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   Gary Parker :party_porg: (witewulf@cyberplace.social)'s status on Thursday, 17-Apr-2025 14:38:50 JST Gary Parker :party_porg:

   Oh, this is interesting (and a little scary)

   tl;dr don’t use SSDs for long term, offline storage. The data degrades after as little as two years without the drives being powered up

   https://www.tomshardware.com/pc-components/storage/unpowered-ssd-endurance-investigation-finds-severe-data-loss-and-performance-issues-reminds-us-of-the-importance-of-refreshing-backups

   • silverwizard repeated this.
   • Embed this notice
     Rich Felker (dalias@hachyderm.io)'s status on Thursday, 17-Apr-2025 20:21:19 JST Rich Felker

     in reply to

     • Pavel Machek

     @pavel @WiteWulf I suspect this is the cause of most rpi sd card corruption, and it's the result of host computer cheaping out on basically one capacitor that could ensure card retains power for a minimum period of time after host has gone down and new commands are no longer possible.

   • Embed this notice
     Pavel Machek (pavel@social.kernel.org)'s status on Thursday, 17-Apr-2025 20:21:21 JST Pavel Machek

     in reply to
     @WiteWulf Well, if you want more scary stuff... cut SSD power during write operation. It is quite hard to get FTL right, and I'm pretty sure some vendors simply don't. Result is... a brick.
   • Embed this notice
     Gary Parker :party_porg: (witewulf@cyberplace.social)'s status on Thursday, 17-Apr-2025 20:21:22 JST Gary Parker :party_porg:

     in reply to

     • Pavel Machek

     @pavel it is not well known to the vast majority of users.

   • Embed this notice
     Pavel Machek (pavel@social.kernel.org)'s status on Thursday, 17-Apr-2025 20:21:24 JST Pavel Machek

     in reply to
     @WiteWulf Flash needs periodic scrubbing, that should be well known? And yes, scrubbing is hard to do with power off :-). Retention on flash also depends on temperature when data was stored and storage temperature, if you want more fun :-).
   • Embed this notice
     Quincy (quincy@chaos.social)'s status on Friday, 18-Apr-2025 00:41:59 JST Quincy

     in reply to

     @WiteWulf

     Very scary. This sets us up for digital amnesia ...

     (puts old-fashioned hard drives on shopping list)

   • Embed this notice
     Rich Felker (dalias@hachyderm.io)'s status on Friday, 18-Apr-2025 21:06:34 JST Rich Felker

     in reply to

     • Pavel Machek

     @pavel @WiteWulf The needed size should be easily computable from the max current SD card is allowed to pull and the max write time in the spec or something like that.

     Haelwenn /элвэн/ :triskell: likes this.
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     Pavel Machek (pavel@social.kernel.org)'s status on Friday, 18-Apr-2025 21:06:36 JST Pavel Machek

     in reply to

     • Rich Felker
     @dalias @WiteWulf Yes, that's likely a problem. And my guess is that a) it is not clear how big capacitor is required and b) rpi expects well-designed cards and cards expects power-supply that does not cut out randomly :-(.