Change MBR to GPT

[jaydub]

Hi. I use MBR BootIt Bare Metal to operate Windows 11 + two linux distributions on an MBR disk. I want to change to GPT, so can I do the following:
- Backup the O/S's to another HDD
- Change the original HDD to GPT, reformat, and then re-install UEFI BBM
- Restore the O/S's to the newly changed HDD?

If not, is there a way to accomplish what I'm trying to accompliish which is converting my disk to GPT without having to re-install Windows 11

[Brian K]

jaydub,

Start with this,

https://www.terabyteunlimited.com/kb/kb ... bs-script/

After you have Win11 booting you can install BIU. Let us know when you are at this stage and you can consider adding your two Linux OS to the BIU Boot Menu.

[Brian K]

This method doesn't work with Linux installed on a MBR disk and then transferred to a GPT disk. It does work for Linux installed to a GPT disk.

sudo mount /dev/sdXY /mnt
sudo mount /dev/sdXX /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sdXX
update-grub

... Note : sdXX = efi partition | sdXY = Linux system partition


I've discovered a method to make Linux previously on a MBR disk, boot on a GPT disk. It should work on jaydub's system.