\ Why is it that some people have good computers, yet reading photos or games from the memory card is still very slow? \ That's because when many people buy memory cards, they only pay attention to the storage capacity and ignore the transfer speed. \ The two important pieces of information on an SD card are storage capacity and transfer speed! The capacity is easy to understand; the common ones are 4GB, 8GB, 16GB, 32GB, and you can choose according to your needs. \ Another important piece of information is the transfer speed. The transfer speed of an SD card represents its performance. The number in the red box in the picture above indicates the speed class. \ In the SD 2.0 standard, the method for classifying SD card speed is: \ Regular cards and High-Speed cards \ The speed rating of high-speed cards is defined as four classes: Class 2, Class 4, Class 6, and Class 10. \ The speed rating for ultra-high-speed cards currently has only one level: UHS Class 1. \ Sometimes, for the same capacity, the price varies significantly depending on the transfer speed, so you should choose the transfer speed according to your specific needs. \ Here are the applications for each speed class:
Class (marked 'HD' on the card) s 0: includes below Class 2 and cases where the speed class is not marked; \ Class 2: can handle watching regular MPEG4 or MPEG2 movies, and SDTV digital camera recording. The read speed is 2.0MB/s; \ Class 4: can smoothly play HDTV, and handle digital camera continuous shooting and similar needs. The read speed is 4.0MB/s; \ Class 6: meets the needs of DSLR continuous shooting and professional equipment. The read speed is 6.0MB/s; \ Class 10: meets real-time recording for full HD TV. The read speed is 10.0MB/s; \ UHS Class 1: professional real-time full HD TV recording. The read speed is 312.0MB/s. \ How to choose an SD card? \ For ordinary users, Class 4 is sufficient for daily needs and can be used in devices such as mobile phones. If you use a DSLR and sometimes need to do continuous shooting or shoot high-definition videos, you need a higher transfer speed, such as Class 6 or Class 10. For UHS Class 1, non-professionals do not need to consider it at all. \ Therefore, when purchasing, you should not only look at the capacity but also check the transfer speed clearly. Of course, card quality is also a consideration, and it is best to choose SD cards from major well-known brands.Don't let businesses pass off inferior products as good ones, deceiving the kind hearts of the vast majority of consumers~\OK, having said so much, does everyone now have a better understanding of SD cards?\PS My card is a class 6, been making do with it.
