Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop

On 2025-10-31 13:56, Java Jive wrote:
> As per subject, as I now have on the same PC some OSs  -  Ubuntu24, 
> Windows7/10  -  installed on an MBR disk and Windows 11 installed on a 
> GPT/UEFI disk, I'd like if possible to find a way of booting any of 
> them, and MBR/GPT USB sticks, without constantly having to change the 
> BIOS settings on the PC.
> 
> Research into whether this is possible seems to produce mixed results, 
> mostly not, but a few suggesting it's possible, but I haven't yet found 
> anything with clear and understandable instructions on how to achieve it.
> 
> My own gut feeling is that it should be possible, but, while I have a 
> good understanding of how a PC boots an MBR disk, I have less 
> understanding how one boots a GPT/UEFI disk.
> 
> Has anyone here been able to achieve this?  Does anyone know of good 
> reliable sources of information about this?

I think it might work if the system is UEFI with GPT disks, if you put 
the other system in a partition, with boot code in the start record of 
that partition. You would then need "something" in /boot/EFI to load 
that boot code in that partition.

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;