Refind boot manager youtube
If CSM is enabled in the UEFI, the UEFI will generate CSM boot entries for all drives. The UEFI specification has support for legacy BIOS booting with its Compatibility Support Module (CSM). The applications can be launched by adding a boot entry to the NVRAM or from the UEFI shell. Each vendor can store its files in the EFI system partition under the /EFI/ vendor_name folder.
These applications are usually stored as files in the EFI system partition. boot loaders, boot managers, UEFI shell, etc. UEFI implementations also support ISO-9660 for optical discs. The UEFI specification mandates support for the FAT12, FAT16, and FAT32 file systems (see UEFI specification version 2.9, section 13.3.1.1), but any conformant vendor can optionally add support for additional filesystems for example, HFS+ or APFS in some Apple's firmwares.
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UEFI does not launch any boot code from the Master Boot Record (MBR) whether it exists or not, instead booting relies on boot entries in the NVRAM. The Unified Extensible Firmware Interface has support for reading both the partition table as well as file systems. Originally created for the IBM PC to handle hardware initialization and the boot process, it has been replaced progressively since 2010 by the UEFI which does not suffer from the same technical limitations. Tip: The words BIOS and (U)EFI are often used instead of firmware BIOSĪ BIOS or Basic Input-Output System is in most cases stored in a flash memory in the motherboard itself and independent of the system storage.