Graeme, do you use IBM compatible, PC? Davod Millers' Photography L.L.C. David Miller, member Spinnaker Photo Imaging Center spinnakerphotoimagingcenter@dnmillerphoto.com 360 739 2826 On Apr 6, 2013, at 6:00 PM, Graeme Gill <graeme2@argyllcms.com> 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. _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/spinnakerphotoimagin...
This email sent to spinnakerphotoimagingcenter@dnmillerphoto.com