What are UHS interface and UHS Speed Class? Category : Specification / Capacity / Performance UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds of up to 312 Megabytes per second. It is exclusively designed for SDHC and SDXC memory cards, and compatible with SDHC and SDXC devices. Is the answer helpful? Related What should I do if I cannot delete or format my SD/SDHC card due to write protection? What is ECC? What should I do if I cannot delete or format my microSD/SDHC/SDXC card due to write protection? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started