It's OK to use any card that meets DJI specs:Can anyone tell me if it's ok to use anything less than 90mbps speed micro sd/sd cards for 4K vids?
+1 for throwing 25% overhead in the mix. We need to allow for some brands where the quoted specs are a little on the optimistic side.Also, beware of the headline speed - it is almost always the read speed when what you need to know is the write speed. Technically any Class 10 card or better is enough - the video bit rate is 60Mbps - around 6MBps - but I am using only UHS Class 3 cards - which are rated for 30MBps (~300Mbps).
Here, "B" is bytes, "b" is bits and, accounting for overhead a 10x multiplier about right for simple calculations.
By the way, thumbs up to Peter's cat saying hello to us Cool and relaxing.
They are *almost* OK with the P4 - I make sure they are well clear if I ever do test flights in the garden, but the topcat (Dicky, NOT Leo who is the one in my Avatar) likes to bat at the P4 when it's prop-less and on a table indoors for maintenance
See about 30 seconds into my first test flight video
Dicky is the one nearest me (out of shot on the left) and again appears right near the end, still next to me. He is pretty fearless.