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7.2 Operation Confirmation
7.2.1 Operation test
When the host computer is processing data, the disk drive monitors disk drive
operation errors including data, command, and seek errors. The host is notified of
the error that the disk drive detected and the user is notified of its result.
The user may notice intermittent and indefinite failures such as overlong execution
time, abnormal noise, abnormal odor, or failures in particular processes.
The failure reported in the operation test will need further investigation. To
ascertain the cause of the disk drive failure reported, the disk drive can be
replaced. Failures in the operation test are often not caused by the host system.
For example, not having enough power supply reserve, a loose cable connection,
no timing and mechanical reserves, or relationship with other systems.
In normal operation, the disk drive itself or the host determines the processing
(return or halt) following the detected failure state.
To troubleshoot the failure reported in the test at this level, accurately reproduce
the condition that caused the failure. Then, by replacing the disk drive, try to
separate the fault from the other sections of the disk drive host system.
7.2.2 Diagnostic test
The diagnostic test is used to separate a confirmed disk drive failure to a disk drive
subassembly or to check the disk drive performance. A test of this level usually
includes a specific disk drive function or concentrated execution of a group of
functions. The test is usually performed by a factory engineer and not where the
failure was reported. The disk drive is tested using another host computer or test
equipment.
To troubleshoot the disk drive failure in the diagnostic test, the engineer will
reproduce the failure condition. The engineer then isolates the failure to a
subassembly or part of the disk drive.
The procedures used in a test of this level great depend on the test equipment used.
It is beyond the range of this manual.
C141-E280
7.2 Operation Confirmation
7-11
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Troubleshooting
