These days I’m using an Apple Macbook Air. But back in those days when I had a Windows laptop, whenever I need to install fresh OS, I used to tweak BIOS settings. All I know about BIOS was, it’s a place to change the boot up disk. But there is lot to it.

BIOS Explained

BIOS stands for Basic Input Output System. It resides on computer mother board in ROM (read only memory). It is the first component to start immediately when you power on your PC. BIOS wakes up all the other hardware components and checks whether all of these components in working condition or not.

bios - basic input output system

If everything is ok, you will hear a single beep sound and it handovers the control the main software, which is your operating system. If you hear multiple beeps, it means something is wrong with your hardware. There may be problem with your RAM, processor or any other component.

BIOS simply acts as bridge between your hardware and software. That’s why we also call BIOS as motherboard firmware. Because it is the first to component to start, it’s also called boot up device. But there is problem with BIOS, it can’t handle storage more than 2TB.

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That’s why these days we are using UEFI, Unified Extensible Firmware Interface. It can handles millions of terabytes of data. Usually we find BIOS on Windows computers. Because Macbooks have EFI, Extensible Firmware Interface.

bios settings

You can control your PC hardware by tweaking BIOS settings. You can control CPU clock rate, RAM, startup disk. You can access BIOS settings by clicking F2 key immediately after you power on your computer. But I won’t recommend you accessing BIOS unless you are an expert or guided by an expert. Because if you change something on BIOS without knowing you may mess up with your PC.

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