tf card reading and writing speed ranking ranking

First of all, let’s take a look at the current specifications of TF cards, because these specifications are what we want to know today. Usually manufacturers will print the speed specification of the product on the product. The current speed grades of mainstream TF cards are Class10 and higher speed UHS-1. Let’s first look at the detailed explanation of these two terms.

UHS-1 memory card High-speed) interface, its bandwidth reaches 104MB/s. On this basis, if the memory card performance can meet the standards for real-time storage of high-definition videos, it can be marked "UHS Speed ​​Class 1". However, this speed only represents the bus specification and does not represent the internal speed of the flash memory.

For example, the SATA3.0 interface in a hard disk has a speed of 600M, but a mechanical hard disk can only reach a speed of 150m/s. The internal transmission of the mechanical hard disk is the decisive key, and the same is true for flash memory!

In the SD2.0 specification, the performance of SD cards is divided into the following levels. Different levels can meet different application requirements:

Class 0: Including conditions lower than Class 2 and not marked with Speed ​​Class; Class 2: Suitable for watching ordinary MPEG4 MPEG2 movies, SDTV, and digital camera shooting;

Class 4: Can play high-definition smoothly TV (HDTV), digital camera continuous shooting and other needs;

Class 6: Meet the requirements for SLR camera continuous shooting and professional equipment;

Class 10: Meet the storage needs of higher speed requirements .

Note: Class level is converted based on 8KB per second. If 8KB per second is less than the corresponding writing speed, the card is fake! Class4 has a minimum write speed of 4MB/s, and Class10 means a minimum write speed of 10MB/s.

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