Decode using the following format:
0210401H 9231 (Error Code example)
0210PLSC 9XYY (decoding key)
---+|||| ||-+
||||| || |
||||| || + Additional sense code (00-5D are valid codes
||||| || see 'Additional Sense Code' table
||||| ||
||||| |+-- Sense key (see 'Sense Key' table)
||||| +--- Unit reference code. (Important, see note below)
|||||
||||+----- Capacity code of the specific fixed disk being tested
|||+------ Micro Channel slot of the SCSI adapter
||+------- LUN (logical unit number; on fixed disks)
|+-------- PUN (physical unit number, that is, SCSI ID=4)
+--------- Non removal fixed disk media (hard file)
The information contained in the first 8 characters is not error specific
and points only to the device under test. The Return Code is more
specific to the failure and may be decoded by referring first to the Sense
Key and then the Additional Sense Codes. Some of the Sense Key and
Additional Sense Codes represent a probable software problem. Operating
System software has the capability of receiving this information and using
it to provide detailed error information to the user, or to execute error
recovery processes. The use of this capability varies by design from one
operating system to another.
***** Note *****
If the Unit Reference Code is other than a '9' the Sense Key and
Additional Sense Codes referred to in the Tables have DIFFERENT meanings
and SHOULD NOT be used.
Sense Key
Code Interpretation
0 No Sense Key. No sense key information is available
1 Recovered Error. The last command completed successfully with
recovery action performed by the device
2 Not Ready. The logical unit addressed cannot be selected
3 Media Error. The command terminated with a non recoverable
error condition caused by either an error in the recorded data,
or a flaw in the media (disk)
4 Hardware Error. The device detected a non recoverable hardware
error either while performing a command or during a
diagnostic test
5 Illegal Request. There was an illegal parameter in the command
descriptor block or an additional parameter was supplied as
data. This is a probable software error
6 Unit Attention. The device has been reset by one of the
following:
a Power-On sequence;
a bus Device Reset message;
a hard reset;
removable media was removed/inserted;
or a Mode Select command was issued
7-A N/A. Unused
B Aborted Command. The device aborted the command
C-D N/A. Unused
E Miscompare. Indicates that the source data did not match the
data read from the media on a Write Verify or Verify command
F N/A. Unused
Additional Sense Code
Code Interpretation
00 No additional sense information is available
01 No index or sector was found. Low-level format the drive.
If the diagnostics then run error-free, the drive is
serviceable.
02 Seek is incomplete. The time required to physically move the
head/arm assembly or switch heads exceeds the specified
limits. Probably a hardware failure.
03 Write fault. Occurs when a track position or write circuit
fault is detected during a write operation. This is not
always a hardware failure. A physical jolt to the drive
during a write operation could cause this situation. An
isolated occurrence does not indicate a hardware failure.
04 Drive is not ready. Occurs when the spindle motor speed is
out of specification, or if the device requires a
motor start command and the command was not issued.
Perform Power-Off-On and retest the drive.
09 Track following error. Occurs when the actuator position
cannot be maintained over a given track. This is probably
a hardware failure.
0C Write error. A failure occurred during write operation
(probably with Verify on) and auto-reallocation of the
sector failed or is not supported on this type of drive.
A low-level format should be performed, or the sector
re-assigned. If the diagnostics then run error-free, the
drive is serviceable.
10 ID CRC. A read error was detected in the ID field of the
sector during a read or write operation. A low-level
format should be performed. If the diagnostics then run
error-free, the fixed disk is serviceable.
11 Unrecoverable read error. Occurred in the data field of the
sector that could not be corrected. The sector should be
re-written or re-assigned, or a low-level format should
be performed. If the diagnostics then run error-free, the
drive is serviceable.
14 No record found. Occurs when the SCSI device cannot find the
requested record. Low-level format the drive, then
re-test. If no error occurs, the drive is serviceable.
15 Seek positioning error. Occurs when the positioning of the
head/arm assembly to a new location failed. This is
probably a hardware failure.
16 Data synchronization mark error. Occurs when the sync. byte
at the data field cannot be detected. A low-level format
should be performed. If diagnostics then run error-free,
the fixed disk is serviceable.
