Re: BIOS_grub GUID signature within an EFI partition?

[Bret Busby]

On 13/9/23 18:01, Pascal Hambourg wrote:
> On 13/09/2023 at 11:47, Goh Lip wrote:
> > On 9/13/23 15:15, Andrei Borzenkov wrote:
> > > On Wed, Sep 13, 2023 at 9:53 AM Goh Lip <g.lip@gmx.com> wrote:
> > > > You cannot mix efi and legacy install in the same disk
> > >
> > > You most certainly can as long as you have some way to select the boot
> > > method.
>
> Right.
>
> > From a boot system of *another* disk or usb?
>
>  From the sams disk or media.
>
> > Certainly not a boot system from that same disk, can it?
> > A bios-grub and a efi-grub residing in the same disk? Possible?
>
> Yes. BIOS-GRUB in the MBR and the BIOS boot partition, EFI-GRUB in the 
> EFI system partition.

You might want to read
https://en.wikipedia.org/wiki/GUID_Partition_Table

MBR was superseded by GPT.

Both Legacy BIOS and UEFI can work with GPT, and, both Legacy BIOS and 
UEFI can be used to install operating systems that can boot on a GPT 
drive, where some operating systems (such as MS Windows) are installed 
via UEFI, and, some (such as Linux) are installed via Legacy BIOS).

And, current Linux versions can be installed via UEFI...

And, GRUB "happily" deals with them all...

(Big GRUBby smile...)

..
Bret Busby
Armadale
West Australia
(UTC+0800)
..............