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Appendix. Compatibility notes
ECC testing
When a Marathon 2250 or Marathon 1680 performs hardware-based
ECC error correction on-the-fly, the drive does not report an ECC error.
This allows ECC correction without degrading drive performance. Some
older drive diagnostic programs test ECC features by creating small data
errors and then checking to see if they are reported. Such tests, when
run on these drives, may incorrectly report an ECC detection failure
because the drive hardware corrects the data automatically, avoiding the
error rather than reporting it. Such a report does not indicate a drive
malfunction.
Marathon 2250 and Marathon 1680 Product Manual 37