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What is GPT (GUID Partition Table) Partition ?

What is a GPT Partition?

GPT stands for GUID Partition Table. Just like MBR, it also manages the creation and organization of partitions on the HDD. GPT uses UEFI firmware, and it also stores disk information, such as partitions, sizes, and other essential data, just like MBR does in sector one. However, GPT uses sector two because sector one gets reserved for MBR and BIOS compatibility. In GPT technical terms, MBR sector #1 (LBA 1) is LBA 0 for GPT, and GPT is sector 1 (LBA 1).

The data stored in the GPT header includes drive information in the form of a GUID partition table. The GUID consists of details on drives, partitions, storage sizes, boot information, and other essential data related to boot and functionality.

The GUID Partition Table stored in LBA 1 of the HDD includes information on the following:

  • MBR data
  • GPT data
  • Partition entries data
  • Secondary (a.k.a. backup) GPT data.

GPT’s Advantages

GPT stands for GUID Partition Table. It’s a new standard that’s gradually replacing MBR. It’s associated with UEFI, which replaces the clunky old BIOS with something more modern. GPT, in turn, replaces the clunky old MBR partitioning system with something more modern. It’s called GUID Partition Table because every partition on your drive has a “globally unique identifier,” or GUID—a random string so long that every GPT partition on earth likely has its own unique identifier.

GPT doesn’t suffer from MBR’s limits. GPT-based drives can be much larger, with size limits dependent on the operating system and its file systems. GPT also allows for a nearly unlimited number of partitions. Again, the limit here will be your operating system—Windows allows up to 128 partitions on a GPT drive, and you don’t have to create an extended partition to make them work.

On an MBR disk, the partitioning and boot data is stored in one place. If this data is overwritten or corrupted, you’re in trouble. In contrast, GPT stores multiple copies of this data across the disk, so it’s much more robust and can recover if the data is corrupted.


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