When I got my dashcams, which is the hardest duty for SD card. Constant writing and massive temperature swings. I used 32gb cheap cards, they failed within a month. I replaced them with name brand cards, again, all 3 cameras failed within another 2 months. I've also had SD cards fails multiple times with my RPi. The only solution was to buy the High Endurance SANDisk cards. I'm 8 months in and they are still going. But I expect them to fail soon enough. SD cards shouldn't be used for reliable storage, period.
skreak
joined 1 year ago
Just a thought on electrical grounding issues - Any GRND imbalance between the external PSU and the server will result in a small current flowing through the card via the GRND traces. In a perfect world this should be negligible, however, to play it safe I would make sure the server and PSU are plugged into the same power strip at all times so they share the same ground bus bar. If you have a multimeter available I would also verify that the voltage difference between the grounds on the DC side of the 2 PSU's is exactly 0 is very very close to 0v.