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Posted by on March 1, 2019

Whether playing with a camera or a camera, the data must be recorded on the memory card, and the SD card is the most widely used and most concerned memory card. From Specification 1.0 to Specification 5.1, from Class10 to UHS-III, from Viagra

Premier ONE Series (and Reyksha Professional 2000x UHS-II and Extreme PRO)

UHS-II, which has the same writing speed as 260 MB/s, and Sony SF-G series (299 MB/s, the fastest in the world), all indicate that SD cards are constantly improving their performance to meet the needs of the public.

So, in such a dazzling array of SD card manufacturers and brands, in the various SD card writing speed and storage specifications, how can we ensure the correct choice of SD card?

From SD to mini SD to micro SD, three sizes meet your needs

According to the appearance, SD cards can be roughly divided into SD cards, Mini SD cards, micro SD cards (formerly known as TF cards). Different devices use different sizes of SD cards. Standard SD is the largest. Most consumer digital cameras and cameras on the market today use this standard SD card, which has a standard “missing angle” design. Mini SD card is smaller than standard SD card, which was originally designed for notebook computers, but now it is very rare because notebooks are compatible with standard size SD cards. Micro SD is the smallest SD card standard, which we usually call TF card. Most mobile phones support this card. They are also widely used in other devices, such as Ipad.

Detailed parameters of SD cards with different shapes

From SD to SDHC to SDXC, from class10 to UHS-I, UHS-II to UHS-III

Thankfully, the SDA (SD Card Association) has constantly introduced new specifications and standards to improve the performance of SD cards in a straight line, so that they can keep up with or even exceed the rhythm of host development in speed and capacity. According to the capacity of SD card, SD card can be divided into SD, SDHC (SD High Capacity) and SDXC (SD Extended Capacity). At present, SDHC card and SDXC card are the handlebars on the market. SD card is in the trend of elimination because of its small capacity, and it almost disappears on the market.

What factors determine the speed of a SD card, which is not much larger than a dollar coin, which will affect the fluency of the whole shooting or using process?

SD Card’s Self-Conditions-Foot Position

The first SD card has only one row of feet, and can only accept general speed, high speed and UHS-I card to receive bus interface signals.

The second generation SD cards, i.e. standard size SD cards and micro cards

The SD card adds a second row of foot configurations to cater for UHS-II signals. The first row of footholds retained are used to receive the first generation SD card bus interface signals to provide commonality with existing devices that cannot accept UHS-II. But for the newly released UHS-III high-speed interface signal, it is also assigned to the second row of UHS-II SD card pins, which will not change the physical size or shape of the existing SD card. Because from

UHS-II to UHS-III only involves physical layer (PHY) technology changes, making the existing UHS-II products relatively convenient and rapid upgrade to UHS-III. You must know how to restore deleted pictures from sd card?

Compatibility between SD Card and Host

Many times you will find that even if your SD card is fast enough, it can’t reach your ideal state when you use it, because your SD card is incompatible with your host or reader. For example, your SD card is a high-speed card, and the lowest bus interface speed is UHS-I, but the lowest bus interface supported by your host is Class10, so SD can only import data at the speed of Class10 in the whole process. The same applies to laptop USB sockets, card readers or import data lines. It is in this way that we say that the speed of SD card is the throat that restricts the whole shooting or other use processes. It’s just like the most important and critical part of the system. If the speed of SD card can’t keep up, the whole system can’t run smoothly or even paralyze.


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