[Soekris] Life expectancy of a compact flash?

Philip subs at christiantena.net
Wed Apr 13 12:35:46 UTC 2011


Maybe logs could be written to a USB memory stick?

regards, Philip

Poul-Henning Kamp wrote:
> In message <4DA4D3C2.6060903 at bogus.com>, Joel Jaeggli writes:
>
> The answer is "it depends on so many factors that you do not and
> often cannot know, that you might as well give up predicting it at all."
>
> Unless you can get statistics out of the flash-adaptation layer in the
> card, there is no way to project what kind of state the flash array
> truely it is in.
>
> By the time you get the first bit of relevant information, in the
> shape of a read or write error, it is already time to throw the
> card out.
>
> If you use the card like it was intended, few writes of big files
> (photos in a camera) you will generally be fine.  If you do a lot
> of small writes you will generally not be.
>
> For 'big', 'small', 'few' and 'a lot', insert any random numbers
> you care to dream up, nobody knows the real numbers.  (A few of
> the high end manufacturers have data that is indicative, but they
> will only share them under NDA.)
>
> NanoBSD and Fifolog (both in FreeBSD) were both written to specifically
> avoid and when unavoidable, to optimize the write pattern for CF card
> longevity.
>
> Poul-Henning
>
>   



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