The 256GB UHS-II SDXC Iridium Memory Card from ProGrade Digital features a storage capacity of 256GB and takes advantage of the UHS-II bus to support advanced DSLR and mirrorless functions such as continuous shutter bursts and rapid shooting as well as raw and JPEG captures. This card is also well-suited for video capture, including 4K and Full HD video, and can achieve maximum read speeds of up to 300 MB/s and maximum write speeds of up to 275 MB/s. Thanks to its V90 speed class rating, minimum write speeds are guaranteed not to drop below 90 MB/s.