17 Recovered read data without ECC. Occurs when the ECC check
bytes, calculated from the read data during the first
read operation, do not match the ECC check bytes appended
to the data field, but did match on a subsequent read
operation. This can result from a minor media defect.
Rewrite or re-assign the sector, or low-level format the
drive and re-run diagnostics. If no error is detected,
the fixed disk is serviceable.
18 Recovered read data with ECC. Occurs when the ECC check
bytes, calculated from the read data during the first
read operation, do not match the ECC check bytes appended
to the data field, but had ECC correction applied on a
subsequent read. Possibly a minor media defect. Rewrite
or re-assign the sector, or low-level format the drive
and re-run diagnostics. If no error is detected, the
fixed disk is serviceable.
19 Defect list error. Occurs when a data error is detected
while reading the manufacturing defect list or while
reading or writing the grown defect list. Ignore the
grown defect list, low-level format the drive and
re-test. If no error occurs, the drive is serviceable.
1A Parameter list length error. Occurs when the command
operation code received by the device is invalid.
Probably a software problem.
1B Synchronous data transfer error. An error occurred during
data transmission. Check cable connections, cable
termination, and for excessive cable length, then re-test.
1D Compare error. Occurs when the data read from the media does
not match the data written to the media on a Write Verify
command. Probably a hardware problem.
20 Invalid command operation code. Occurs when the command
operation code received by the device is not supported.
21 Illegal logical block address. Occurs when the logical block
address requested is outside the range supported by the
device. Probably a software problem.
24 Illegal field in the Command Descriptor Block (CDB). Occurs
when the device detects unexpected values in any field of
the CDB. Probably a software problem.
25 Illegal LUN. Occurs when the LUN field in the CDB is not
supported. Probably a software problem.
26 Illegal field in the parameter list. Occurs when the device
detects values other than expected in any field of the
parameter list. Probably a software problem.
28 Removable medium changed. (Not applicable for fixed disk
drives.)
29 Power-On Reset or Bus Device Reset. Indicates that the
device (drive) was reset. A reset may have been issued
by software or may caused by defective hardware.
2A Mode select parameters changed. This error is not a hardware
failure, but could be due to either software or
diagnostic code problems.
31 Media format corrupted. The format of the media appears to
be corrupted, or was interrupted (for example, by a
Power-Down or a Reset) prior to completion of a Format
Unit command. The Format Unit command should be re-issued
and must complete successfully for this error condition
to be removed.
32 No defect spare location available. Indicates that the
Reassign Block command cannot complete successfully
because all available spare sectors have been used.
Ignore the grown defect list, low-level format the drive
and re-test. If no error occurs, the drive is serviceable.
3F Operating condition on the device has been changed. This is
probably a software error.
40 Component failure. The drive self-test diagnostics detected
a failure (hardware) in the device.
43 Message reject error. Occurs when an inappropriate or
unexpected Message Reject is received from the SCSI
Adapter/A or the SCSI Adapter/A rejects a message twice.
44 Internal controller error. Occurs when an internal micro-
processor detects incorrect status or receives an illegal
request from the device electronics. This is a hardware
failure.
45 Select/Re-Select Failed. Occurs when the SCSI Adapter
fails to respond to a re-selection within 250
milliseconds after the device gains bus arbitration. The
re-selection is attempted a second time before setting
'Select/Re-Select Failed' status.
47 SCSI interface parity error. Occurs when the device detects
incorrect parity on the SCSI data bus (cable). Check
cable connections, cable termination, and cable length
(maximum 6 meters, or approximately 20 feet).
48 Initiator-detected error. Occurs when the SCSI Adapter/A
detects an error, sends a message to retry, detects the
error again, and sends the retry message a second time.
This is probably a hardware problem.
49 Inappropriate/illegal message. Occurs when the SCSI
Adapter/A sends a message that either is not supported or
is not in a logical sequence. Probably a software error.
4C Logical Unit failed self-configuration. This is probably a
hardware failure in the device being tested.
4E Overlapped commands attempted. This is probably a software
error.
5D Predictive failure analysis threshold reached. When a
predetermined number of errors is reached, this error
message will prompt the user to take action to prevent
loss of data. Backup the data and have the fixed disk
serviced or replaced, as appropriate.
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