Annualized failure rate (AFR) is the relation between the mean time between failure (MTBF) and the hours that a number of devices are run per year, expressed in percent. AFR does not specifically apply to a single component, but rather to a population of like components. AFR and MTBF as given by vendors may be population statistics that are not relevant to individual units.
Read more about Annualized Failure Rate: Hard Drives
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