[SOLVED] MBR2GPT Error: Cannot create EFI system partition.

[heartkiIIer]

I'm trying to convert from MBR to GPT using MBR2GPT tool in order to switch from Legacy BIOS to UEFI. I'm following the steps from this blog, the validation is successful, but I am still getting the error while converting. I browsed around around the web but none of what I found was much help.

My disk management;

https://imgur.com/a/Bl1eJMq

The error:

https://imgur.com/a/vtiI2bN

Any help is appreciated!

 

[Satan-IR]

What is the disk? HDD or SSD? What's your system? A desktop or a laptop? laptop from some manufacturers have system reserved partitions with different IDs than Windows default data disks.

Have you tried the conversion in Windows PE?

Is the drive encrypted with BitLocker? You have to suspend encryption/BitLocker before conversion.

Also if the drive is a hard disk try defragmenting it if defragmentation is needed before conversion.

 

[SkyNetRising]

I'm trying to convert from MBR to GPT using MBR2GPT tool in order to switch from Legacy BIOS to UEFI. I'm following the steps from this blog, the validation is successful, but I am still getting the error while converting.

Delete 17GB recovery partition.
Execute in elevated command prompt:

diskpart​

list disk​

select disk 0​

list partition​

select partition 1​

(select 17GB partition)​

delete partition override​

exit​

 

[heartkiIIer]

What is the disk? HDD or SSD? What's your system? A desktop or a laptop? laptop from some manufacturers have system reserved partitions with different IDs than Windows default data disks.

Have you tried the conversion in Windows PE?

Is the drive encrypted with BitLocker? You have to suspend encryption/BitLocker before conversion.

Also if the drive is a hard disk try defragmenting it if defragmentation is needed before conversion.

It's HDD on a PC. And t's not encrypted with BitLocker. And I haven't tried Windows PE yet.

 

[heartkiIIer]

Delete 17GB recovery partition.
Execute in elevated command prompt:

diskpart​

list disk​

select disk 0​

list partition​

select partition 1​

(select 17GB partition)​

delete partition override​

exit​

I did it, and it looks like this now.

https://imgur.com/a/QYAXbCt

And now I get this error.

https://imgur.com/a/jdyQNEl

 

[SkyNetRising]

Probably bootloader needs fixing to remove references to missing recovery partition.
Execute from elevated command prompt.

bcdboot c:\windows​

​

It may be necessary to reboot the system also.

 

[heartkiIIer]

Probably bootloader needs fixing to remove references to missing recovery partition.
Execute from elevated command prompt.

bcdboot c:\windows​

​

It may be necessary to reboot the system also.

That fixed it. Now I was able to validate but now I get the original error while converting:

https://imgur.com/a/vtiI2bN

 

[falcon291]

I don't know but are you trying to shrink the OS System Drive?

Create Windows installation USB, and try what you are trying to do starting with that USB.

 

[SkyNetRising]

That fixed it. Now I was able to validate but now I get the original error while converting:

Does your system support UEFI boot?
If it doesn't then after conversion you will not be able to boot your system.

 

[heartkiIIer]

Does your system support UEFI boot?
If it doesn't then after conversion you will not be able to boot your system.

I'm not sure how to check that. But I wasn't able to covert it from MBR to GPT anyway.

 

[SkyNetRising]

I'm not sure how to check that.

You check specs of your pc or
look into BIOS and try to find anything mentioned about UEFI.

From BIOS screens in your other topic - it doesn't support UEFI.