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I recently bought a new Dell notebook for my girlfriend and I want to know if the computer comes with a UEFI BIOS, unfortunately I didnt find any information in the manual or on Windows, is there some way to discover it?

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    What model laptop, and what is the current BIOS manufacturer, and revision info?
    – KCotreau
    Commented Jun 29, 2011 at 16:35
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    I dont have this information with me now, i will take a look next time I have the machine. However, i wish to learn how could I discover it this information on generic machines.
    – Diogo
    Commented Jun 29, 2011 at 17:09
  • @ Diogo, check my edit below.
    – Moab
    Commented Jun 29, 2011 at 17:38
  • doing a quick check, there's no documentation on if you can check on UEFI on WMIC. There's a pair of charecteristics that arn't on the official MS documentation i'm chasing down tho.
    – Journeyman Geek ♦
    Commented Jun 30, 2011 at 0:16
  • Is there any definite answer? That does not require connecting a hard drive and installing an OS (and recovery tools) ? A surefire way to check in the BIOS/(U)EFI setup tool? A simple boot program that queries the firmware and prints the results?
    – David Balažic
    Commented Jan 25, 2014 at 15:01

6 Answers 6

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There will be an extra UEFI partition on the hard drive, It may be hidden, if you can get a look at the files in the partition there will be some with an .efi file extension.

Different manufactures label the partitions differently, mine is labeled "HP_TOOLS"

I agree with William, all the new laptops I have seen in the last 2 years have UEFI

EDIT:

Another way may be to look in the C:\Windows\Boot folder for an EFI folder, it does not exist on non efi bios system's, You may have to unhide system or protected folders in folder options to see this folder.

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    UEFI has nothing to do with your HP recovery tools partition.
    – Breakthrough
    Commented Jun 29, 2011 at 17:07
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    I don't think the extra partition is required -- otherwise that would mean that you couldn't boot the machine without an extra hard disk.
    – user541686
    Commented Jun 30, 2011 at 3:01
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    The EFI System Partition is where the operating system boot loaders live on machines with EFI firmwares, Mehrdad.
    – JdeBP
    Commented Jun 30, 2011 at 11:56
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    Just about all UEFI systems have a BIOS emulation mode - they are "UEFI-capable" (as the question is asking), but will boot legacy bootloaders. The method described in this answer only applies if the system is set up to use UEFI boot, and is therefore inaccurate.
    – Bob
    Commented Feb 28, 2013 at 16:23
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    This should not be the accepted answer. @David Balažic answers the question that was asked.
    – FlexMcMurphy
    Commented Feb 27, 2021 at 12:48
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If you have Windows installed and usable, run the HWiNFO tool. Under the motherboard section (in the main window) it will say if the motherboard is UEFI capable or not (regardless of which mode the current Windows was installed or booted). If the HWiNFO utility displays 'UEFI', the motherboard is UEFI capable, otherwise it will display 'Legacy'. (Source)

Otherwise:

Put an Ubuntu 13.10 amd64 CD/DVD into the optical unit and on reset bring up the boot menu. If the PC has UEFI, the boot menu will present two items for the CD, one marked as "UEFI" and another "normal" one. If you select the normal one, you will get a graphical menu, while selecting the UEFI item will give you a textual menu. See this link for screenshots: https://askubuntu.com/questions/307508/how-to-tell-if-my-laptop-has-uefi/307930#307930

The other answers are incorrect. I have a UEFI PC with Windows 8.1, but no EFI partition, also the \Windows\Panther\setupact.log file has "Callback_BootEnvironmentDetect: Detected boot environment: BIOS".

Also, what if the HDD is inaccessible (it died and you replaced it with a new blank one)? Or you are assembling a new desktop PC and you haven't installed any OS yet?

There might be other tools to check the BIOS/UEFI type that might also work from USB sticks. I'll leave those to be an exercise for the reader...

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I am having problems confirming this information, but, I have personally not seen a laptop released within the last few years (non atom and latest technology) that was not EFI.

The best bit of advice I can give is to write down the BIOS version/serial/manufacturer and try to Google it and see what you can find out.

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    The best bit of advice is to install and run the HWiNFO tool. That will tell you if your computers motherboard "supports" UEFI which is what was asked.
    – FlexMcMurphy
    Commented Feb 27, 2021 at 12:52
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If EFI/UEFI meant extra partition on the HDD, this would imply that UEFI based machines can't boot diskless, and yet they can! You can't rely on that to determine if a machine is (U)EFI capable. Furthemore, HP_TOOLS does exist on non-UEFI based installations, it is created by some extra tool (ProtectTools, BIOSUPDate, Sparekey etc), so even if you do have HP_TOOLS on your HDD, it does not mean your PC is UEFI based.

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Follow Computer> C:(or your Local Disk)> Windows > Panther

In the folder look for the file called setupact. Open it and hit Ctrl+F to find the string:

Callback_BootEnvironmentDetect: Detected boot environment:

It will be either BIOS or UEFI.

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    Awesome. It seems to work for me. Mine is new dell inspiron 2320 aio. I had doubts as to mine may not have uefi. When i searched the file , as stated above, confirms my suspicion, it says BIOS. So 2 things are confirmed. 1) the above solution works and 2) Mine is bios. Thanks
    – bagavadhar
    Commented Jun 7, 2013 at 15:50
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    The value I have for this entry is BIOS, however I also have an EFI folder in my C:\Windows\Boot directory, which according to Moab indicates a UEFI. These contradict each other!
    – Bryan
    Commented Sep 4, 2013 at 15:18
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    This method is used to determine which boot environment is currently in use by Windows, right? It doesn't actually define the capabilities of your BIOS.
    – user1182988
    Commented Jan 17, 2021 at 18:27
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On Windows 10:

  1. Win+R
  2. type in cmd
    enter image description here
  3. in console type in msinfo32

  4. System info window should appear there should be BIOS Mode (if it's Legacy it's BIOS)

    enter image description here

On Linux:

The folder /sys/firmware/efi will exist you you are using UEFI.

Hope this saves you some time

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    The question was asking if the BIOS "supports" UEFI not if UEFI is currently being used. If I follow your answer I will incorrectly think my PC does not support UEFI when thanks to the answer from @David Balažic I now realise my BIOS IS UEFI capable even though it is currently in Legacy BIOS mode.
    – FlexMcMurphy
    Commented Feb 27, 2021 at 12:57
  • I believe @FlexMcMurphy is right, "system information" will tell if Windows is installed in UEFI mode or Legacy mode. It will not tell if BIOS is UEFI capable
    – wlf
    Commented May 31, 2021 at 2:09

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