Experience of SD Card Purchase
Speaking of SD card products, we can say that they are both familiar and unfamiliar. Say familiar with most friends more or less have used, such as as as cameras, traffic recorders or GoPro, mobile phone storage expansion and other applications will be used. But unfamiliar, but also because many friends at most look at SD card capacity and price, for a variety of interface standards, speed certification, and even SD card specifications are not well understood. In this way, when choosing SD cards, it is bound to be easy to discredit both eyes and eyes. Either you spend more money to buy high-end SD cards that don't need to be so fast, or you save money incorrectly. You buy middle and low-end SD cards that can't perform well, or even miscellaneous brands of products.
If you have all kinds of confusion and puzzlement about SD card, maybe this article can be used as a good introduction to give you some reference. All right, let's go!
Introduction of SD Card Standards and Specifications
But then again, online articles about the selection and comparison of cameras and lenses can be said to be overwhelming, but the introduction of SD cards is extremely rare. Many friends are still confused about the difference between SD cards and Micro SD cards. They can only be explained by relatively popular "big card" and "small card". In fact, the real "big card" must be CF card. If you lost your photo, you must picture recovery from sd card, The good quality SD card can avoid this problem as much as possible.
CF card is called Compact Flash card. It was originally because of its large size, large capacity and fast speed. It has always been a symbol of performance in the professional field. It was first promoted by several Silicon Valley giants, such as an Intel-based storage protocol in Lexar, and later by Taiwan, China, these firms chose to join. The most important feature of CF card is fast. For example, the 33333X CFast CF card issued by Rexha in 2014, which reads at a speed of up to 500MB/s, is the best choice for professionals (such as Canon 1D series users) for many years. Of course, with the popularization of DSLR and non-DSLR (micro-DSLR) cameras, the development of SD card technology has become a mainstream product. Micro SD card is also called TF card. At present, it is mainly used for expanding space on mobile phones, and some card machines use this kind of memory card.
Early data writing speed gear up to 10, that is, the so-called "Class 10", has been the mainstream level. At present, UHS interface standard is generally used to locate the grade and speed of SD card. The mainstream is advancing from UHS I standard to UHS 2 standard. UHS writes at 1 and 3 levels, and 3 levels are faster. Finally, there is a V + symbol, usually V30, V60, which is the standard to express the speed of video writing.
Specific speed differences can be seen in the table below. Generally speaking, the writing speed of 30MB/s can already shoot 4K video, but in order to ensure the video quality as far as possible, it is recommended that V60 or V90 standard SD card.
Finally, the latest UHS II standard interface can also be seen at a glance, because it adds a row of interfaces to a generation of products.