Cards with a UHS Speed Class 3 (minimum transfer rate of 30 MB/s) or better rating are recommended when recording 4K (3840 × 2160), full-HD 120p/100p, and full-HD slow-motion videos. SD Speed Class 6 or higher cards are recommended when recording full-HD (1920 × 1080) 60p/50p/30p/25p/24p videos.