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This article will explain in detail what the gpt format refers to. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Gpt refers to the globally unique identification partition table, which is the globally unique identification disk partition table format; it is part of the Extensible firmware Interface (EFI) standard and is used to replace the master boot record (MBR) partition table in BIOS systems that uses 32bits to store logical block address and size information.

The global unique identification partition table (GUID Partition Table, abbreviation: GPT) refers to the globally unique identification disk partition table format. It is used to replace the master boot record (MBR) partition table in the BIOS system in which logical block address and size information is stored in 32bits.

In the MBR hard disk, the partition information is stored directly in the master boot record (MBR) (the system's boot program is also stored in the master boot record). However, in the GPT hard disk, the location information of the partition table is stored in the GPT header. However, for compatibility reasons, the first sector of the hard disk is still used as the MBR, followed by the GPT header.

Like modern MBR, GPT uses logical block addresses (LBA) instead of early CHS addressing. The traditional MBR information is stored in the LBA 0GPT header and stored in LBA 1, followed by the partition table itself. The 64-bit Windows operating system uses 16384 bytes (or 32 sectors) as the GPT partition table, and the following LBA 34 is the start of the first partition on the hard disk.

Apple once warned: [3] "Don't assume that all devices have a block size of 512 bytes." Some modern storage devices such as solid state drives may use 1024-byte blocks, and some magneto-optical discs (MO) may use 2048-byte sectors (but magneto-optical discs are usually not partitioned). Some hard drive manufacturers are planning to produce hard drives with 4096 bytes per sector, but as of early 2010, the new hard drives used firmware to disguise the operating system as a sector. [4]

Macs that use Intel architecture also use GPT.

To reduce the risk of corruption of the partition table, GPT saves a copy of the partition table at the end of the hard drive.

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