You demonstrate a common misunderstanding of MTBF with the operational lifetime of a device. The MTBF of a device is simply the average number of operational hours between failures. So if your company has 1,000 of these SSDs, you would expect one failure every 1,250 hours (or roughly one ever 52 days). However, the working lifetime of the SSD might only be 10 years. What this means is that after 10 years roughly 70 of these SSDs would have failed, but it might be that by that they've reached the end of their operational lifetime and they start failing at a much higher rate.
In fact, MTBF tells you nothing directly about the operational lifetime of a device. That has to be expressed separately, and it might be constrained by something other than the passage of time - in the case of SSDs, that measure might be the number of write cycles, whilst with HDDs powered-up time might be the relevant figure. With a car engine, it might be total mileage.
Of course it's right to be sceptical about MTBFs as these are not independently reported (and at the beginning of the devices life, they are extrapolated.
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Misunderstanding MTBF
@DJO
You demonstrate a common misunderstanding of MTBF with the operational lifetime of a device. The MTBF of a device is simply the average number of operational hours between failures. So if your company has 1,000 of these SSDs, you would expect one failure every 1,250 hours (or roughly one ever 52 days). However, the working lifetime of the SSD might only be 10 years. What this means is that after 10 years roughly 70 of these SSDs would have failed, but it might be that by that they've reached the end of their operational lifetime and they start failing at a much higher rate.
In fact, MTBF tells you nothing directly about the operational lifetime of a device. That has to be expressed separately, and it might be constrained by something other than the passage of time - in the case of SSDs, that measure might be the number of write cycles, whilst with HDDs powered-up time might be the relevant figure. With a car engine, it might be total mileage.
Of course it's right to be sceptical about MTBFs as these are not independently reported (and at the beginning of the devices life, they are extrapolated.