Apr 05 2017 10:47 AM
Comprehensive yet quick video 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.
Apr 23 2017 08:58 AM
Tried a lot.
I am getting an "unrecognized partition error".
This is my partition setup.
I have attached the log files below.
Somebody please help :(
Apr 23 2017 10:16 AM
There is a partition on the disk MBR2GPT doesn't like. Try running the following diskpart commands:
DISKPART> select disk 0
DISKPART> list partition
.
.
.
DISKPART> select partition 1
DISKPART> detail partition
.
.
.
(repeat for each partition)
You should be able to see which one is causing issues.
Apr 24 2017 12:48 AM
Mike, I hope you will spend a few minuttes looking over this, as I can't figure it out on my own.
Is the attached information sufficient?
Thanks in advance.
Apr 25 2017 08:17 PM
Error 0x0000057 means: The disk structure is corrupted and unreadable.
Try running chkdsk and see if it finds anything wrong with the disk.
May 08 2017 01:38 AM
May 08 2017 09:31 AM
Sorry - typo on my part. 0x571 is what I meant to type. What make/model is the system and how was it built? If I had to guess, it is having an issue with the third partition. Type 39 is Bell Labs partition type.
May 09 2017 01:21 PM
I understand that the MBR2GRT.exe will support versions of Win 10 previous to 1703 and should work when booted from a Win PE 1703 disk.
So I downloaded & install Windows ADK 1703 & made a Win PE disk. I booted from that disk and ran MBR2GPT /validate and the result was "unable to validate disk." Any ideas? It's a 500gb disk with about 90gb free. Is free space the problem?
Larry Hess CAP | Albuquerque, NM | www.LarryHesscpa.com
May 10 2017 05:52 AM
Hi Mike,
It's a Dell Latitude E7450.
However, I think I've located the problem.
I created a new WinPE image, and now it works. The same system is converted, and BIOS settings changed, and now all is fine.
The new WinPE image is 10.0.15063 where the old one was 10.0.10240
Can you verify that mbr2gpt.exe will only run on WinPE images based on boot.wim from a 1703 media?
May 10 2017 07:22 PM
Yes - it requires WinPE from the ADK 1703 (there are other files that are necessary for it to run correctly). Plus, it is only supported to run on either WinPE 1703, Windows 10 1703 or later.
Jun 14 2017 05:49 AM
Dec 26 2017 08:57 AM
Hi,I can't convert it from MBR to GPT.
This is the error:
MBR2GPT: Attempting to validate disk 0
MBR2GPT: Retrieving layout of disk
MBR2GPT: Validating layout, disk sector size is: 512 bytes
Disk layout validation failed for disk 0
Jan 07 2018 11:11 AM
Thank you for your information. It's very helpfull.
Jan 08 2018 10:07 PM
Feb 16 2018 03:54 AM
For the people who are getting the following error when validating:
Cannot find OS partition(s) for disk X
bcdboot.exe X:\WindowsAfter that it should validate just fine (it did in my case).
Mar 28 2018 06:16 AM
Just done this on one of our work machines. If this works it'll save us bloody hours so cheers MS. One question though it seems to have gotten to "Fixing drive letter mapping" and stopped. Checking everything else it seems fine, disk converted , lovely... so is it safe to restart and change the BIOS/UEFI options or does this take a dam sight longer than the video hinted at?
Up to 40 minutes now.
Apr 06 2018 01:07 PM - edited Apr 06 2018 02:05 PM
I had some error.. I tried this mbr2gpt /validate /disk:1 /allowFullOS /logs:c:\temp\Errors
Error make sense, Msg="ValidateLayout: Too many MBR partitions found, no room to create EFI system partition."
4 primary and no extended is valid for MBR, but tool probably need space to create 1 new partition before conversion.
other problem was not existence of Recovery partition - i just copied it from Windows 7 Efi instalation, is mostly just empty space - to backup image is few MB big.
Apr 10 2018 11:55 AM
This tool is very beta, poor coding, new error:
cannot rely on this space
<z:row Cls="D" Sev="50331648" Maj="Def" Min="Def" LN="4099" Fil="" Fun="pExecuteConversion" Uid="50331648" Msg="MBR2GPT: Partition final size is: 248640438272 (initial size was 248640438272), cannot rely on this space" PID="14424" TID="14612" Con="" Exe="C:\WINDOWS\system32\MBR2GPT.EXE" Mod="MBR2GPT.EXE" Err="0" MD="" DT="2018-04-10T20:48:51"/>
Validation is succeffull.
Apr 17 2018 11:49 PM
I Just resolved the validation issue.
basically you must not have more than three partitions and not any free space left on the hard drive.
if you check the list of partition on DISKPART you will see that even the free space is listed as a partition.
you can use tools like disk manager (built-in windows) or minitool to resize the current partitions to take up the left over free space then validate mbr2gpt again.
hopefully it works for you too :)
let me know
Apr 18 2018 12:30 PM
Here is what my HD looks like using DISKPART:
DISKPART> list volume
Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 E DVD-ROM 0 B No Media
Volume 1 C 790 SSD NTFS Partition 449 GB Healthy System
Volume 2 D Recovery NTFS Partition 15 GB Healthy
Volume 3 RAW Partition 856 MB Healthy Hidden
Volume 4 RAW Partition 455 MB Healthy Hidden
And the attached PDF shows what it looks like using the Disk Management extension of the Computer Management console.
How would you suggest dealing with these partitions in order to be able to sucessfully run MRS2GPT?
Apr 18 2018 12:30 PM
Here is what my HD looks like using DISKPART:
DISKPART> list volume
Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 E DVD-ROM 0 B No Media
Volume 1 C 790 SSD NTFS Partition 449 GB Healthy System
Volume 2 D Recovery NTFS Partition 15 GB Healthy
Volume 3 RAW Partition 856 MB Healthy Hidden
Volume 4 RAW Partition 455 MB Healthy Hidden
And the attached PDF shows what it looks like using the Disk Management extension of the Computer Management console.
How would you suggest dealing with these partitions in order to be able to sucessfully run MRS2GPT?