Master Boot Record (MBR) is a special boot sector at the very beginning of partitioned computer storage. Examples of such devices are built-in or removable hard drives, SSDs, and flash drives. The MBR concept was officially introduced in PC DOS 1983 in 2.0 and has been running on PCs with BIOS since then.
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The GUID Partition Table (GPT) is a standard for arranging partition tables for physical computer storage devices, such as hard drives or SSDs, which uses universally unique identifiers (also known as GUIDs) to identify partitions on storage devices. . GPT is part of the Unified Extensible Firmware Interface (UEFI) standard.
UEFI (Unified Extensible Firmware Interface) is a specification that defines the interface between the operating system and the platform firmware. UEFI replaces the previous BIOS (Basic Input Output System) originally found on all IBM PC-compatible PCs, but most UEFI implementations that are still in use today support legacy BIOS services using the Compatibility Support Module (CSM).