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Key Code Qualifier is a computer term used to describe an error-code returned by a SCSI device.
When a SCSI target device returns a check condition in response to a command, the initiator usually then issues a SCSI Request Sense command. This process is part of a SCSI protocol called Contingent Allegiance Condition. The target will respond to the Request Sense command with a set of SCSI sense data which includes three fields giving increasing levels of detail about the error:
- K - sense key - 4 bits
- C - additional sense code (ASC) - 8 bits
- Q - additional sense code qualifier (ASCQ) - 8 bits
List of common SCSI KCQs
Category Key ASC ASCQ Error Condition No 0 00 00 No error Sense 0 5D 00 No sense - PFA threshold reached Soft 1 01 00 Recovered Write error - no index Error 1 02 00 Recovered no seek completion 1 03 00 Recovered Write error - write fault 1 09 00 Track following error 1 0B 01 Temperature warning 1 0C 01 Recovered Write error with auto-realloc - reallocated 1 0C 03 Recovered Write error - recommend reassign 1 12 01 Recovered data without ECC using prev logical block ID 1 12 02 Recovered data with ECC using prev logical block ID 1 14 01 Recovered Record Not Found 1 16 00 Recovered Write error - Data Sync Mark Error 1 16 01 Recovered Write error - Data Sync Error - data rewritten 1 16 02 Recovered Write error - Data Sync Error - recommend rewrite 1 16 03 Recovered Write error - Data Sync Error - data auto-reallocated 1 16 04 Recovered Write error - Data Sync Error - recommend reassignment 1 17 00 Recovered data with no error correction applied 1 17 01 Recovered Read error - with retries 1 17 02 Recovered data using positive offset 1 17 03 Recovered data using negative offset 1 17 05 Recovered data using previous logical block ID 1 17 06 Recovered Read error - without ECC, auto reallocated 1 17 07 Recovered Read error - without ECC, recommend reassign 1 17 08 Recovered Read error - without ECC, recommend rewrite 1 17 09 Recovered Read error - without ECC, data rewritten 1 18 00 Recovered Read error - with ECC 1 18 01 Recovered data with ECC and retries 1 18 02 Recovered Read error - with ECC, auto reallocated 1 18 05 Recovered Read error - with ECC, recommend reassign 1 18 06 Recovered data using ECC and offsets 1 18 07 Recovered Read error - with ECC, data rewritten 1 1C 00 Defect List not found 1 1C 01 Primary defect list not found 1 1C 02 Grown defect list not found 1 1F 00 Partial defect list transferred 1 44 00 Internal target failure 1 5D 00 PFA threshold reached 1 5D FF PFA test warning 1 81 00 Internal logic failure Not 2 04 00 Not Ready - start motor failed Ready 2 04 01 Not Ready - becoming ready 2 04 02 Not Ready - need initialise command (start unit) 2 04 03 Not Ready - manual intervention required 2 04 04 Not Ready - format in progress 2 04 09 Not Ready - self-test in progress 2 31 00 Not Ready - medium format corrupted 2 31 01 Not Ready - format command failed 2 35 02 Not Ready - enclosure services unavailable 2 40 80 Diagnostic Failure - bring-up fail or degraded mode 2 40 81 Diagnostic Failure - Hard Disk Controller 2 40 85 Diagnostic Failure - RAM microcode not loaded 2 40 90 Diagnostic Failure - RRO Calibration 2 40 91 Diagnostic Failure - Channel Calibration 2 40 92 Diagnostic Failure - Head Load 2 40 93 Diagnostic Failure - Write AE 2 40 94 Diagnostic Failure - 12V over current 2 40 95 Diagnostic Failure - Other spindle failure 2 40 B0 Diagnostic Failure - self-reset 2 4C 00 Diagnostic Failure - config not loaded Medium 3 03 00 Medium Error - write fault Error 3 0C FF Medium Error - write recovery time limit exceeded 3 10 00 Medium Error - ID CRC error 3 11 00 Medium Error - unrecovered read error 3 11 01 Medium Error - read retries exhausted 3 11 02 Medium Error - error too long to correct 3 11 04 Medium Error - unrecovered read error - auto re-alloc failed 3 11 0B Medium Error - unrecovered read error - recommend reassign 3 11 FF Medium Error - read recovery time limit exceeded 3 14 01 Medium Error - record not found 3 16 00 Medium Error - Data Sync Mark error 3 16 04 Medium Error - Data Sync Error - recommend reassign 3 19 00 Medium Error - defect list error 3 19 01 Medium Error - defect list not available 3 19 02 Medium Error - defect list error in primary list 3 19 03 Medium Error - defect list error in grown list 3 19 0E Medium Error - fewer than 50% defect list copies 3 31 00 Medium Error - medium format corrupted 3 31 01 Medium Error - format command failed 3 80 00 Medium Error - data auto-reallocated Hardware 4 01 00 Hardware Error - no index or sector Error 4 02 00 Hardware Error - no seek complete 4 03 00 Hardware Error - write fault 4 09 00 Hardware Error - track following error 4 11 00 Hardware Error - unrecovered read error in reserved area 4 16 00 Hardware Error - Data Sync Mark error in reserved area 4 19 00 Hardware Error - defect list error 4 19 02 Hardware Error - defect list error in Primary List 4 19 03 Hardware Error - defect list error in Grown List 4 31 00 Hardware Error - reassign failed 4 32 00 Hardware Error - no defect spare available 4 35 01 Hardware Error - unsupported enclosure function 4 35 02 Hardware Error - enclosure services unavailable 4 35 03 Hardware Error - enclosure services transfer failure 4 35 04 Hardware Error - enclosure services refused 4 3E 03 Hardware Error - self-test failed 4 3E 04 Hardware Error - unable to update self-test 4 40 80 Hardware Error - Degrade Mode. Diagnostic Fail. 4 40 81 Hardware Error - Degrade Mode. H/W Error 4 40 85 Hardware Error - Degrade Mode. RAM microcode not loaded. 