Re: dng image file corrupting
Re: dng image file corrupting
- Subject: Re: dng image file corrupting
- From: Graeme Gill <email@hidden>
- Date: Sun, 07 Apr 2013 11:00:13 +1000
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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