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BIOS is the Basic Input Output System that lives on the motherboard. The BIOS determines how the computer acts before any software is loaded, and in newer motherboards it determines how hardware appears to the operating system. BIOS is what allows a computer to boot. If the bios does not understand how to read from a piece of hardware, you can not boot from it. BIOS determines configuration for motherboard resources and provides the informatiotn about available resources to the operating system. BIOS may contain software to encrypt drives or hold a component necessary for decryption. BIOS may require the entry of a password before boot to help prevent unauthorized use. BIOS may hold unique information to identify the computer.

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