SCSI Additional Sense Data

SCSI Additional Sense Data takes the form of two value encoded bytes in the sense data, typically returned by the REQUEST SENSE command. The additional sense code (ASC) byte indicates information about the error exception reported in the sense key field. The additional sense code qualifier (ASCQ) indicates detailed information related to the additional sense code. See the clause describing the REQUEST SENSE command in the SCSI Primary Commands - 4 (SPC-4) draft standard (or later) for more information about sense data.

Descriptions of the assigned ASC and ASCQ values and their coded meanings are organized in tables that are sorted numerically based on the ASC/ASCQ values or alphabetically based on the text describing the error or exception indicated by the ASC/ASCQ pair. An explanation of the ASC/ASCQ table format is available if you are unfamiliar with these tables.

Hyper-Text Format Tables

The ASC/ASCQ tables are available in hyper-text format. Included in the hyper-text are text links that speed the process of locating ASC/ASCQ values of interest. The following hyper-text ASC/ASCQ tables are available:

Plain Text Format Tables

The ASC/ASCQ tables are available in an ASCII plain text format. The ASCII plain text is suitable for FTP transfer to your computer, printing, and local editor inspection. The following ASCII plain text ASC/ASCQ tables are available:

CAUTION: The information presented at this Web site is not officially part of the SCSI standard. Conflicts between the information presented at this Web site and the applicable SCSI standard or standards must be resolved by formal action of the INCITS T10 Technical Committee. Until such resolution occurs, the applicable written SCSI standard or standards apply.

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