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(Windows tools like EasyBCD can help configure the Windows boot loader's boot manager features.) The Windows boot loader can also function as a boot manager, but it's more often configured to boot straight to Windows, so this functionality is less important - at least, when people set things up as Linux users generally do. GRUB, however, cannot directly launch a Windows kernel, so to boot Windows, GRUB passes control on to the Windows boot loader. GRUB presents a menu of options, like a boot manager but it can also directly boot a Linux kernel. Some programs, including GRUB, are both boot loaders and boot managers. This distinction is pretty simple and easy to understand, but there are some complicating factors that can make the difference seem rather blurry: A program that functions exclusively as a boot manager does not directly launch an OS kernel, although the boot loader it launches will do so.

Boot loaders are programs that load an OS kernel into memory and pass control to the kernel.It's important to understand the difference between two different tools: An EFI is a fundamentally new type of firmware, though, and if you think of it in BIOS terms, you're likely to apply a lot of BIOS assumptions to EFI that are flat-out wrong.Īnd this brings us to the distinction between boot loaders and boot managers, a common tripping point for sysadmins deploying multiple boot environments on their hardware stacks: Referring to to EFIs as "BIOSes," encourages thinking of EFIs in BIOS terms, as if an EFI were a simple add-on to a BIOS.

A common misconception on handling boot systems is how users and vendors often use the terms UEFI and BIOS interchangeably, and this shows in how such systems are often designed to handle conditions such as the Compatibility Support Module (CSM mode).