{
  "slug": "unique-partition-guid",
  "term": "Unique partition GUID",
  "aliases": [
    "UniquePartitionGUID",
    "GPT partition UUID"
  ],
  "definition": "A unique partition GUID is the 128-bit identifier assigned to an individual GPT partition entry, distinct from its partition type GUID and the disk GUID.",
  "note": "UEFI names this field UniquePartitionGUID. Partitions sharing a purpose can share PartitionTypeGUID while retaining different individual identifiers; DiskGUID belongs to the disk header. [uefi]\n\nOn GPT, Linux PARTUUID= selects the partition identifier, not the filesystem UUID. [mount-identifiers] The sfdisk --part-uuid operation is separate from --part-type and --disk-id. [sfdisk-identifiers]\n\nFor GPT disk and partition copies, UEFI requires fresh disk and unique partition GUIDs; duplicate GUIDs can make selection indeterminate. Preserve byte-identical acquisition evidence separately from operational copies. [uefi]",
  "status": "shipping",
  "advantages": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-11-03",
  "limitations": [
    "An identifier does not verify the partition's payload.",
    "Byte-for-byte acquisition preserves recorded identifiers; retain that evidence separately from operational copies whose identifiers are changed."
  ],
  "related": [
    "filesystem-uuid",
    "partition-type-guid",
    "guid-partition-table"
  ],
  "citations": [
    {
      "id": "uefi",
      "title": "UEFI 2.10, chapter 5: GPT header and partition-entry identifiers",
      "url": "https://uefi.org/specs/UEFI/2.10/05_GUID_Partition_Table_Format.html",
      "accessed": "2026-11-03"
    },
    {
      "id": "mount-identifiers",
      "title": "util-linux v2.41 mount(8): filesystem and partition selectors",
      "url": "https://raw.githubusercontent.com/util-linux/util-linux/v2.41/sys-utils/mount.8.adoc",
      "accessed": "2026-11-03"
    },
    {
      "id": "sfdisk-identifiers",
      "title": "util-linux v2.41 sfdisk(8): partition type, partition UUID and disk ID",
      "url": "https://raw.githubusercontent.com/util-linux/util-linux/v2.41/disk-utils/sfdisk.8.adoc",
      "accessed": "2026-11-03"
    }
  ],
  "provenance": [
    "Identifier semantics from UEFI 2.10 chapter 5 and util-linux v2.41 manuals; no partition editing or native-device test."
  ]
}