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When the IDD completes all the specified self-diagnosis tests normally, it reports a GOOD status.
On the other hand, when an error is detected in any of the specified self-diagnosis tests, a CHECK
CONDITION status is reported and information related to the detected error is shown in the sense
data. For example, when an error is detected in the controller function test, the type of error is
shown by HARDWARE ERROR [=4] in the sense key, and the sense code/sub-sense codes show
"Diagnostic failure on component 'nn' [=40-nn]." (nn is the code in the range X '80' to X 'FF,'
which shows the type of error. This code is a Fujitsu unique definition for the purpose of analysis
when there is a failure, and its meaning is not released to the public. The user should present the
value displayed in this sense data as repair information to the Fujitsu representative.)
Furthermore, error recovery processing when diagnostic tests (seek tests and write/read/data
comparison tests) related to the disk drive are executed are in accordance with the mode set in the
MODE SELECT command's parameters (Page code 1: Read/Write Error Recovery parameter,
Page code 21: Additional Error Recovery parameter), except in the following special cases.
Special cases of MODE SELECT parameters during a self-diagnosis test are as shown below
•
The AWRE, ARRE and TB flags are not applied.
•
The PER and DTE flags are as shown in Table 3.4.
Table 3.4
PER DTE
0
0
The diagnostic test continues when error recovery is successful. The contents of
recovered errors are not reported. When an error which cannot be recovered
from is detected, the diagnostic test terminates at that point with an error.
0
1
1
0
The diagnostic test continues when error recovery is successful. When an error
which cannot be recovered from is detected, the diagnostic test terminates at that
point with an error. Even when all the detected errors have been recovered, a
CHECK CONDITION status (RECOVERED ERROR [=1]) is reported after the
series of diagnostic tests is completed and the sense data show the contents of the
last error to be successfully recovered from.
1
1
When error recovery is successful, or even when error recovery is impossible, the
diagnostic test is terminated with an error at the point when the permitted error
recovery processing is completed and a CHECK CONDITION status is reported.
The sense data show the contents of the detected error.
Note:
When "1" is specified in the "SelfTest (self test)" bit in this command, the command
execution results are reported by the status byte and the sense data. Therefore, even if the
RECEIVE DIAGNOSTIC RESULTS command is executed after this command, the self-
diagnosis test execution results are not reported as response data.
Remark:
The error recovery control flag is valid only for PER. Therefore, the only error recovery
flag combination that is actually executed in the above self-diagnosis tests is the (PER,
DTE) = (1, 0) combination.
3 - 114
Error Recovery Control Flags during the Self-diagnosis Test
Diagnostic test operation
– – – – – (Setting prohibited) – – – –
C141-E039-01EN
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