As of this article, there are various classes of the SD card specification. This article will introduce and compare the speeds of each class.
The available classes of an SD card includes: 2, 4, 6, 10, and Ultra High Speed (UHS).
Class 2 supports 2MB/s in minimum speeds.
Class 4 supports 4MB/s in minimum speeds.
Class 6 supports 6MB/s in minimum speeds.
Class 8 supports 8MB/s in minimum speeds.
Class 10 supports 10MB/s in minimum speeds.
The UHS class SD card supports up to 104MB/s.
There is a simple formula to remember the speeds of each class. Each class number represents the megabytes per second that the class supports.
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