[SOLVED] Help with re-formatting to GPT

Ultimametal

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Feb 7, 2014
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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?
 
Solution
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?


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.
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.
 
Last edited:

Ultimametal

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Feb 7, 2014
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18,510
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

Win 11 Master
Moderator
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?


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.
 
Solution
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.

delete-clean-partition-diskpart-windows10.jpg
 

Ultimametal

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Feb 7, 2014
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18,510
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!
 

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