Re: BIOS_grub GUID signature within an EFI partition?

[Andrei Borzenkov]

On Wed, Sep 13, 2023 at 12:48 PM Goh Lip <gohlip@gmx.com> 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. You cannot use the same partition both as ESP and BIOS_grub,
> > that's true.
> >
>
>
>  From a boot system of *another* disk or usb?
> Certainly not a boot system from that same disk, can it?
> A bios-grub and a efi-grub residing in the same disk? Possible?
>

Of course it is possible. What makes you think it is not? You can even
have both for the same operating system instance using the same common
/boot/grub/grub.cfg.

> What OP can do now is to make this disk fully uefi (without reinstalling
> OS). Create a /boot/efi partition (or use this bios_grub - partition is
> big enough), make a /boot/efi entry in /etc/fstab. Redo grub-install (in
> uefi).
>
>