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 <[email protected]> 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.
A caveat is that some broken BIOS/UEFI firmware require that a MBR
partition entry has the boot flag set for BIOS boot, and/or the
protective GPT partition entry does not have the boot flag set for EFI
boot (so parted disk_flag pmbr_boot won't work). My usual workaround is
to set the boot flag on an empty MBR partition entry with sfdisk, but it
is ugly and fragile because partitioning tools often remove it.
