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Computing (FOLDOC) dictionary
Mean Time Between Failures
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specification (MTBF, or "Mean Time Between Faults") The
average time (usually expressed in hours) that a component
works without failure. It is calculated by dividing the total
number of failures into the total number of operating hours
observed. The term can also mean the length of time a user
may reasonably expect a device or system to work before an
incapacitating fault occurs.