What is UEFI based BIOS vs MBR (Legacy)?

Learn about what UEFI BIOS is and how it acts as a boot loader for a system. How do the various forms of BIOS like UEFI and MBR Legacy differ?

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[vicmac]

I have a passion for motherboard firmwares. I could write a L. Rossmann style rant novel how much I hate modern firmwares. But nobody would read it. The microcontroller chips used to be 4 or 8 mb and updates in kilobytes. Including both bios and uefi. Even with modern UI. Nowadays the chips are fully capable computers. Biggest BIOS/UEFI update I've seen was 89 mb without modern UI available for intel 8th gen. They're still missing lots of features which would make everyday computer lives much much easier. 'Coreboot configurator' style configurator with keyboard and mouse configuration (laptops) options should be a standard to get OS independent personal configs.

In desktop, the chips used to be non-soldered. That should be still so.

Sorry for this long rant. This was the shortest I could do. Maybe one I'll write a book just to make myself less angry.

[handlehaggler]

So your picture made me think you are going to explain bootloader, bootstrap and the bcd/bcde thing

And hopefully mention something about the order in which these sit. What module or partition relies or is dependent on another partition and etc

[Drottninggatan]

Here is a question: Some graphics cards are UEFI. How does that relate to UEFI BIOS?
Sometimes when you put another GPU into your laptop it will show no picture, not even on startup. That is alleged to relate to if the GPU is UEFI capable or not. It can not depend on windows or windows drivers or if windows is running in UEFI, because there is no picture before windows has started.
Even with quite new GPUs some are UEFI and some are not.

[hoffyc.h]

I had a ton of problem with my last summer second hand bought mid range 2021 Gaming PC, and had to reinstall windows 10 Pro on it in the end of last summer, and had really bad knowledge of anything. So I by mistake installed windows in MBR and has A 1TB m.2 boot driver, the PC works fine now, but have installed and set my PC up good now, but having my SSD in MBR instead of UFEI bothers me a bit, but I don't know if it's okey to have a gaming PC for years in MBR, but I don't wanna do the hazzle to reinstall everything again.
I know you can convert and maybe not lose any Data but i'm a guy can anything go wrong so will it go wrong so i'm afriad to do the convert as well, so my last question is MBR okey in 2023 to use all the time? :)

[usertlsdca]

I upgraded to W10 from my old FX 8350 cpu and noticed W10 does not like the UEFI boot from power up. So much, I had many BSODs but that is part of Google too with BSODs. When I reinstalled from Home to Pro W10, it notified me to change my boot route to OS. Nver noticed and thought my ASUS logo intro from boot was normal. I was wondering why I didnt have the windows logo like others, lol..

[ColdFlameEcosystem]

Please, I want a tutorial of making a UEFI Bootloader with Graphics protocol

[usertlsdca]

Legacy interface is an old school Macintosh look.

[slalomsker]

There is no such thing as UEFI BIOS. Only legacy mode in UEFI. You also mixed up MBR and GPT.