I need to decide whether it is more straightforward to create a bootable Ubuntu drive in UEFI or standard BIOS. I do not want to create or install it through any more ambiguous route than necessary because I have experience with accidentally installing one on the other's environment.

  • You either boot to the media in UEFI more or you don't. If there is a EFI partition on the disk that is a good indication. The title does not really match the body of your question.
    – Ramhound
    Jul 29 '15 at 12:19
  • How do I access UEFI mode booting from Windows 10? And is this specific to Ubuntu's boot disk or is this universally UEFI? Jul 29 '15 at 12:22
  • If you installed Windows 10 on a GPT partition then you will be booting in UEFI mode. What does your question have to do with a Ubuntu?
    – Ramhound
    Jul 29 '15 at 12:26
  • UEFI-booting from within Windows 10. I know there is a specific way to make the next reboot pick up installation media in UEFI mode. Bad phrasing on my part in my last comment. Jul 29 '15 at 12:28
  • So you want to access your UEFI firmware menu? You do so exactly how you did it in Windows 8.x. Fix your phrasing...You keep calling it "UEFI mode" which isn't really a thing.
    – Ramhound
    Jul 29 '15 at 12:52

Open the System Information Utility (Win Key + "R" > "msinfo32" > OK)

In system summary, look for "BIOS MODE".

Alternatively, check Disk manager. If you have a partition on your disk for "EFI system partition" then you are using UEFI. If you only have system reserved and C:, its probably BIOS.

Hope one of these helps

  • is it only for win10? I can't see this in Win7 Mar 16 '18 at 10:28

You can also use Windows Panther directory logs:

type C:\Windows\Panther\setupact.log|find /i "Detected boot environment"

Extracted from: http://www.sysadmit.com/2017/04/windows-uefi-o-legacy-bios.html

  • My Windows 10 Version 1903 does not have this file: C:\Windows\Panther\setupact.log Jan 29 '20 at 11:22

Open the file C:/Windwos/Panther/setupact.log (.log is maybe hidden)

Then search for (Strg+F) Detected boot environment:

If you find

Detected boot environment: BIOS

then its BIOS, if you find

Detected boot environment: EFI

then its UEFI.

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