Our in depth look at UEFI and how to disable it for dual booting explains further. It does this by checking that any code executed at boot has a valid digital signature. Secure Boot ensures that malware does not exploit a computer's boot process. This last feature is a method of securing the PC. UEFI overcomes these, adding, for example, support for drives of 2.2TB or larger, 32-bit and 64-bit modes, and Secure Boot. An industry-wide standard agreed upon by chip manufacturers Intel and AMD, along with Microsoft and PC manufacturers, UEFI improves on BIOS.ĭue to having its roots in the 1980s IBM-compatibles era of personal computers, BIOS has some limitations. The Unified Extensible Firmware Interface (UEFI) specification was introduced to supplant BIOS. No battery is necessary on these systems, but you'll often find it anyway.
Meanwhile, modern UEFI motherboards store settings on flash memory or on the computer's hard disk drive. They store the BIOS settings in non-volatile memory, which means that the settings don't need constant power to be saved.
Modern computers don't use CMOS RAM anymore. CMOS RAM requires a battery the settings would otherwise be lost when the PC was switched off.
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