4 40 90 Hardware Error - seek test failure 4 40 A0 Hardware Error - read/write test failure 4 40 B0 Hardware Error - device self-reset 4 40 D0 Hardware Error - component mismatch 4 44 00 Hardware Error - internal target failure 4 81 00 Hardware Error - internal logic error 4 82 00 Hardware Error - command timeout Illegal 5 1A 00 Illegal Request - parm list length error Request 5 20 00 Illegal Request - invalid/unsupported command code 5 21 00 Illegal Request - LBA out of range 5 24 00 Illegal Request - invalid field in CDB 5 25 00 Illegal Request - invalid LUN 5 26 00 Illegal Request - invalid fields in parm list 5 26 01 Illegal Request - parameter not supported 5 26 02 Illegal Request - invalid parm value 5 26 03 Illegal Request - invalid field parameter - threshold parameter 5 26 04 Illegal Request - invalid release of persistent reservation 5 26 97 Illegal Request - invalid field parameter - TMS firmware tag 5 26 98 Illegal Request - invalid field parameter - check sum 5 26 99 Illegal Request - invalid field parameter - firmware tag 5 2C 00 Illegal Request - command sequence error 5 35 01 Illegal Request - unsupported enclosure function 5 49 00 Illegal Request - invalid message 5 55 00 Illegal Request - system resource failure 5 55 01 Illegal Request - system buffer full 5 55 04 Illegal Request - Insufficient Registration Resources Unit 6 28 00 Unit Attention - not-ready to ready transition (format complete) Attention 6 29 00 Unit Attention - POR or device reset occurred 6 29 01 Unit Attention - POR occurred 6 29 02 Unit Attention - SCSI bus reset occurred 6 29 03 Unit Attention - TARGET RESET occurred 6 29 04 Unit Attention - self-initiated-reset occurred 6 29 05 Unit Attention - transceiver mode change to SE 6 29 06 Unit Attention - transceiver mode change to LVD 6 2A 00 Unit Attention - parameters changed 6 2A 01 Unit Attention - mode parameters changed 6 2A 02 Unit Attention - log select parms changed 6 2A 03 Unit Attention - Reservations pre-empted 6 2A 04 Unit Attention - Reservations released 6 2A 05 Unit Attention - Registrations pre-empted 6 2F 00 Unit Attention - commands cleared by another initiator 6 3F 00 Unit Attention - target operating conditions have changed 6 3F 01 Unit Attention - microcode changed 6 3F 02 Unit Attention - changed operating definition 6 3F 03 Unit Attention - inquiry parameters changed 6 3F 05 Unit Attention - device identifier changed 6 3F 90 Unit Attention - invalid APM parameters 6 3F 91 Unit Attention - world-wide name mismatch 6 5D 00 Unit Attention - PFA threshold reached 6 5D FF Unit Attention - PFA threshold exceeded Write 7 27 00 Write Protect - command not allowed Protect Aborted B 00 00 Aborted Command - no additional sense code Command B 1B 00 Aborted Command - sync data transfer error (extra ACK) B 25 00 Aborted Command - unsupported LUN B 3F 0F Aborted Command - echo buffer overwritten B 43 00 Aborted Command - message reject error B 44 00 Aborted Command - internal target failure B 45 00 Aborted Command - Selection/Reselection failure B 47 00 Aborted Command - SCSI parity error B 48 00 Aborted Command - initiator-detected error message received B 49 00 Aborted Command - inappropriate/illegal message B 4B 00 Aborted Command - data phase error B 4E 00 Aborted Command - overlapped commands attempted B 4F 00 Aborted Command - due to loop initialisation Other E 1D 00 Miscompare - during verify byte check operation x 03 86 Write Fault Data Corruption x 05 00 Illegal request x 06 00 Unit attention x 07 00 Data protect x 08 00 LUN communication failure x 08 01 LUN communication timeout x 08 02 LUN communication parity error x 09 00 vendor specific sense key x 09 01 servo fault x 09 04 head select fault x 0A 00 error log overflow x 0B 00 aborted command x 0C 00 write error x 0C 02 write error - auto-realloc failed x 0E 00 data miscompare x 12 00 address mark not founf for ID field x 14 00 logical block not found x 15 00 random positioning error x 15 01 mechanical positioning error x 15 02 positioning error detected by read of medium x 27 00 write protected x 29 00 POR or bus reset occurred x 31 01 format failed x 31 91 format corrupted x 32 01 defect list update error x 32 02 no spares available x 35 01 unspecified enclosure services failure x 37 00 parameter rounded x 3D 00 invalid bits in identify message x 3E 00 LUN not self-configured yet x 40 01 DRAM parity error x 40 02 DRAM parity error x 42 00 power-on or self-test failure x 4C 00 LUN failed self-configuration x 5C 00 RPL status change x 5C 01 spindles synchronised x 5C 02 spindles not synchronised x 65 00 voltage fault x 80 00 general firmware error
"Key Code Qualifier"