Is EFI booting something hardware specific? I have a desktop motherboard with a UEFI Bios, but I can only boot from USB drives in "UEFI" mode. Both the DVD drive and the HDD's (a RAID 0 array) boot only on legacy mode. Do the HDDs need to have a GPT partition table in order for them to boot in UEFI mode?
UEFI Boot – Do Hard Drives Need GPT to Boot in UEFI Mode?
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Best Answer
(U)EFI-based systems, by specification, can only boot from GPT-style disks. The traditional BIOS can boot from MBR-style disks, and in some cases (depends on the manufacturer), they can also boot from GPT. However, as per the UEFI specification, the disk should have a GPT partition table.
This MSDN article describes it well: