![]() It has trouble initializing multiple hardware devices at once, which leads to a slower boot process when initializing all the hardware interfaces and devices on a modern PC. The BIOS must run in 16-bit processor mode, and only has 1 MB of space to execute in. That limitation is due to the way the BIOS's Master Boot Record system works. 8 TB drives are now common, and a computer with a BIOS can't boot from them. ![]() It can only boot from drives of 2.1 TB or less. The traditional BIOS still has serious limitations. ![]() You'll have to look up what different sequences of beeps mean in the computer's manual. If something is wrong, you'll see an error message or hear a cryptic series of beep codes. It checks to ensure your hardware configuration is valid and working properly. The BIOS goes through a POST, or Power-On Self Test, before booting your operating system. When you boot your computer, the BIOS will configure your PC with the saved settings. When you save a setting, it's saved to the memory on your motherboard itself. You can access this screen by pressing a specific key-different on different computers, but often Esc, F2, F10, or Delete-while the computer boots. Settings like your computer's hardware configuration, system time, and boot order are located here. You can configure various settings in the BIOS setup screen. The BIOS loads when your computer starts up, and the BIOS is responsible for waking up your computer's hardware components, ensures they're functioning properly, and then runs the bootloader that boots Windows or whatever other operating system you have installed. It's low-level software that resides in a chip on your computer's motherboard. BIOS is short for Basic Input-Output system.
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