What is gpt format

gpt refers to "Globally Unique Identification Partition Table", which is a globally unique identification disk partition table format; it is part of the Extensible Firmware Interface (EFI) standard and is used to replace the 32bits in BIOS systems. Master boot record (MBR) partition table to store logical block address and size information.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Globally uniquely identified partition table (GUID Partition Table, abbreviation: GPT) refers to the globally uniquely identified disk partition table format. is used to replace the Master Boot Record (MBR) partition table in the BIOS system that uses 32 bits to store logical block address and size information.

In an MBR hard disk, partition information is directly stored in the master boot record (MBR) (the system boot program is also stored in the master boot record). But in a GPT hard drive, 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 MBR, followed by the GPT header.

Like modern MBR, GPT also uses logical block addresses (LBA) to replace the early CHS addressing method. Traditional MBR information is stored in LBA 0, GPT header is stored in LBA 1, and then the partition table itself. 64-bit Windows operating systems use 16,384 bytes (or 32 sectors) as the GPT partition table, and the following LBA 34 is the beginning of the first partition on the hard disk.

Apple once warned: [3] "Do not 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 disks ( MO) may use 2048-byte sectors (but magneto-optical disks are usually not partitioned). Some hard drive manufacturers are planning to produce 4096-byte sector drives, but as of early 2010, this new drive uses firmware to disguise 512-byte sectors to the operating system. [4]

Apple computers using Intel architecture also use GPT.

In order to reduce the risk of partition table damage, GPT saves a copy of the partition table at the end of the hard disk.

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