MTBF unit
MTBF unit was the measurement of the reliability of a hardware component. MTBF was an abbreviation for "mean time between failures".

In 2367, when Doctor Leah Brahms was reviewing modifications to the engines of the , she noted that Chief Engineer Geordi La Forge had completely charted a new swap-out schedule for main component replacements. La Forge responded to her observation by stating he found Starfleet estimates of MTBF units were unrealistic. He made a new schedule based on observation and experience. ()

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Measurements