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
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.
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.
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 😊
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 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!
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
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.
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.
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.
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.
Works perfect on a virtualized Server 2019. I did get a message after booting up that I needed to reboot OS to repair disk. It repaired super fast, and I have no experienced any issues at all. Make sure to change BIOS to EFI (vsphere edit vm settings > VM options > Boot options > change firmware to EFI, and enable Secure boot).
+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.
Work perfectly. The mbr2gpt validate did fail due to 4 partitions but just offloaded-deleted a partition and reloaded after the successfully converting..
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.
2:39 If you're getting Failed to retrieve geometry for disk -1 then you maybe scanning the USB instead of the drive you want. Just do: diskpart list disk Then work out which one is your boot disk. Then exit Then mbr2gpt /disk:0 /validate In my case it kept trying to validate the USB stick instead of the system drive so you tell it which drive to check with the disk:0 bit as my system drive is disk 0 You also want to point to it in the convert so mbr2gpt /disk:0 /convert
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!
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
/Validate works fine. /Convert it says Cannot find room for the EFI system partition (I have 130GB free on C:) I have tried some unallocated space and tried to convert that into EFI & NTFS & New Volume & left it blank. Tried in windows PE environment & disabling reagentc. Layout is: System reserved - C: - Recovery (3 or less as required) I have asked ChatGPT Google watched ITArmy on UA-cam I still cannot get this to work out and I don't know why. 🤯🤔🤨🤬
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?
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.
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.
At present I run Windows 10 in MBR. In my PC in the BIOS setup menu, I do not have UEFI option at all. How do I go about? My plan is to install Windows 11.
in any different cases, donot change to gpt scheme before making sure our bios and motherboard pc support uefi system ,specially old notebook ect .. make sure backup our data first before run any effort
Thanks a lot for this video. Was very helpful and timesaving. Although I believe you should have included a way to download + install WindowsPE. Anyway, all was successful and again thanks a lot for the guidance.
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?
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
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
Worked after i shrunk my c drive partition... which gave me 3 partitions, one being unallocated nothing... ran the mbr2gpt /disk:1 (that's my main disk...) /validate, and then convert. So after adding the 3rd partition in windows disk management..i then booted back into winpe mode... Mbr2gpt /disc:1 /validate Mbr2gpt /disk:1 /convert Exit Then change to uefi in bios.
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 ?
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.
i accidently turned off my pc then it changed from UEFI to LEGACY only in the bios information, that could be becuase ive done this before and shutting off the pc by accident reverted it through a backup it had but hopefully this fixes it. P.S restarting your drive fully wont remove the issue either.
When in Windows PE mode and I am validating the disk, I receive this message "disk layout validation failed for disk 0". Not sure what to do on this part. Is there a fix? I have the latest Windows 10 version and the disk is a Samsung SSD 980 PRO 2TB with 2 partitions.
It sounds like your partitions could not be resized to free up space for GPT partitioning. It could be file encryption related. Are you able to resize/shrink your primary partition with volume C?
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.
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?
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
Wasted a whole day and this gave me the answer in a few min.Thx
Thank you for making a video that is no nonsense and straight to the point with clear instructions and relevant graphics.
He's staring into my soul.
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 😊
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 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!
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 like this guy he gets to the point
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.
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.
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.
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.
Works perfect on a virtualized Server 2019. I did get a message after booting up that I needed to reboot OS to repair disk. It repaired super fast, and I have no experienced any issues at all.
Make sure to change BIOS to EFI (vsphere edit vm settings > VM options > Boot options > change firmware to EFI, and enable Secure boot).
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.
Thanks for the guide. I can FINALLY update to Windows 11 after a ton of headache.
+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.
This saved me a LOT of time, thank you.
Worked for me with "mbr2gpt /convert /disk:1 /allowFullOS (after /validate disk number). Thanx a lot!
Work perfectly. The mbr2gpt validate did fail due to 4 partitions but just offloaded-deleted a partition and reloaded after the successfully converting..
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.
Thanks man. Just got an extra 2tb from my 4tb hard drive because of this!
2:39 If you're getting Failed to retrieve geometry for disk -1 then you maybe scanning the USB instead of the drive you want.
Just do:
diskpart
list disk
Then work out which one is your boot disk.
Then exit
Then
mbr2gpt /disk:0 /validate
In my case it kept trying to validate the USB stick instead of the system drive so you tell it which drive to check with the disk:0 bit as my system drive is disk 0
You also want to point to it in the convert so
mbr2gpt /disk:0 /convert
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
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
That tool is so awesome!
Works perfectly.
love you Microsoft
This is very useful. It was quite complicated to convert MBR to GPT without formatting the disk.
