Hi
I tested the need for a Class 10 U3 or if a Class 10 U1 card is enough.

Please find my video here. German with english subtitles


Result: If all fail, a U1 will/ could make it. But for long videos as well pictures you need to go with a U3. The U1 is just blocking the MA to long during the writting process.

I'm using u3 and it works like charm with 4k

I always go with the Sandisk Extreme Plus 64 GB card and it's never failed on me. Maybe not needed in every situation, but better safe than sorry.

Thank you for sharing I was very curious if slow sd card warning will disappear when U1 will be replaced with U3 now I know that yes it will disappear and also saving time is much faster.