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On 12/9/24 13:47, Michael Schwingen wrote:
> On 2024-12-09, The Natural Philosopher  wrote:
>>> I was surprised you'd use MTBF for a component which is expected to
>>> steadily deteriorate due to wear and tear.
>>>
>>> I though MTBF was more a random failure thing.
>>>
>> No it isnt that at all.
>
> MTBF is a measure for the rate of failures *during normal lifetime* - ie.
>
> 1 / failure rate
>
> It is *not* the lifetime of a component. MTBF is a measure for failures
> during the flat part of the bathtub curve. Failures due to end of lifetime
> (like normal, not-premature wearout on a fan) are not part of MTBF.
>

Thanks Michael, very instructive. That clears up my misunderstanding. So
MTBF is a random type, rather than a wear type thing. You just have to
assume bits are replaced before they get old.

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