Which function does BIOS NOT perform during startup?

The BIOS (Basic Input/Output System) is responsible for several critical tasks during the computer startup process. One of the key functions performed by the BIOS is loading the operating system; it does this by locating the bootloader on the storage device. Additionally, the BIOS scans for attached hardware components to ensure they are present and functioning correctly, and it initializes system settings, including configurations for storage devices, memory, and other peripherals.

However, performing device encryption is not one of the functions of the BIOS. Encryption is typically handled by the operating system or specialized software and relies on technologies and procedures beyond the scope of what BIOS can manage. While BIOS may have security features related to password protection and basic integrity checks, it does not engage in the actual encryption of data on storage devices, which is a more complex process requiring dedicated software. Thus, the correct answer clearly delineates a function outside the typical duties of the BIOS during startup.