What is memory card class?

The same type of memory card, the same capacity, but they have different prices. Most people think it’s because of the brand, the quality of the processing… Actually there is another important factor that determines the value of a memory card, which is Speed Class, also known as Memory Card Class.

Memory Card Class

In this regard, the SD Association (SD Association) has issued special symbols and regulations for printing directly on memory cards to help users easily choose the right memory card for their needs. There are 2 types of symbols as shown below:

Both types of symbols above are symbols that specify the minimum performance that the memory card achieves in data transmission. This means that the transfer rate can be higher, for example, a class 6 memory card has a minimum transfer rate of 6MB/s.

– Speed Class we often see (phone memory cards) has classes of 2, 4, 6 and 10 used on consumer devices such as music players, smartphones or even laptops.

– UHS Speed Class includes UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3) used in specialized equipment such as cameras or camcorders…

Note: These two types of memory cards are completely different despite having the same shape. They do not support interoperability. At the present time, UHS is the fastest memory card used in high-definition movie recording (4K and above).

Reference table:

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