my 4tb hard drive because of this!
Thank you for the information but I have encountered a problem while converting. The error code: 0x00003687 occurred while trying “creating the EFI system partition”. My system disk has 115 GB of free space when attempting. Please help me find out how to solve this problem. Thanks
How do you remove the existing bitlocker protectors and recreate them?
It worked for me, thanks!
Thanks for explaining it so well.
Here's my issue: I am trying to convert my primary drive with the OS on it from MBR to GPT (NVMe drive). It has another partition on it that stores my programs. No matter what I try, I cannot convert my OS drive to GPT. What needs to be done in order to be successful? Am I going to have to make a back up of sorts for the programs or move them to the main OS drive, remove the partition, and then try mbr2gpt again or is there a workaround for this?
Worked for me with "mbr2gpt /convert /disk:1 /allowFullOS (after /validate disk number). Thanx a lot!
So, can I do this with a Windows 10 1803 bootable USB?
And at the end of the process, would 'Windows Boot Manager' appear as a boot entry?
Thanks.
Thanks for a great video and straight on the subject. One of my storage drives in my workstation (2tb) are almost full and are an MBR-partition. If I want to clone the disk to a larger harddrive, I must first convert with mbr2gpt then clone it to a new 6tb drive (as mbr only works up to 2tb and u need gpt for larger drives). Can I do this without data loss?
Thanks so much dude really saved so much of my time.
if my windows was on legacy mode then can i change it to UEFI?
glad i found this before pulling the trigger to repartition and reinstall windows!
Of all the videos I watched this one actually worked.
i was looking for this!thanks!
I was thinking that would avoid getting infected by ransomware attacks as they modify MBR , however looks to me it's not the case , even you have UEFI you are still exposed to ransomware like recent Petya ... Correct ?
It is now November 2021 almost five full years since you made it, without a doubt the best tutorial I've seen, used and continue to. Thank you. P.S I "Subscribed", clicked the "Bell", choosing "All" your videos
I need to integrate this tool into an SCCM task sequence that can perform the conversion on BIOS systems if need be. Not in-place upgrade, but an SCCM OSD task sequence that can handle bare metal AND "refresh". Can you help me Mr. Lee?
Can this be done from booted OS or do i have to restart and use recovery mode in Win10?
The /allowFullOS gives an error every time i run the command with MBR2GPT tool with admin priviliges. I checked if my notebook actually allows UEFI, and fortunately it does. Help me out with this man! How do i force it to allowFullOS?
One of the best videos. Thanks!
This is very useful. It was quite complicated to convert MBR to GPT without formatting the disk.
Absolute Legend, thanks for this!
Excellent. Thank you so much!
this video saved my Friday evening troubleshooting
Whoa ahead of time!!!
Has anybody ran into an issue with network adapters after running through this process. Our Toshiba laptops and HP desktops were imaged using BIOS (MBR) instead of UEFI. The above process works without an issue in converting the disks to GPT, however, after a Windows 10 upgrade neither the laptops or desktops have any available network adapters. The laptop loses ethernet, Wi-Fi and Bluetooth. I have tried all the obvious things like downloading the latest Win 10 drivers and also run through dozens of fixes for network issues in Windows 10 but nothing has worked. Any suggestions would be greatly appreciated as we are now unable to upgrade any of our computers without performing a clean install.
Excellent guide, thanks!
it is possible to convert mbr to gpt disk which i am using windows 8.1. But i am using mbr2gpt in WinPE 1709?
Thanks! clear, straight to the point and understandable enough for an enthusiast like me, even though its aimed at professionals.
The validate command results in “cannot find os partition(s) for disk 0” any idea why?
Hi, before I try anything I want to know if this would work for my old Dell Inspiron 620. The motherboard bios (version A10) has no option to switch between Legacy and UEFI and in the system details the Bios Mode is set on "Legacy" and Secure Boot State is set on "Unsupported".
I want to change it to UEFI because I want to install my RX 560 but win 10 64bit won't start up, and from what I read and see on videos I need to change it to UEFI.
So if this is possible with an old Dell computer from 2011, let me know, thank you in advance :)
Nevermind I got told and I quote:
"Go to your BIOS settings and go to boot devices and see if it has "CSM" or "Compatibility Support Module"
If that setting exists, your Mobo supports UEFI otherwise it doesn't"
When I tried to convert, it didn't select disk 0, it had displayed disk 1 and then said OS partition is not found
Hi, for me when i tried to convert, it kept saying "Cannot find OS partition(s) for disk 0" please help
makes something that sounds really complicated to a real easy fix. cheers
Came here for the great info. Stayed for the sense of humor.
No way it was that easy 🤦♂️ I formatted my drive and it still didn't work until I tried this. You don't even need to leave Windows 10 for it to work, you can run it within the OS and just reboot into bios, enable UEFI and thats it.
What will happen if power supply to PC go off during this process?
my bios mode is legacy howa can i do to convert to uefi. thx
Hmm for me it says Conversion Completed Successfully but then "Failed to update ReAgent.xml, please try to manually disable and enable WinRE" and the disk still shows as MBR type after, I guess I will try and disable WinRE or something.
C:\WINDOWS\system32>mbr2gpt /validate /allowFullOS
MBR2GPT: Attempting to validate disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Cannot find OS partition(s) for disk
any ideas?
ok, found the solution:
Create A New Recovery Partition
Note: here we take Windows 8 for example.
Step 1: Download your Windows ISO directly from Microsoft, which will require your product key to install. (Note: In many cases, this is included with your Windows computer.)
Step 2: Use Microsoft’s tool to create installation media for Windows.
