64 GB capacity: A 64 GB SD card should be spacious enough for most uses, and such cards are less expensive per gigabyte than 32 GB cards.But you don’t get the full speed of UHS-II unless both camera and card support UHS-II, because it requires an additional row of physical pins to achieve its extra speed. The standard is backward-compatible, meaning you can use a faster UHS-II card with a UHS-I camera, or a UHS-I card with a UHS-II camera. All the point-and-shoot cameras we recommend support at least UHS-I bus cards. UHS-I bus mode: Bus mode is a standard that dictates how different generations of SD cards work.Unless your device shoots only 1080p video, it’s worth confirming that a card has a U3 rating, which gives you the option to shoot 4K. U3 is required for 4K video and designates a minimum write speed of 30 MB/s. U3 rating: Since most cards now have speeds faster than 10 MB/s, Ultra High Speed classes further differentiate their performance.
(The other speed classes are 2, 4, and 6, which also denote the minimum write speed in megabytes per second.)
