Re: SD card corruption

On 7/13/2023 3:02 PM, Bob Bishop wrote:
>
> What’s the environment like? SD cards really don’t like being run hot for instance. Are there radios or other electrical noise nearby?

Its a messy retail environment, but not too hot. The design of the APUs 
have excellent passive cooling and I monitor the CPU temp at a few 
hundred sites and have a good baseline. There is very little variation 
and failures dont seem to correlate with the few hot outliers. CPU is 
usually around 50C. (https://www.pcengines.ch/apucool.htm). The recent 
fail site the weekly avg was 49.9C with almost no variation / spikes

Could exposure to a burst of intense em scramble the SD card ?  I would 
think other devices would be impacted if that were the case. Whats odd 
is that I am testing one of the returned cards right now. I wiped it, 
filled it with 15GB of a few random files and am continuously 
checksuming the files and they are fine. I would think that if the SD 
card failed, it would continue to fail. Hence, I am just trying to 
better understand what causes this. The SD card hardware layer is all 
"black box" to me


     ---Mike