Article ID : 00055967 / Last Modified : 14/11/2017

What are the different Speed Class ratings for SD, SDHC, and SDXC memory cards?

    The following are Speed Class ratings for SD, SDHC and SDXC memory cards:

    • Class 2: Recommended for Standard Definition video recording
    • Class 4: Recommended for High Definition video recording
    • Class 6: Recommended for High Definition video recording 
    • Class 10: Recommended for Full High Definition video recording
    • UHS-I Class 1:  For recording large-sized High Definition video
    • UHS-II Class 3:  Capable of recording 4K video

    NOTE: The Speed Class rating is the official unit of speed measurement as defined by the SD Association. For complete information, visit the SD Association website.