UHS-III?SD Express?Thinking about SD memory card situation that is somewhat confused

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Recently, listening to the word "UHS-III" has increased.If you wonder if UHS-III's SD card will be released, there seems to be some difficult circumstances.Is the next generation SD card going to be confused?Let's think about what to choose.Introducing the details of "SD memory card" in photos

Fast faster transfer standard of SD card "UHS-III" and "SD Express"

The SD memory card is currently selling cards up to UHS-II.There are two types of UHS type SD cards with two types of speeds per class, and the speed of the card is determined by the "bass speed controller", for example, a 104MB/s "SDR104 controller" for UHS-I.Use either 50MB/s "SDR50 controller".If you use 104MB/s for writing, it will be a high -speed type, and if you use 50MB/s for writing, it will be a popular SD card.Currently, the fastest UHS-II bath speed is 156MB/s for a popular type and 312MB/s for high-speed type, which is slower than CFEXPRESS has realized 1500MB/s.As a result, the UHS-III standard with a maximum of 624MB/s and the SD Express standard with a maximum of 3940MB/s writing will be formulated as the next generation SD card.

Read 300MB/s, writing 250MB/s

■ There are two types of SD cards, which have two kinds of speeds, and there are two types of SD cards that are on sale, for each class such as UHS-I and UHS-II,: a popular type and a high-speed type.

CFEXPRESS card (read 1700MB/s, writing 1400MB/s)

■ CFEXPRESS TYPE-B card is expected to speed up SD cards. The SD card currently is currently used most, but with the appearance of a super high-speed CFEXPRESS card, the SD card is also a long-awaited appearance.It is done.

"UHS-III" standard "UHS-III", high-speed but poor compatibility "SD Express" standard

You can check the transfer speed on the SD association website

Once the CF card, which was said to be fast, read it out, and both wrote 150MB/s. It is much slow from the current UHS-II SD card. Therefore, the ultra -high -speed CFEXPRESS card was a maximum reading of 1700MB/s and a maximum of 1500MB/s. However, there was a problem that CF cards and CFEXPRESS cards are not compatible. No matter how fast, the CFEXPRESS card cannot be used for digital SLR cameras in CF card slots. In the SD card, the UHS-III standard has a backward compatibility, but the maximum speed is about 624MB/s. This is much slower than the CFEXPRESS card. Therefore, UHS-III cards are not yet sold. On the other hand, the SD Express standard can achieve a maximum of 3940MB/s by writing, but this has a compatibility problem. It seems that the SD card maker to choose which one has no decisive factor and is in trouble.

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