SanDisk 64GB Extreme PRO CFast 2.0 Memory Card combines the speed, capacity, and performance needed to record uninterrupted DCI 4K video, which has a resolution of 4096 x 2160 and a 17:9 aspect ratio. It features a SATA III 6 Gb/s bus, a maximum read speed of up to 525 MB/s (3500x), a maximum write speed of up to 430 MB/s, and a minimum write speed of 130 MB/s.