HP StorageWorks 2000 Series Reference Manual page 201

4. Note any error counts displayed for these statistics.
SMART Event Count
I/O Timeout Count
No Response Count
Spin-up Retries
Media Errors
Non Media Errors
Bad Block Reassignments
Bad Block List Size
The number of SMART (Self-Monitoring Analysis and
Reporting Technology) events that the drive recorded.
These events are often used by the vendor to determine
the root cause of a drive failure. Some SMART events
may indicate imminent electromechanical failure.
The number of times the drive accepted an I/O request
but did not complete it in the required amount of time.
Excessive timeouts can indicate potential device failure
(media retries or soft, recoverable errors)
The number of times the drive failed to respond to an I/O
request. A high value can indicate that the drive is too
busy to respond to further requests.
The number of times the drive failed to start on power-up
or on a software request. Excessive spin-up retries can
indicate that a drive is close to failing.
The number of times the drive had to retry an I/O
operation because the media did not successfully
record/retrieve the data correctly.
The number of soft, recoverable errors that are not
associated with drive media.
The number of block reassignments that have taken place
since the drive was shipped from the vendor. A large
number of reallocations in a short period of time could
indicate a serious condition.
The number of blocks that have been deemed defective
either from the vendor or over time due to reallocation.