Recently, foreign media reported that Canon 5D Mark IV will be equipped with dual memory card slots, which are composed of CFast 2.0 card slots and SDXC UHS-II card slots. This also means that CF memory cards that have been used for many years in the 5D series will be gradually eliminated. In addition, 5D Mark IV also Touch screen function will be added. CFast 2.0 card and SDXC UHS-II card are both new generation high-performance memory card standards. SDXC UHS-II standard is downward compatible with SD memory card, while CFast2.0 is a new standard memory card, which is not compatible with CF card, and the card slot is also different from the past.

Therefore, the data storage of 5D Mark IV will be the same as that of 1D X Mark II. When shooting 4K video, the high-performance memory card is the standard configuration. UHS Speed Class 3 has defined a minimum continuous write speed of 30MB/s to ensure high-quality video recording under the new standard. 4K/2K video, live broadcast, and other high-performance cameras and cameras will benefit from this. The new device is fully compatible with existing SD standards and devices, but its speed and performance will be limited. The UHS-I card can reach 104MB/s, while the UHS-II card can reach 312MB/s. CFast 2.0 theoretically has a reading speed of 450MB/s and a writing speed of 350MB/s. It is also characterized by its firmness, and can withstand real temperature changes (23 to 158 degrees Fahrenheit), vibration, impact, and the design with or without holes.