List of common SCSI KCQs

Category	Key	ASC	ASCQ	Error Condition
No Sense	0	00	00	No error
	0	5D	00	No sense - PFA threshold reached
Soft Error	1	01	00	Recovered Write error - no index
	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
Not Ready	2	04	00	Not Ready - Cause not reportable.
	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	3A	00	Not Ready - medium not present
	2	3A	01	Not Ready - medium not present - tray closed
	2	3A	02	Not Ready - medium not present - tray open
	2	3A	03	Not Ready - medium not present - loadable
	2	3A	04	Not Ready - medium not present - medium auxiliary memory accessible
	2	4C	00	Diagnostic Failure - config not loaded
Medium Error	3	02	00	Medium Error - No Seek Complete
	3	03	00	Medium Error - write fault
	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	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
Hardware Error	4	01	00	Hardware Error - no index or sector
	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	15	01	Hardware Error - Mechanical positioning error
	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	32	00	Hardware Error - no defect spare available
	4	35	00	Hardware Error - enclosure services failure
	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	35	05	Hardware Error - enclosure services checksum error
	4	3E	00	Hardware Error - logical unit has not self configured yet
	4	3E	01	Hardware Error - logical unit failed
	4	3E	02	Hardware Error - timeout on logical unit
	4	3E	03	Hardware Error - self-test failed
	4	3E	04	Hardware Error - unable to update self-test log
	4	44	00	Hardware Error - internal target failure
Illegal Request	5	1A	00	Illegal Request - parm list length error
	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 (Command Descriptor Block)
	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	2C	00	Illegal Request - command sequence error
	5	35	01	Illegal Request - unsupported enclosure function
	5	49	00	Illegal Request - invalid message
	5	53	00	Illegal Request - media load or eject failed
	5	53	01	Illegal Request - unload tape failure
	5	53	02	Illegal Request - medium removal prevented
	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 Attention	6	28	00	Unit Attention - not-ready to ready transition (format complete)
	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	04	Unit Attention - component device attached
	6	3F	05	Unit Attention - device identifier changed
	6	3F	06	Unit Attention - redundancy group created or modified
	6	3F	07	Unit Attention - redundancy group deleted
	6	3F	08	Unit Attention - spare created or modified
	6	3F	09	Unit Attention - spare deleted
	6	3F	0A	Unit Attention - volume set created or modified
	6	3F	0B	Unit Attention - volume set deleted
	6	3F	0C	Unit Attention - volume set deassigned
	6	3F	0D	Unit Attention - volume set reassigned
	6	3F	0E	Unit Attention - reported LUNs data has changed
	6	3F	0F	Unit Attention - echo buffer overwritten
	6	3F	10	Unit Attention - medium loadable
	6	3F	11	Unit Attention - medium auxiliary memory accessible
	6	3F	12	Unit Attention - iSCSI IP address added
	6	3F	13	Unit Attention - iSCSI IP address removed
	6	3F	14	Unit Attention - iSCSI IP address changed
	6	3F	15	Unit Attention - inspect referrals sense descriptors
	6	3F	16	Unit Attention - microcode has been changed without reset
	6	3F	17	Unit Attention - zone transition to full
	6	3F	18	Unit Attention - bind completed
	6	3F	19	Unit Attention - bind redirected
	6	3F	1A	Unit Attention - subsidiary binding changed
	6	5D	00	Unit Attention - PFA threshold reached
Data Protect	7	20	02	Access Denied - No Access Rights
	7	27	00	Write Protect - command not allowed
Aborted Command	B	00	00	Aborted Command - no additional sense code
	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	55	03	Aborted Command - insufficient resources
	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	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	08	03	LUN communication CRC 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 found 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	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	x	Vendor specific
	x	x	≥80	Vendor specific