Key Code Qualifier: Difference between revisions

Revision as of 18:20, 27 March 2018

Latest revision as of 22:16, 9 December 2024

(3 intermediate revisions by 2 users not shown)

Line 1:

{{Short description|Type of SCSI error code}}

{{redirect|KCQ|the radio station in Saginaw, Michigan|WKCQ}}

'''Key Code Qualifier''' is an error-code returned by a [[SCSI]] device.

When a SCSI [[SCSI target|target]] device returns a [[SCSI check condition|check condition]] in response to a [[SCSI command|command]], the [[SCSI initiator|initiator]] usually then issues a [[SCSI Request Sense Command|SCSI Request Sense command]]. This process is part of a SCSI protocol called [[SCSI contingent allegiance condition|Contingent Allegiance Condition]]. The target will respond to the Request Sense command with a set of [[SCSI Request Sense Command|SCSI sense data]] which includes three fields giving increasing levels of detail about the error:

*K - sense key - 4 bits, (byte 2 of Fixed sense data format)

*C - additional sense code (ASC) - 8 bits, (byte 12 of Fixed sense data format)

Line 208 ⟶ 209:

|5||21||00||Illegal Request - LBA out of range

|-

|5||24||00||Illegal Request - invalid field in [[SCSI CDB|CDB]] (Command Descriptor Block)

|-

|5||25||00||Illegal Request - invalid LUN