On 5/2/20 10:48, Chris Murphy wrote: > In my very limited sample size from a single vendor, I've only seen SD > Card fail by becoming read only. i.e. hardware read-only, with the > kernel spewing sd/mmc related debugging info about the card (or card's > firmware). Maybe that's a good example? I suppose it's better to go > read-only with data still readable, and insofar as Btrfs was concerned > the data was correct, rather than start returning transiently bad > data. However, I only knew this due to data checksums. I use Raspberry Pis a lot, so I've been forced to acquaint myself with micro-SD cards. I don't see *that* many failures, but the ones I have seen are sudden and total, i.e, the card simply doesn't respond anymore. I think I also saw one suddenly drop to a capacity of 16 MB. Electrical abuse may have been a factor in some of these failures, in the others there was no obvious cause. I do trim them frequently to avoid write amplification. Phil
