Can't find option to activate legacy boot mode on Asus EFI BIOS

windows-10 uefi windows-7

Solution 1:

In some ASUS firmwares (e.g. "Aptio"), there is no such global choice – all available boot options are merged into a single menu (press Esc to open the boot menu one-time).

BIOS-mode boot entries always describe a specific disk rather than a specific OS (since they only boot the MBR 'bootcode' and don't know the OS name, unlike UEFI-mode boot entries which do). Of course, it's not impossible that an UEFI boot entry would be named after a disk, but that's rather unlikely...

For removable media, UEFI-mode entries also have an UEFI: prefix, while BIOS-mode entries either don't (as in your case) or are prefixed with BIOS: (on some other computers).

Therefore your options are:

  • SAMSUMG HD – BIOS
  • Windows Boot Manager – UEFI (stored in NVRAM)
  • General USB Flash Disk – BIOS
  • UEFI: General USB Flash Disk – UEFI (autodetected from removable drive)

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