Annualized failure rate

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Annualized failure rate, or short AFR is the reciprocal of the mean time between failure (MTBF) expressed in years and percent.

For example, a typical disk drive MTBF number may be 1,200,000 hours. One year has 8,760 hours.

[\frac=136.9863 years ]

then take the reciprocal of 136.9863 years

[\frac\times 100\%=0.73\%]

You can expect about 0.73 percent of the population of disk drives to fail in the average year.

See also