Date: Thu, 13 Jul 2023 15:12:54 -0400 From: mike tancsa <mike@sentex.net> To: Bob Bishop <rb@gid.co.uk> Cc: freebsd-embedded <freebsd-embedded@FreeBSD.org> Subject: Re: SD card corruption Message-ID: <028a3f80-4d90-3368-6f51-ab8f77c56154@sentex.net> In-Reply-To: <C5FCB5FC-26A3-4DE1-A753-36A61FFC6E7D@gid.co.uk> References: <709521ba-5719-5f80-10bf-1de05d99d5c1@sentex.net> <C5FCB5FC-26A3-4DE1-A753-36A61FFC6E7D@gid.co.uk>
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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 ---Mikehome | help
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