The Speed Class indicates the minimum continuous data transfer rate when writing video files to a memory card. The Speed Class number shows the transfer rate in megabytes per second. Class 2 cards are designed for a minimum continuous transfer rate of 2 MB/s, while Class 10 cards are for a minimum continuous transfer rate of 10 MB/s. The speed classes are divided into classes 2, 4, 6, and 10. For Full HD video (1080p), Class 6 is recommended at a minimum.

SD cards with the UHS-II standard offer up to 312 MB/s in compatible devices. Similar to UHS-I, there are also UHS speed classes: U1 for Full HD videos and U3 for 4K videos. Memory cards that support UHS-II are backward compatible and can be used in devices without UHS support (with limited performance).

The Video Speed Class includes five speed levels: V6, V10, V30, V60, and V90, with the number indicating the minimum write speed in megabytes per second (MB/s). By combining a device marked with Video Speed Class and an SD memory card with the same Video Speed Class marking, you can capture memories in quality. The fastest options, V60 and V90, support 8K resolution, while V6, V10, and V30 reliably capture Full HD and 4K resolution.