MTBF (mean time between failures) - TechTarget
https://www.techtarget.com/whatis/definition/MTBF-mean-time-between-failures
WEBMTBF (mean time between failures) is a measure of how reliable a hardware product or component is. For most components, the measure is typically in thousands or even tens of thousands of hours between failures. For example, a hard disk drive may have a mean time between failures of 300,000 hours.
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