SanDisk Extreme

Available in capacities from 32GB-256GB and read speeds of up to 90MB/s for fast data transfers. The cards are compatible with SDHC and SDXC-enabled devices.

Video Speed Class includes five speed levels V6, V10, V30, V60 and V90, with the number indicating the minimum write rate in megabytes per second (MB/s) in each case. By combining a Video Speed Class labelled device and an SD memory card with the same Video Speed Class label, memories can be captured in quality. The fastest options, V60 and V90, support 8K resolution, while V6, V10 and V30 reliably capture Full HD and 4K resolution.

The Speed Class indicates the minimum continuous data transfer rate when writing video files to a memory card. The Speed Class number indicates the transfer rate in megabytes per second. Class 2 cards are designed for a minimum, continuous transfer rate of 2 MB/s and Class 10 for a minimum, continuous transfer rate of 10 MB/s. The speed class is divided into classes 2, 4, 6 and 10. For full HD video (1080p), at least Class 6 is recommended.

UHS-I capable SD cards allow theoretical data transfer speeds of up to 104 MB/s. The speed class is indicated as U1 or U3: U1 for Full HD videos - and U3 for 4K videos. Memory cards with support for UHS-I are backwards compatible and can be used in devices without UHS support (with limited performance).