Ans: In picture we can see the class of memory,which indicate the read and write speed of the memory card.One things we know that the speed of a memory card depend on the read and write speed.
severely we can see 2 ,4 ,6, 10 classes memory card.below given the class wise speed.
Class 2 guaranteed minimum write speed of 2MB/s or higher*
Class 4 guaranteed minimum write speed of 4MB/s or higher*
Class 6 guaranteed minimum write speed of 6MB/s or higher*
Class 10 guaranteed minimum write speed of 10MB/s or higher*
U define the ultra fast speed where U1 supports at least a 10MB/s write speed,
and U3 cards offer at least a 30MB/s write speed.
so when we buy a memory card we should check the read and write speed for best memory card performance.
sbtech 