SD Speed Class/UHS Speed Class
Greater Performance Choices
There are two kinds of Speed Class, "Speed Class" and "UHS Speed Class."
As a characteristic of flash memory, actual transfer speed varies. Variable speeds are difficult to reliably record streaming content such as video because it requires a constant writing speed. Speed Class and UHS Speed Class provide the constant speed necessary for video recording by designating a minimum writing performance so that minimum and constant speed is guaranteed for camcorders, video recorders and other devices with video recording capabilities under the conditional write operation specified in the standard.
Speed Class, designated as Class 2, 4, 6 and 10, is designed for normal and high speed bus interface (mode) and UHS Speed Classes 1 and 3 are designed for UHS bus interface*. (Speed Class and the UHS Speed Class are not compatible.)
*UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 312 Megabytes