Blazing-Fast Speeds That Deliver Raw 4K Video When you're shooting where the action is, the CFexpress Card Type B unleashes the RAW performance of your gear. With read speeds up to 1700MB/s and write speeds up to 1400MB/s,6 you'll get low latency during high-speed recording and an enhanced workflow efficiency that's far beyond anything existing SanDisk cards deliver. This card enables smooth, RAW 4K video1 capture with sustainable performance. Backward-compatible with select XQD cameras that adopt firmware enabling CFexpress,2 the card includes both RescuePRO Deluxe Recovery Software3 and a limited lifetime warranty4 for added peace of mind.