About half a year ago I read on Hacker News about these affordable yet robust microSD cards from ATP (Taiwan). A 4GB card is about $15, which is pretty damn cheap for anything “industrial”.
(Note the PDF datasheet there.)
This model is supposed to tolerate sudden power cuts much better than the typical microSD card, which, as many have noticed, often dies after a couple of power cuts.
For the past few days I’ve been power-cycling a Raspberry Pi 3B+ a few thousand times with this card, running our Balena app. It currently writes quite verbose log files to the SD card on startup.
Tldr: so far, it’s looking pretty good. A few thousand random power outages (5 seconds power outage, then the device gets power for 2-152 secs, linearly randomly), and it’s still booting fine.
I’ll report back with more progress and details - I plan to test this for at least 10k random reboots.