I wrote to support and told them, that my mini SD Extreme Pro card does not work in my GoPro 3 Hero Black Edition, but they had never heard about the problem before. So I send them this:
The card is placed in my GoPro Hero 3 Black and is skipping frames. When I import it into FCP frames are missing.
I read about other having the same problem here:
One guy wrote:
SD card fables:
1 - Gopro camera does not format the SD card, it only clear the index on the card.
2 - Class 10 card is not sufficient, I had some freezes, test the card writing speed on a USB3 PC and select a card with writing speed > 10MB/s
3 - The well know Sandisk class 10 UHS-1 cards are no good for reliable working, Their writing speed is little below 10MB/s
4 - Best card for Hero 3 black is Transend class 10 UHS-1 with writing speed of > 17MB/s
I have installed the latest firmware and formatted the card on a max and after that in camera, but it is still skipping frames.
I have ordered a Transend.