All cards are not equal.
Am looking into a large capacity of micro SD card that is capable of 4K recording. I tried all of my current micro SD cards writing to a DJI Osmo Pocket with 4K 60fps settings, all worked fine. I don’t know if there are frames dropped but it shows the clip.
When I read online, one link directed me to this website to test the read and write speeds of the card.
