I want to switch to uefi mode. So, I tried to convert my computer's partition style from MBR to GPT. But, whenever I execute the command 

mbr2gpt /validate 

It says "can't found os partition(s)"

I recently deleted 450 MB recovery partition,which I had to delete as I came to know that the command don't work when there are more than 3 primary partition. 

What could I do know? 

I want a way which is free and don't require wiping all my data. 

Thanks in advance. 


ok I recreated your setup & used the following to resolve it:

(some advanced steps required)

you will need Windows 10 Setup media to recover the WinRE.wim, if you don't have this you can user

Media Creation Tool

To avoid the need for extra partitions, I used a folder c:\recovery

mount your setup media (iso or usb) 

in an elevated prompt run the following commands:

creating folders

md c:\recovery

md c:\recovery\mount

** mounting Windows Image from media

** (if setup media drive letter is not e: replace the e:\ with the correct driveletter)

dism /mount-wim /wimfile:e:\sources\install.wim /index:1 /mountdir:c:\recovery\mount /readonly

** Copying WinRE.wim from image

copy "C:\Recovery\mount\Windows\System32\Recovery\Winre.wim" c:\recovery\

** Unmounting Image

dism /unmount-wim /mountdir:c:\recovery\mount /discard

** Enable WinRE

reagentc /SetReImage /Path c:\recovery\winre.wim /index 1

reagnetc /enable

reagentc /info

** The last command should show RE enabled, after this I was able to successfully run MBR2GPT

Erik Moreau

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Last updated January 31, 2020 Views 178 Applies to: