Post #2524463
2026-03-12 16:51 UTC
Replies (10)
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@Aaron_DeVries@mastodon.social 2026-03-12 17:31
@swope@mstdn.plus That's actually fascinating, I wonder why that is.
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@sudo200@layer8.space 2026-03-13 11:02
@swope@mstdn.plus @Aaron_DeVries@mastodon.social So, I guess we should store our testaments on an SSD while it is in liquid nitrogen
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@rachelplusplus@tech.lgbt 2026-03-13 12:48
@swope@mstdn.plus @Aaron_DeVries@mastodon.social I once saw a datasheet for an Intel SSD, which basically said it likes being run hot and stored cold, and that combination gave the longest data retention lifetime. Hot/hot, not so much. If I remember correctly, that's because higher temperatures make it easier for electrons to escape from the floating gates. Which is bad for data retention, but as long as the drive is powered on the firmware can handle that by re-writing the data occasionally. But it also means deliberate erasures are easier and cause less physical damage, so the SSD degrades slower if it's run hot. And after enough use, that matters more than the effect of temperature on the durability of any individual write.
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@gsnedders@glauca.space 2026-03-13 18:19
@swope@mstdn.plus @Aaron_DeVries@mastodon.social it’s inherent to all SSDs, to varying degrees, because it increases leakage from the cells — from memory offline storage at temperature is actually worse than online behaviour. you can certainly design SSDs to be better at high temperature, mostly by doing the normal things to decrease leakage, like single layer cells, decreasing density of the cells, increasing the number of error correction bits, etc. you can also just mitigate the online case in firmware, by increasing cell refresh frequency. such SSDs are manufactured, primarily for industrial, aviation, automobile, and similar applications, and especially targeting such markets you’ll often find data sheets giving a lot more detail about retention at temperature.
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@evey@chaos.social 2026-03-14 21:26
@swope@mstdn.plus @Aaron_DeVries@mastodon.social the main issue is the Tdelta between active and power off temps. if both are equal you end up with lower retention. Documented in JEP122
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@nblr@chaos.social 2026-03-14 21:57
@swope@mstdn.plus @Aaron_DeVries@mastodon.social I should know this and I didn't. Thank you!
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@andi@snac.sonnenmulde.at 2026-03-14 22:12
NVMe drives tend to get hot during usage - at least some models do at faster speeds. 40° C is not uncommon and by far not the highest temperature I have seen in working systems. So what was the NVMe (not ambient) temperature that lead to this outcome? Should have been quite a lot hotter then? CC: @Aaron_DeVries@mastodon.social
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@pthenq1@mastodon.la 2026-03-14 23:43
"@Aaron_DeVries Mientras realizaba pruebas ambientales en la carga útil de un helicóptero, descubrí que las unidades NVMe (y tal vez todos los SSD) pueden escribir datos a temperaturas ambiente elevadas (>40 °C), pero que dichos datos resultan menos permanentes que si se escribieran a temperaturas ambiente normales. Por ello, en los días calurosos teníamos que darnos prisa en copiar el contenido de nuestras unidades de 4 TB tras el vuelo, ya que los datos tenían una vida media de unas doce horas, aproximadamente. Este fenómeno ya está documentado, aunque no creo que sea ampliamente conocido." @swope@mstdn.plus @Aaron_DeVries@mastodon.social
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@valpackett@social.treehouse.systems 2026-03-15 00:25
@swope@mstdn.plus @Aaron_DeVries@mastodon.social huh.. 40 ambient is not that much! People live in climates where it's close to 50 in heatwaves, I haven't heard of anyone losing data to heatwaves…
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@glent@aus.social 2026-03-15 03:15
@swope@mstdn.plus @Aaron_DeVries@mastodon.social Hard disks are similarly thrilling for flight. There is a maximum altitude (3048m). Over that the risk of the disk head crashing into the platter is too great. That's why the datacentre for the Mauna Kea obervatories (9750m) is part way up the mountain.