{
  "slug": "additional-sense-code-qualifier",
  "term": "Additional sense code qualifier",
  "aliases": [
    "ASCQ",
    "SCSI ASCQ"
  ],
  "definition": "The additional sense code qualifier (ASCQ) is an eight-bit SCSI sense-data field interpreted with the ASC to identify a more specific condition.",
  "note": "A qualifier has meaning within its ASC pair, not as an independent error code. [t10-asc] Record the response format and available length alongside the pair; a decoder's default zero is not evidence that an absent byte was returned as zero. [linux-sense]",
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "related": [
    "scsi",
    "scsi-check-condition",
    "scsi-sense-key",
    "additional-sense-code"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-13",
  "citations": [
    {
      "id": "t10-asc",
      "title": "T10: Additional sense data and ASC/ASCQ lookup tables",
      "url": "https://www.t10.org/lists/2asc.htm",
      "accessed": "2026-10-13"
    },
    {
      "id": "linux-sense",
      "title": "Linux v6.12: scsi_normalize_sense, fixed and descriptor field extraction",
      "url": "https://github.com/torvalds/linux/blob/v6.12/drivers/scsi/scsi_common.c",
      "accessed": "2026-10-13"
    },
    {
      "id": "hesela-sense",
      "title": "Media error or link error? SCSI sense codes and Linux ATA logs",
      "url": "https://hesela.com/analyses/scsi-sense-kernel-log-signatures/",
      "accessed": "2026-10-13"
    }
  ]
}