Quite amazing tool, video and step by step process, thank you for that !
glad i found this before pulling the trigger to repartition and reinstall windows!
Of all the videos I watched this one actually worked.
Wow, this works! Thank you so much. My boot up time is like 5 seconds now.
Whoa ahead of time!!!
Thanks! clear, straight to the point and understandable enough for an enthusiast like me, even though its aimed at professionals.
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
Microsoft please keep the same quality this video has as your company motto for coming years 💙💙
this video saved my Friday evening troubleshooting
makes something that sounds really complicated to a real easy fix. cheers
There is so much info here.will have to watch this vid many times
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 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
EXTREMELY helpful! Thank you!
Sir you are a gentleman and a scholar.
Absolute Legend, thanks for this!
What a great video!! It was so helpful thank youuuu!!!
Wow - that was awesome! So fast and easy - thanks a lot!
Everything worked out very fine! Thank you so much!!
Great to hear!
It worked for me, thanks!
Thanks so much dude really saved so much of my time.
Came here for the great info. Stayed for the sense of humor.
/Validate works fine.
/Convert it says Cannot find room for the EFI system partition (I have 130GB free on C:)
I have tried some unallocated space and tried to convert that into EFI & NTFS & New Volume & left it blank.
Tried in windows PE environment & disabling reagentc.
Layout is: System reserved - C: - Recovery (3 or less as required)
I have asked ChatGPT Google watched ITArmy on UA-cam I still cannot get this to work out and I don't know why. 🤯🤔🤨🤬
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?
I like the cut of this bloke's jib. Subscribed 👍🏻
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.
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.
Perfect. One command and it worked.
This still works. Thank you a lot 😄
You're welcome!
Legend!! You saved me a couple of hours
At present I run Windows 10 in MBR. In my PC in the BIOS setup menu, I do not have UEFI option at all. How do I go about? My plan is to install Windows 11.
its works without any issue using WinPE
in any different cases, donot change to gpt scheme before making sure our bios and motherboard pc support uefi system ,specially old notebook ect .. make sure backup our data first before run any effort
i love you guys
great work perfect exoplanation
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.
Excellent. Thank you so much!
It worked!!! Awesome!!!
Thanks a lot for this video. Was very helpful and timesaving. Although I believe you should have included a way to download + install WindowsPE. Anyway, all was successful and again thanks a lot for the guidance.
Glad it helped!
This guy is a fucking G bro I love how it's just no bullshit.
One of the best videos. Thanks!
i was looking for this!thanks!
Thank you, you saved my life!
thank you SO MUCH Your rescued me lIke 4 Hours :)
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?
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
Incredible. Thank you!
Thank you. Very useful
if my windows was on legacy mode then can i change it to UEFI?
Good lord, I was gonna buy a whole new rig if it wasn't for this video.
thx, great video, to the point and . . this works !!
thanks
Can this be done from booted OS or do i have to restart and use recovery mode in Win10?
Solid tutorial. THANK YOU
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
Very nice! Thanks.
When I tried to convert, it didn't select disk 0, it had displayed disk 1 and then said OS partition is not found
Great video Love it best explained
MBR2GPT doesn't appear to load after clicking to open it - any idea why?
Worked after i shrunk my c drive partition... which gave me 3 partitions, one being unallocated nothing... ran the mbr2gpt /disk:1 (that's my main disk...) /validate, and then convert.
So after adding the 3rd partition in windows disk management..i then booted back into winpe mode...
Mbr2gpt /disc:1 /validate
Mbr2gpt /disk:1 /convert
Exit
Then change to uefi in bios.
Amazing tool. Amazing video. 👍
The validate command results in “cannot find os partition(s) for disk 0” any idea why?
Awesome video!
Hi, for me when i tried to convert, it kept saying "Cannot find OS partition(s) for disk 0" please help
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 ?
AWESOOOME!
it is possible to convert mbr to gpt disk which i am using windows 8.1. But i am using mbr2gpt in WinPE 1709?
How do you remove the existing bitlocker protectors and recreate them?
Thanks, that was so easy :)
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.
i accidently turned off my pc then it changed from UEFI to LEGACY only in the bios information, that could be becuase ive done this before and shutting off the pc by accident reverted it through a backup it had but hopefully this fixes it. P.S restarting your drive fully wont remove the issue either.
When in Windows PE mode and I am validating the disk, I receive this message "disk layout validation failed for disk 0". Not sure what to do on this part. Is there a fix? I have the latest Windows 10 version and the disk is a Samsung SSD 980 PRO 2TB with 2 partitions.
It sounds like your partitions could not be resized to free up space for GPT partitioning. It could be file encryption related. Are you able to resize/shrink your primary partition with volume C?