The EFI uses the GPT where BIOS used the MBR. It was introduced as part of the EFI, or Extensible Firmware Interface, standard, created by Intel to replace the outlived BIOS, one of the last relics of the ancient IBM PC. The GPT, or the GUID Partition Table, is the standard format of partitioning tables on a physical hard disk. Note: The green block represents the Primary GPT, the blue block represents the secondary GPT With the entire World Wide Web being estimated to be about 0.5 ZB in size, the GPT partitioning system has the potential to stay around for a long time. With the rate of increase in hard drive capacity in computers, this limitation is significant enough for switching most of the older partitioning schemes to the GPT, which allocates 64 bits for logical block addresses, translating to 9.4 ZB(zeta-bytes, or 9.4*10²¹ bytes) of potential capacity. These limitations restrict the disk size of the machine to 2.2TB. It is a successor to many partition tables, such as MBR and APM, overcoming their limitations of using 32 bits for logical block addresses and a standard block size of 512 bytes. It was introduced by Intel in the late 1990's and has since become the standard layout of the partition table on a physical hard disk. The GUID Partition Table, known as the GPT, is a popular disk partitioning scheme used across most operating systems, including Windows and Unix-class operating systems such as Mac OS X. Contents GUID Partition Table (GPT) Introduction
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