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Classes of the SD memory cards explained

You may have been wondering what all those single digit number inside a circle indicate on your memory card. The simple answer is that they indicate the class of the memory card. A class of the memory card is basically a measure for its speed.

Different classes are listed below along with their read/write speed:

Image

Class

Transfer Speed
( read/write )

class 2

2

2 MB/s

class 4

4

4 MB/s

class 6

6

6 MB/s

class 10

10

10 MB/s

A class 10 card is usually the most expensive ones. On average a 16 GB class 10 card costs you around Rs. 1,200