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.
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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.– RamhoundJul 29, 2015 at 12:19
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How do I access UEFI mode booting from Windows 10? And is this specific to Ubuntu's boot disk or is this universally UEFI?– Kamuela FrancoJul 29, 2015 at 12:22
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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?– RamhoundJul 29, 2015 at 12:26
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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.– Kamuela FrancoJul 29, 2015 at 12:28
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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.– RamhoundJul 29, 2015 at 12:52
3 Answers
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
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
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My Windows 10 Version 1903 does not have this file: C:\Windows\Panther\setupact.log Jan 29, 2020 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.