uefi boot from non GPT disks?

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  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8680
    • USA
    #1

    uefi boot from non GPT disks?

    Any opinions on how many bios implementations will boot UEFI system partitions that are on MBR disks?

    I'm beginning to find perhaps that there indeed are UEFI firmware implementations that won't boot off of MBR disks that have an ESP (flagged with 0xEF). Some do and some don't, some will definitely boot off of removable media with MBR and 0xEF ESP but not hard drives...

    Is there a rule that GPT partitioning is required for hard disks to boot? Seems that CDROM (El Torito) and removable USB media do not need to be GPT, and MBR is fine?
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