Memory cards are used in digital cameras, music players, smartphones, tablets, and even laptops. But not all SD cards are created equal — there are different speed classes, physical sizes, and capacities to consider.
Different devices
require different types of SD cards. Here are the differences you’ll need to
keep in mind when picking out the right SD card for your device.
| Mark | Minimum Serial Data | SD Bus Mode | Application | |
| UHS Speed Class |  | 30MB/s | UHS-II UHS-I | 4K2K Video Recording |
 | 10MB/s | Full HD Video Recording HD Still Image Continuous Shooting | ||
| Speed Class |  | 10MB/s | High Speed | |
 | 6MB/s | Normal Speed | HD and Full HD Video Recording | |
 | 4MB/s | |||
 | 2MB/s | Standard Video Recording |
Speed Class and UHS Speed Class* symbols indicate minimum writing performance to ensure smooth writing of streaming content such as video shooting. This is important mainly for camcorders, video recorders and other devices with video recording capabilities.
Speed Class
designates minimum writing performance to record video. The Speed Classes
defined by the SD Association are Class 2, 4, 6 and 10.
UHS Speed Class is
designed for UHS** devices only and designates minimum writing performance to
record video on UHS products. The UHS Speed Classes defined by the SD
Association are UHS Speed Class 1 (U1) and UHS Speed Class 3 (U3).
* (Speed Class and
the UHS Speed Class are not compatible.)
**UHS (Ultra High
Speed), the fastest performance category available today, defines bus-interface
speeds up to 312 Megabytes per second for greater device performance. It is
available on SDXC and SDHC memory cards and devices.
