Geebax
Captain
Australia
Offline
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I did read your post, I just did not respond. Define a "Professional Card"?
In terms of SD cards there is no professional card, just various speed ratings, of which the only one that matter is the write speed. As long as the card can write at a speed of 40 Mb/s or 60 Mb/s in the case of the P3 Pro, then it will most likely work OK.
My point is that few card makers accurately specify the write speed, often opting to publish the read speed in an effort to convince you the card is fast. So for those who do not know how to tell the difference, you are safer to buy a known good speed card. Hence my recommendation of the Sandisk Extreme series.
As to your cards, the: Card A: Extreme UHS-1 microSDHC Memory Card 95 mb read and 90 mb write I am assuming the Extreme bit means it is a Sandisk card, and also the 90 mb refers to 90 mb/s which is the correct way to write the speed rating.
As to why one card worked and the other did not, I can't say. There are a couple of possibilities, one is that Card A was a counterfeit card. I have seen photos of real and counterfeit cards in their packaging and it is near impossible to tell them apart. Your only protection is buying them from a reputable dealer.
The other possibility is the formatting. If you formatted them in a computer before putting them in the camera, that might have triggered an 'invalid card' response.
Testing the card in a Mac would tell you nothing. The GoPro test is probably valid, but I have never put a slow card into my Go Pro to see what it would do.
All of this is conjecture anyway, as DJI don't come out and say why the card produces that message. I am just working on past experience with other high end camera systems. Blackmagic cameras do test the card and will reject it if it is too slow, but they are even more obtuse and strange about it, the camera simply refuses to go into record, which annoys the hell out of users. However their cameras are often making far greater speed demands than the DJI camera, as they are trying to record RAW video files.
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