Problem creating EFI system partition

cereberus · 03 Dec 2022

FreeBooter said:

In this video, i will show you how to create EFI partition from within Windows Recovery Environment.

This is not the issue. As @Ghot says, mbr2gpt cannot create an EFI partition until OP deletes a partition as mbr pcs can only have 4 primary partitions, so you have to only have 3 before you use mbr2gpt, so it can create the efi partition.

zbook · 04 Dec 2022

Open administrative command prompt and type:

Code:

reagentc /disable
diskpart
sel dis 3
det dis
lis vol
lis par
sel par 4
delete partition override
lis par
exit

reagentc /enable

Type:

ctrl + a
ctrl + c

Post into this thread typing: ctrl + v

Please run these scripts and post share links into this thread using one drive, drop box, or google drive.

https://www.tenforums.com/attachment...p_plus_log.bat

https://www.tenforums.com/attachment...iskparinfo.bat

Open administrative command prompt and type:

mbr2gpt /validate
mbr2gpt /convert /allowfullOS

If MBR2GPT works then you're set.

For any failure run:

https://www.tenforums.com/attachment...on_mbr2gpt.bat

SIW2 · 04 Dec 2022

Raner said:

Attachment 380428
If so which one would be safe to delete.

either

cereberus · 04 Dec 2022

SIW2 said:

either

Not really. Amost certainly the one to delete is the last one.

If you delete wrong one, you can end up with older winre.wim plus hassle of making partition the active recovery partition.

The safest way to identify which one to retain is to run

reagent /info

from a command prompt to tell you which partition is active. Note - you need to include the hidden msr partition if present when counting partition number.

NavyLCDR · 04 Dec 2022

cereberus said:

Not really. The safest way to identify which one to retain is to run

reagent /info

from a command prompt to tell you which partition is active. Note - you need to include the hidden msr partition if present when counting partition number.

The safest thing to do is;:
reagentc /disable

Then delete all recovery partitions.

cereberus · 04 Dec 2022

NavyLCDR said:

The safest thing to do is;:
reagentc /disable

Then delete all recovery partitions.

I just said safest way to identify which one to delete. If you do disable, and delete both, you end up with a non standard UEFI (MS) layout. I agree it is no big deal - up to OP to decide.

Megahertz · 05 Dec 2022

The most simple solution is the one given by NavyLCDR on post #10.