David Kirkby wrote:
>Someone had a disk failure, and asked the question "how do they get
>those huge MTBS's" or similar.
>
>I replied they (MTBF's which seem to vary between 500,00 and 1.4
>million hours) assume you replace the device at the end of a service
>life, which is typically 5 years. So it basically tells you the mean
>time you will have to wait for a failure if you throw lots of usable
>disks away.
>
It would be much better if they said: "Within the service life of this
product, the average odds are 500,000 to 1 against it failing in any
particular 1-hour period."
But even though this may be technically correct, it obviously takes no
account of Murphy's Law...
--
73 from Ian G/GM3SEK
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