Re: dng image file corrupting
Re: dng image file corrupting
- Subject: Re: dng image file corrupting
- From: Spinnaker Photo Imaging Center <email@hidden>
- Date: Sat, 06 Apr 2013 21:49:10 -0700
Graeme, do you use IBM compatible, PC?
Davod
Millers' Photography L.L.C.
David Miller, member
Spinnaker Photo Imaging Center
email@hidden
360 739 2826
On Apr 6, 2013, at 6:00 PM, Graeme Gill <email@hidden> wrote:
> Millers' Photography L.L.C. wrote:
>> I am finding dng image files are corrupting.
>> Ideas and suggestions are welcome,
>
> This may or may not be related to your problem, but a thing that
> rather flies below most peoples radar is that modern popular computer
> systems have vast amounts of RAM that is not error checked (parity)
> or error corrected (ECC). This means that random bit flips caused
> by alpha rays will happily crash your programs or corrupt your files
> if the files are loaded into RAM and then written back to disk.
>
> [As a H/W engineer designing computer RAM systems in the 80 & 90's,
> I was rather horrified to learn this. But reducing system costs
> seems to have won the day over reliability.]
>
> These bit flip events are relatively rare with modern RAM chips, but
> they do happen (a symptom I occasionally saw was a program that
> would suddenly start crashing for no reason, even after re-loading
> it. A system re-start would cure the problem. What had happened was
> that the system disk cache had become corrupted).
>
> Intel reserves ECC for its server chipsets (although there is the
> occassional exception in the laptop space), so you are pretty much
> stuck with the problem if you choose Intel. AMD has ECC support on
> many of its chipsets, so it is just a matter of locating and fitting
> ECC capable RAM SIMs and enabling ECC in the BIOS. I certainly sleep
> a bit easier now that I switched to an AMD CPU/chipset, and have ECC
> protecting my data when it's in RAM.
>
> Graeme Gill.
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