Step 3: Look for the Sources folder, where you’ll find install.esd. This is the recovery partition, basically, but in its current state it is useless. To make it work for you, you have to first move it from the ISO or DVD to a location on your hard disk. Next, you need to convert it from install.esd to install.wim via some converters like WimConverter tool, and then copy the install.wim file to a new folder on your C:\ drive, labeled C:\Win81-Recovery. The next stage is to register the file so that Windows knows it is there and can create a recovery drive.
Step 4: Right-click the Windows Start screen button and select Command Prompt (Admin) on the desktop. Next, in the command line, enter:
REAGENTC /SetOSImage /Path C:\Win81-Recovery\INSTALL.WIM /Index 1
Tip: This will register the INSTALL.WIM file as your PC’s recovery image.
Step 5: Type: REAGENTC /Info.
Step 6: Type: exit.
Everything worked out very fine! Thank you so much!!
Great to hear!
There is so much info here.will have to watch this vid many times
Absolute godsend of a video now that I have to convert my SSD to upgrade to Windows 11. This guy get's straight to the point and everything is visualized in a great way. All thumbs up!
Thanks
Hello im not that tech savvy ..windows pe ...is this already on my pc or do i need a windows boot disc to get to it
Windows PE is actually the environment where Windows setup runs, so if you have a Windows install disk, that works.
Thank you. Very useful
Great video Love it best explained
Legend!! You saved me a couple of hours
why this message show for me and failed >>> Disk layout validation failed for disk 0 , plz tell me
Sir you are a gentleman and a scholar.
Incredible. Thank you!
Solid tutorial. THANK YOU
Microsoft please keep the same quality this video has as your company motto for coming years 💙💙
i love you guys
great work perfect exoplanation
I love you so much. Thank you!
This still works. Thank you a lot 😄
You're welcome!
Very nice! Thanks.
Perfect. One command and it worked.
MBR2GPT doesn't appear to load after clicking to open it - any idea why?
Thanks, that was so easy :)
Sir,
I need your help, i formatted my c drive when i going to install win 10 pro 64 bit in pc and then now it showing that i have to convert to mbr to gtp, but as i have format the c drive i am not able to start my pc. So now what i have to do to install windows in my pc
Please help me sir..
Thanks for reaching out. The best place for you to get support on this would be at the Microsoft Tech Community. Please post your question there to get answers and to help others: techcommunity.microsoft.com/t5/Windows-10/Shifting-from-BIOS-to-UEFI-with-the-Windows-10-Creators-Update/m-p/60064#M3
Thank you so much!!!
i hve purchased Jumper Ezbook 2. now i want to install the new copy of window 10, but my system is not gona booth woth usb r exernal cd,,,,can you please help me to get its BIOS setting step by step....Bundle of Thanks....
Thanks for reaching out. The best place for you to get support on this would be at the Microsoft Tech Community. Please post your question there to get answers and to help others: techcommunity.microsoft.com/t5/Windows-10/Shifting-from-BIOS-to-UEFI-with-the-Windows-10-Creators-Update/m-p/60064#M3
Amazing tool. Amazing video. 👍
It worked!!! Awesome!!!
You just saved me a lot of trouble. Now I don't have to reformat my entire PC. I'm preparing my Win 10 PC for Upgrading to Win 11.
I get this error when trying to do the /validate
ValidateLayout: Wrong boot partition count, expected 1 but found 0.
Mbr2gpt requires both the system partition and the OS partition to be on the same physical disk. It may be that your system partition is on disk 0, while your OS partition is on disk 1. If you need more in-depth info, we suggest you use the Microsoft Tech Community, where multiple experts have already been answering questions on this subject. Check it out here: techcommunity.microsoft.com/t5/Windows-10/Shifting-from-BIOS-to-UEFI-with-the-Windows-10-Creators-Update/m-p/60064#M3
if i have a option in my boot settings to change to UEFI(my machine is already is on legacy), so what is the meaning of “UEFI is now on its way to replacing outdated BIOS”. Since i also do have the choice to set it to UEFI instead of having BIOS.
Am I the only one to notice the date of 2017 and it saying "Prepare for Windows 11". I know it was probably changed afterwards, but got me confused for a bit
We added that to help with preparing for Windows 11, as it requires UEFI and GPT partitioning
Does this have to be done in Windows PE or can I do it just from cmd in Windows Recovery Environment?
Yes, this can be run from Windows RE.
@@MSFTMechanics thank you! Do I need to backup my drive or is it safe to do the process without the loss of data?
It's never a bad idea to back up your drive, but the mbr2gpt tool is designed to be non-destructive, so it shouldn't compromise your data. That said, I personally would still back up my important files at least using OneDrive Known Folder Move or similar to be safe and to have a back up in place for the future.
@@MSFTMechanics thank you so much for the reassurance!
I first was getting permanent errors. My bad, needed to run as Admin. It took a bit at "trying to shrink the system partition" but when i checked back it was finished. probaply 1minute max.
Very easy understandable tutorial, could improve in saying to run as Admin. else it helped me alot to finally be able to get windows 11
Can someone help me get a copy of the MBR2GPT.exe file by itself? I downloaded the 15007 iso and cracked it open but still can't find the file. Many thanks in advance! Cool upload btw
What do you do if the validation fails?
can I change MBR to GPT Windows 7 without upgrade to Windows 10
Yes, you can change MBR to GPT in Windows 7. Check out this link for more details: technet.microsoft.com/en-us/library/cc725671(v=ws.11).aspx
THANK YOU!
Good lord, I was gonna buy a whole new rig if it wasn't for this video.