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Choosing the Right MicroSD Card

Speed symbols are used to define Speed Class standards. Consumers can use speed symbols to determine if the card meets the required minimum performance.
Two kinds of speed indicators are in place to determine SD bus generation: the “Speed Class” Mark and “UHS Speed Class” Mark.
Both symbols indicate minimum writing performance to ensure the smooth writing of streaming content such as video shooting.
 
The SD Association defines Speed Classes as 2, 4, 6, and 10. These stand for 2 MB/s, 4 MB/s etc.
If the host devices requires a Speed Class of 4 SD memory card, you can use Speed Card 4, 6, or 10. If your host device requires Speed Class 6, you can use Speed Class 6 or 10.
UHS Speed Class is only for UHS devices and include UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3). U1 has a minimum write speed of 10 MB/s and U3 has a minimum write speed of 30 MB/s.
Speed Class and UHS Speed Class are not compatible.
 
 
Four Signs You Need a Faster SD Card
 
1) Long Buffering. When you press the shutter to take a shot, but the camera until the data is fully written into the card.
2) Corrupted video. If the card is too slow, the final video may be corrupted and at a lower resolution.
3) Shortened clips. When the camera has a higher writing speed than a flash card, the camera pauses and the video will just cut out and end.
4) Burst shooting. Burst mode won’t work properly if your card writing speed isn’t fast enough.