The Master Boot Record (MBR) is a special boot sector at the very beginning of partitioned computer storage devices. Examples of such devices are built-in or removable hard disks, SSDs, flash drives. The MBR concept was officially introduced in DOS version 1983 of the PC in 2.0 and has been running on used BIOS personal computers even today.
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A GUID partition table (GPT) is a standard for arranging partition tables for physical computer storage devices, such as hard disk drives or SSDs, that uses universally unique identifiers (UUIDs), also known as GUIDs, to clearly distinguish partitions on a storage device. . GPT is part of the Unified Extensible Firmware Interface (UEFI) standard.
With the help of the CSM (Compatibility Support Module) in Hungarian, the modern UEFI-based motherboards of PCs are backward compatible with the old BIOS-based motherboards, which booted from hard disks with MBR partitions. So, thanks to the CSM module, UEFI motherboards can also boot operating systems from these older drives.
UEFI (Unified Extensible Firmware Interface) is a specification that defines the interface between the operating system and the platform firmware. UEFI replaces the previous Basic Input Output System (BIOS) that was originally found on all IBM PC-compatible personal computers, but most UEFI implementations still in use today also support legacy BIOS features through the Compatibility Support Module (CSM).