Windows Forum·65,810 discussions

Windows 10 new tool MBR2GPT

Tags: Windows

I want to convert my Legacy Boot to UEFI and I understand the above feature in Wins 10 Ver.1703 or later (mine is V 20H2) will do this without doing a complete new reinstall of Wins. The instructions for the procedure at https://docs.microsoft.com/en-us/windows/deployment/mbr-to-gpt Has anyone used this or would there be any risk in doing so? I would like to do this on my HP ProBook mod 6570b

Topic

Yes. There is always a risk.

In reply to Windows 10 new tool MBR2GPT

That’s why we have backups. That way if the procedure fails we can restore from backup. Also, small world as we have a few of that model Probook at the office. They seem to be tanks and run W10 off the SSD drives very nicely.

MBR2GPT

In reply to Yes. There is always a risk.

Thx. for prompt reply Robert and glad to find you on this site. My ProBook is bare bones at the present although I have a recovery disk if things go South.

Are there any more details available?

In reply to Windows 10 new tool MBR2GPT

Why I ask is someone had an older PC that didn’t have the UEFI BIOS so they forced a conversion and effectively killed that OS installation.

Also, similar answers at https://superuser.com/questions/1167484/what-happens-if-i-switch-to-uefi-mode-after-install-windows-10-in-legacy-mode about backups.

Other Details

In reply to Are there any more details available?

A bit of detail that could be relevant to this boot change is my current BIOS options both “legacy” and “UEFI” are listed with the UEFI option greyed out and the Legacy option hi-lighted. So I am assuming because UEFI is listed once the disk is converted to GPT the system should run under UEFI. Your confirmation of my assumption would be appreciated as well as all the time you given to this inquiry.
Ken

That’s good news.

In reply to Other Details

And you are correct. I’ve only done this conversion a few times. The only reasons were:
1. The owner/client wanted it.
2. A change in the video card to one that demanded the EUFI BIOS be used.

MBR2GPT

In reply to That’s good news.

Through the “recovery setting” I got to “command prompt” in “admin permission” the mbr2gpt /validate was successful but then I did mbr2gpt /validate/allowfullos it listed all the commands associated with mbr2gpt .From the first /validate should I just go to mbr2gpt /convert Hope you can makes sense of this. The good thing at this point I didn’t get jammed up I just exited and it booted up fine

I am guessing you need a fine tutorial.

In reply to MBR2GPT

https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10 has pictures of what to do and expect.

I Blew It Entering Command

In reply to I am guessing you need a fine tutorial.

The problem it didn’t complete conversion on the first attempt is stupid me I was not leaving a space before each forward / It is all converted now and booting in UEFI all partitions showing healthy. There is only one thing while in “command prompt” a line read….mbr2gpt failed to update ReAgent.xml please try to manually disable and enable WinRe . Anything there I need to take care of ?

Seems that’s normal.

In reply to I Blew It Entering Command

While annoying it appears you disable then enable WinRE.

Found with https://www.google.com/search?&q=mbr2gpt+failed+to+update+ReAgent.xml

Did The “disable/enable” Thing

In reply to Seems that’s normal.

Thx for all your time and the informational links I have everything inorder her now

[Author]

Replies