additional-sense-code-qualifier · shipping · also ASCQ, SCSI ASCQ

Additional sense code qualifier

The additional sense code qualifier (ASCQ) is an eight-bit SCSI sense-data field interpreted with the ASC to identify a more specific condition.

Related Observatory article: Additional sense code qualifier on hesela.com

A qualifier has meaning within its ASC pair, not as an independent error code. [1] 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. [2]

Relations

related

scsi, scsi-check-condition, scsi-sense-key, additional-sense-code

Citations

1. T10: Additional sense data and ASC/ASCQ lookup tables (accessed 2026-10-13)
2. Linux v6.12: scsi_normalize_sense, fixed and descriptor field extraction (accessed 2026-10-13)
3. Media error or link error? SCSI sense codes and Linux ATA logs (accessed 2026-10-13)

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