{
  "slug": "nvme-critical-warning",
  "term": "NVMe Critical Warning",
  "aliases": [
    "Critical Warning",
    "critical_warning",
    "NVMe SMART warning bitmask"
  ],
  "definition": "NVMe Critical Warning is the SMART / Health Information log bitmask identifying controller warning conditions at the time the log is read.",
  "note": "NVMe Base 2.3 defines bits 0 through 6: spare below threshold, temperature threshold condition, degraded reliability, all media read-only, failed volatile-memory backup, PMR read-only or unreliable, and indeterminate personality state. Bit 7 is reserved. Bit 6 covers a failed personality-settings change when the previous personality could not be restored. NVMe 1.4a defined bits 0 through 5 with bits 6 and 7 reserved. [nvme-base-2-3-smart]",
  "status": "shipping",
  "advantages": [],
  "limitations": [
    {
      "text": "The mask is a current-state report, not a persistent event history; several flags can coexist, and a clear mask is not a guarantee against future failure.",
      "citationIds": [
        "nvme-base-2-3-smart",
        "nvme-1-4a-smart"
      ]
    }
  ],
  "related": [
    "nvme-smart-log",
    "nvme-available-spare",
    "nvme-media-data-integrity-errors"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "nvme-base-2-3-smart",
      "title": "NVM Express Base Specification 2.3, section 5.2.12.1.3, Figure 210, p. 214: Critical Warning",
      "url": "https://nvmexpress.org/wp-content/uploads/NVM-Express-Base-Specification-Revision-2.3-2025.08.01-Ratified.pdf",
      "accessed": "2026-10-14"
    },
    {
      "id": "nvme-1-4a-smart",
      "title": "NVM Express 1.4a, Figure 196, p. 122: historical six-bit Critical Warning layout",
      "url": "https://nvmexpress.org/wp-content/uploads/NVM-Express-1_4a-2020.03.09-Ratified.pdf",
      "accessed": "2026-10-14"
    }
  ],
  "updated": "2026-10-14"
}