SMART causes the disk drive to continually monitor performance/failure data and to save information for user inquiry. Diagnostic capabilities (test and report results) may also be supported. Parameters reported reflect information such as defective sectors, operation retries, etc that can be used to determine drive health and to predict future failure. Operating parameters such as hours on and drive start stops can also be monitored in order to support maintenance philosophies that replace aging drives whether they are failing or not.
No, I do not know how Quantum expects you to pronounce "S.M.A.R.T."
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