[SOLVED] Help with re-formatting to GPT

[Ultimametal]

Hello,

Having problems with new install. I'll keep to the fine points.
Went from Win7 x64 to Win10 x64. For unknown reason it installed x32 instead (possibly because HDD was MBR prior so it defaulted?)
Used the command mbr2gpt /convert successfully before attempting new Win10 install.
Problem now is cannot boot anything. I have 2 USBs with Win11 MBR and Win11 GPT that dont work and even tried an old Win7 disk.
Doesn't load no matter what boot option choose. Goes straight to black screen with flashing cursor

Any advice or similar link?

 

[rgd1101]

so you can't boot or can't install windows?
full system spec?

 

[SkyNetRising]

Went from Win7 x64 to Win10 x64. For unknown reason it installed x32 instead (possibly because HDD was MBR prior so it defaulted?)

Doesn't work that way.
Upgrade to 32bit Windows 10 is possible only from 32bit previous version of windows.
If you did clean install and ended up with 32bit windows, then 32bit windows 10 install media was used (not 64bit install media).
This has nothing to do with MBR or GPT.

List full specs of your system. It might not support UEFI boot. Then you can not boot from GPT drive.

 

[Ultimametal]

System Spec:

MB - Gigabye GA 78LMT
6 core AMD Vishera
GPU - Radeon R7 370
12g of DDR3 ram
128gb SSD main
2 TB HDD backup

 

[Ultimametal]

Doesn't work that way.
Upgrade to 32bit Windows 10 is possible only from 32bit previous version of windows.
If you did clean install and ended up wind 32bit windows, then 32bit windows 10 install media was used (not 64bit install media).

I'm sure I had x64 architecture prior but I thought perhaps it reverted to x32 because I read somehow Win10 doesnt fully support Legacy. I know Win11 now is supposed to be only UEFI so figured they phased it out.

I've looked everywhere in this BIOS 100 times today and there's no option so go from UEFI to Legacy. Only an option on the USB to enable legacy functionality. Thats it..

 

[Colif]

that won't install win 11, grab a win 10 drive
its not compatible with win 11. its too old.

did you swap bios to UEFI after running mbr2gpt?

How to switch from Legacy to UEFI boot mode (MBR2GPT conversion)

In the context of my work as a system administrator from time to time I have to deal with desktop / client issues in addition to infrastructure and server problems. So I recently had to cope with 2 problems that had the same cause. Case 1:On one workstation, Bitlocker had

it-infrastructure.solutions

Used the command mbr2gpt /convert successfully before attempting new Win10 install.

clean install of win 10 includes a format. Running mbr2gpt before that was a waste of your time, as its included in process.

 

[SkyNetRising]

MB - Gigabye GA 78LMT

Your board has something called Hybrid EFI technology. Not exactly sure, how that works.
Definitely not true UEFI Bios.

Just stick with MBR and legacy install.

 

[Ultimametal]

Your board has something called Hybrid EFI technology. Not exactly sure, how that works.
Definitely not true UEFI Bios.

Just stick with MBR and legacy install.

How can I convert back to MBR from the bios menu? As it stands I can't boot to anything

 

[SkyNetRising]

Clean the drive before installing windows.
Press Shift+F10 during install to open command prompt. Use diskpart clean method.
Clean command removes everything from the drive - all partition information, all data.

 

[Colif]

shame there is no gpt 2 mbr as well, its not a process many would want to do. GPT is future, MBR is past.
I was wondering until I saw Skynets reply

 

[Ultimametal]

That was actually my next question and quite unfortunate to learn. Oh well
Just have to take it as a lesson for doing things without proper verification. Looks like my mobo was on the verge of the UEFI revelation but didnt quite make it! A damn shame

Thanks for your help @SkyNetRising and everybody else for the support!