BIOS---mbr,uefi---GPT understanding

BIOS---MBR

  BIOSis the English "basic Input Output System" abbreviation, literal translation, the Chinese name is "basic input and outputsystem". In fact, it is a set of cured toComputerinsideMotherboardpreviousROMChipon theprogram, it holdsComputerThe most important basic input and output programs,System Settingsinformation, post-boot self-test programs and system self-start programs. Its main function is toComputerprovide the lowest, most directHardwaresettings and controls. Today, this system has becomevirusTrojan Horse's goals. Once this system is destroyed, its consequencesUnthinkable.

    MBR, the master boot record, is the boot sector at the forefront of the drive when the hard disk or removable disk partition is on the IBM compatible machine. The MBR concept was only available after the 1983 PC DOS 2.0 support HDD. MBR describes the logical partitioning information, including the file system and how it is organized. In addition, the MBR also contains executable code for the computer to load the operating system in the second phase of startup or a boot record (VBR) that connects each partition. This MBR code is often referred to as the bootloader.

because the MBR partition table has a maximum addressable storage space of only 2Tb (2 + x512 bytes). Therefore, in the case of large hard disks, the MBR partitioning method is gradually replaced by the GUID partition table.

UEFI---GPT

new UEFI, full name "Unified Extensible Firmware Interface" (Unified extensible Firmware Interface), is a standard that describes the type interface in detail. This interface is used for the operating system automatically loads from the pre-boot operating environment onto an operating system. architecture , interfaces and services proposed standards. Its primary purpose is to provide a set of correctly specified startup services that are consistent across all platforms before the OS is loaded, and are seen as a successor to the BIOS with a history of nearly more than 20 years.

The GPT globally unique identity partition table (GUID Partition table, abbreviation: GPT) refers to the globally unique label disk partition table format. It is part of the Extensible Firmware Interface (EFI) standard (BIOS used by Intel to replace a personal computer) and is used to replace the master boot record (MBR) partition table with 32bits to store logical block address and size information in the BIOS system.

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BIOS---mbr,uefi---GPT understanding