ProGrade Digital CFast 2.0 Cobalt Memory Card: Maximum read speed up to 550MB/s Burst write speed up to 520MB/s Minimum sustained write speed up to 470MB/s Capacities: 320GB and 640GB MSRP: $329.99 and 599.99 respectively CFast 2.0 320GB and 640GB Cobalt Delivers: Optimized co...