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  2. Mean time between failures - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_failures

    It is recommended to use Mean time to failure (MTTF) instead of MTBF in cases where a system is replaced after a failure ("non-repairable system"), since MTBF denotes time between failures in a system which can be repaired. [1] MTTFd is an extension of MTTF, and is only concerned about failures which would result in a dangerous condition. It ...

  3. Failure rate - Wikipedia

    en.wikipedia.org/wiki/Failure_rate

    In practice, the mean time between failures (MTBF, 1/λ) is often reported instead of the failure rate. This is valid and useful if the failure rate may be assumed constant – often used for complex units / systems, electronics – and is a general agreement in some reliability standards (Military and Aerospace).

  4. Mean time between outages - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_outages

    In a system the mean time between ... where MTBF is the nonredundant mean time between failures and FFAS is the fraction of failures for which the failed equipment ...

  5. Reliability prediction for electronic components - Wikipedia

    en.wikipedia.org/wiki/Reliability_prediction_for...

    MTBF (mean operating time between failures) applies to equipment that is going to be repaired and returned to service, MTTF (mean time to failure) applies to parts that will be thrown away on failing. During the ‘useful life period’ assuming a constant failure rate, MTBF is the inverse of the failure rate and the terms can be used ...

  6. Reliability, availability and serviceability - Wikipedia

    en.wikipedia.org/wiki/Reliability,_availability...

    Reliability can be characterized in terms of mean time between failures (MTBF), with reliability = exp(−t/MTBF). [5] Availability means the probability that a system is operational at a given time, i.e. the amount of time a device is actually operating as the percentage of total time it should be operating. High-availability systems may ...

  7. Software reliability testing - Wikipedia

    en.wikipedia.org/wiki/Software_reliability_testing

    Software reliability is the probability that software will work properly in a specified environment and for a given amount of time. Using the following formula, the probability of failure is calculated by testing a sample of all available input states. Mean Time Between Failure(MTBF)=Mean Time To Failure(MTTF)+ Mean Time To Repair(MTTR)

  8. Annualized failure rate - Wikipedia

    en.wikipedia.org/wiki/Annualized_failure_rate

    Annualized failure rate (AFR) gives the estimated probability that a device or component will fail during a full year of use. It is a relation between the mean time between failure ( MTBF ) and the hours that a number of devices are run per year.

  9. Hard disk drive failure - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_failure

    The mean time between failures (MTBF) of SATA drives is usually specified to be about 1 million hours. Some drives such as Western Digital Raptor have rated 1.4 million hours MTBF, [22] while SAS/FC drives are rated for upwards of 1.6 million hours. [23]

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