On 11/12/2018 20:56, Martin Gregorie wrote:

> [*] 1,000,000 hours MTBF has to be pure sales-inspired hype since no disk
> drive has ever been test run for anything like that: hard disks were only
> invented 65 years ago while a million hours is a little over 114 years!

They are generally calculated from populations, accelerated testing
and/or predictions.
It is a mean figure usually with a normal distribution and so it can
fail at 10 hours with a massively low probability and the disk could
still have an MTBF of 1M hrs.

It may be sales hype but that does not mean that it is untrue.
It also does not mean that it is true.

Andy

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