Re: Pi-FAN for RPi4 with 4 (instead of 3) cables?

On 12/9/24 13:47, Michael Schwingen wrote:

On 2024-12-09, The Natural Philosopher <tnp@invalid.invalid> 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.