Note: The bytes referenced above can be seen only by scrolling down within the data block.

The data is contained in bytes 3C, 3D, and 3E. Byte 3E is the sense key. Byte 3D is the Additional Sense Code (ASC). Byte 3C is the Additional Sense Code Qualifier (ASCQ). In the example above, the sense key (byte 3E) is 03, the ASC (byte 3D) is 0c, and the ASCQ (byte 3C) is 00. As per Table 1, this error co-relates to a write error. If the sense code is not listed below, or for more information on any of these codes, please contact the hardware vendor. SCSI sense codes are not an official standard but many of these errors tend to be the same for many different types of devices.

Table 1
 

Sense Key	ASC	ASCQ	Description
00	00	00	No additional sense code
No sense	00	01	Unexpected FM encountered
	00	02	End of medium (EOM) encountered
	00	03	SetMark encountered
	00	04	Beginning of medium (BOM) encountered
	00	05	EOD encountered
	5D	00	Tape alert failure prediction threshold exceeded
	5D	FF	False exception condition
01	00	17	Clean requested
Recovered error	0A	00	Error log overflow
	0A	80	Error log generated
	37	00	Rounded parameter
	3B	08	Repositioning error
	44	C1	EEPROM copy 1 area bad
	44	C2	EEPROM copy 2 area bad
	47	00	SCSI parity error
	48	00	IDE message received
	51	00	Erase failure
	53	01	Unload tape failure
	5B	02	Log counter at maximum
	80	02	Cleaning requested (use cleaning tape)
	80	03	Soft error exceeds threshold
02	04	00	Unit not ready, cause nonreportable
Not ready	04	01	Unit not ready, calibration in process
	04	02	Unit not ready, load command needed
	04	03	Unit not ready, manual intervention needed
	30	02	Incompatible format
	30	03	Unit not ready, incompatible cleaning media installed
	3A	00	Media not present
	3A	80	Media not present, VU cartridge missing
	5A	01	Operator media removal request
03	00	00	Medium error
Medium error	04	02	Unit not ready, load command needed
	0C	00	Write error (possible tape medium problem, cleaning tape needed)
	11	00	Unrecovered read error
	11	08	Unrecovered read error, incomplete block read
	14	00	Recorded entity not found (logical DLT block not found)
	15	02	Position error detected by read of medium
	30	00	Cannot read medium
	30	01	Unknown format
	3B	00	Sequential positioning error
	3B	08	Repositioning error
	51	00	Erase failure
	80	00	Calibration error (use cleaning tape)
	80	01	Cleaning required (use cleaning tape)
	81	00	Directory read error (use cleaning tape)
04	08	00	LUN communication failure
Hardware error	08	01	LUN communication timeout failure
	0C	80	Write SCSI FIFO CRC error
	11	80	Read SCSI FIFO CRC error
	11	81	Block port detected EDC error
	11	82	Block port detected record CRC error
	15	01	Random mechanical positioning error
	21	01	Invalid element address
	3B	08	Repositioning error
	3B	0D	Media destination element full
	3B	0E	Media source element empty
	40	80	Diagnostic/POST failure, ROM EDC error
	40	81	Diagnostic/POST failure, RAM failure
	40	82	Diagnostic/POST failure, bad drive status
	40	83	Diagnostic/POST failure, loader diagnostics failure
	40	84	Diagnostic/POST failure, POST soft failure
	44	00	Internal target failure
	44	83	SCSI chip gross error/illegal command status
	44	84	Unexpected/unexplained residue count in transfer register
	44	85	Immediate data transfer timeout
	44	86	Insufficient CDB bytes
	44	87	Disconnect/SDP sequence failed
	44	88	Bus DMA transfer timeout
	44	8A	Over temperature condition
	44	C1	EEPROM copy 1 area bad
	44	C2	EEPROM copy 2 area bad
	44	C3	Both EEPROM copy areas bad
	47	00	SCSI parity error
	48	00	IDE message received
	51	00	Erase failure
	53	00	Media load/eject failure
	53	01	Unload tape failure
05	1A	00	Parameter list length error
Illegal request	20	00	Illegal opcode
	20	81	Illegal command while in recovery mode
	21	01	Invalid element address (media changer)
	24	00	Invalid CDB field
	24	81	Invalid mode on write buffer
	24	82	Media in drive
	24	84	Insufficient resources
	24	86	Invalid offset
	24	87	Invalid size
	24	89	Image data over limit
	24	8B	Image/personality is bad
	24	8C	Not immediate command
	24	8D	Bad drive/server image EDC
	24	8E	Invalid personality for code update (CUP)
	24	8F	Bad controller image EDC
	25	00	Illegal LUN
	26	00	Parameter list error, invalid field
	26	01	Parameter list error, parameter not supplied
	26	02	Parameter list error, parameter value invalid
	30	00	Incompatible medium (cannot read medium)
	39	00	Saving parameters not supported
	3B	0D	Media destination element full
	3B	0E	Media source element empty
	3D	00	Invalid bits in ID message
	53	02	Media removal prevented
	82	00	Not allowed if not at BOT
06	28	00	Not ready to ready transition
Unit attention	29	00	Reset occurred
	2A	01	Mode parameters changed
	2A	02	Log parameters changed
	3F	01	Microcode has been changed
	5B	01	Log threshold condition met
07	27	80
Data protected	27	82
08	00	05	EOD encountered
Blank check	08	00	LUN communications failure
09	XX	YY	Code update event (where XX = drive revision code and YY = controller revision code)
Code update
0A	0A	00	Error log overflow
	0A	80	Error log generated
0B	2F	00	Commands cleared by another initiator
Command aborted	43	00	Message error
	44	80	Unexpected selection interrupt
	44	82	Command complete sequence failure
	44	83	SCSI chip, gross error/illegal command status
	44	84	Unexpected/unexplained residue count in transfer register
	44	87	Disconnect sequence failure
	44	89	Command cleared from queue without other
	45	00	Select/reselect failure
	47	00	SCSI parity error
	48	00	IDE message error
	49	00	Invalid message error
	4B	00	Data phase error
	4E	00	Overlapped commands attempted
	83	00	Can not read/write data transfer