partisjonstypeGUID

PartisjonstypeGUID, commonly called partition type GUID, is a 128-bit universally unique identifier used in the GUID Partition Table (GPT) to describe the intended purpose or type of a partition. Each GPT partition entry includes a Partition Type GUID (alongside the partition’s own Unique Partition GUID), and this value helps the operating system and partitioning tools determine how to treat the partition.

GPT is the modern disk partitioning scheme that replaces the older MBR and supports large disks and more partitions. The Partition Type GUIDs are defined by the GPT specification and by operating system vendors. They enable interoperability by allowing software to recognize a partition as, for example, an EFI System Partition, a Linux filesystem, or a Windows data partition, regardless of the partition’s filesystem content.

Common examples of well-known Partition Type GUIDs include:

- EFI System Partition: C12A7328-F81F-11D2-BA4B-00A0C93EC93B

- Microsoft Basic Data: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

- Microsoft Reserved: E3C9E316-0B5C-4DB8-817D-F92DF00215AE

- Linux filesystem data: 0FC63DAF-8483-4772-8E79-3D69D8477DE4

The Partition Type GUID is stored in the GPT metadata for each partition and is used by disk management utilities and operating systems to identify partition purpose, enable appropriate mounting or boot behavior, and ensure compatibility across tools and platforms. Users typically interact with these GUIDs indirectly through partitioning software such as gdisk, parted, Disk Management, or Disk Utility, rather than manipulating the GUIDs directly.