![]() ![]() Complicating discussion of BIOSes and EFIs is the fact that many people (and even most manufacturers) refer to EFIs as 'BIOSes,' probably because 'BIOS' is the more familiar term. ![]() Most EFIs include a component called the Compatibility Support Module (CSM), which enables an EFI to boot BIOS-mode OSes, but this feature can cause as many problems as it solves. ![]() The main duty of both the BIOS and the EFI is to start the boot process, but they do so in incompatible ways, so an OS needs to support whichever boot mode the computer supports. Firmware type - Old PCs used the Basic Input/Output System (BIOS), but new computers use the Extensible Firmware Interface (EFI) or its newer variant, the Unified EFI (UEFI).First, you're conflating two or three different things (perhaps because of poorly worded program messages): ![]()
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