{
  "status": "shipping",
  "advantages": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-21",
  "slug": "nvme-dulbe",
  "term": "NVMe DULBE",
  "aliases": [
    "Deallocated or Unwritten Logical Block Error Enable"
  ],
  "definition": "NVMe DULBE is the Error Recovery feature bit that enables a namespace's deallocated or unwritten logical-block error.",
  "note": "It is bit 16 of Error Recovery, feature 05h. Namespace support is reported separately by NSFEAT bit 2. Support does not establish enablement; an absent current-setting capture leaves policy unknown. [nvme-1-4a]",
  "limitations": [
    {
      "text": "An error-policy setting does not report which LBAs are allocated and is not a sanitization result.",
      "citationIds": [
        "nvme-1-4a"
      ]
    }
  ],
  "related": [
    "nvme-dlfeat",
    "deallocated-read-behavior",
    "namespace-nvme",
    "discard"
  ],
  "citations": [
    {
      "id": "nvme-1-4a",
      "title": "NVM Express 1.4a: Figure 247, Figure 282 and section 6.7.1.1",
      "url": "https://nvmexpress.org/wp-content/uploads/NVM-Express-1_4a-2020.03.09-Ratified.pdf",
      "accessed": "2026-10-21"
    },
    {
      "id": "libnvme-fields",
      "title": "libnvme v1.13: namespace feature and DLFEAT field definitions",
      "url": "https://raw.githubusercontent.com/linux-nvme/libnvme/v1.13/src/nvme/types.h",
      "accessed": "2026-10-21"
    },
    {
      "id": "hesela-discard",
      "title": "Hesela: interpreting deallocation fields",
      "url": "https://hesela.com/analyses/discard-is-not-zeroing/#nvme-fields",
      "accessed": "2026-10-21"
    }
  ],
  "provenance": [
    "NVMe 1.4a section 5.21.1.5 and Figure 282; logical policy, not observed device behavior."
  ]
}