What do SD, SDHC, and SDXC Flash Memory Card Standards Signify?
https://www.cactus-tech.com/resources/blog/details/what-do-sd-sdhc-and-sdxc-flash-memory-card-standards-signify/
webFeb 20, 2014 · SD refers to the original Standard Capacity SD Card. SDHC refers to SD High Capacity and SDXC represents SD eXtended-Capacity. There is also a non-memory standard called SDIO for SD IO Devices with wide ranging functions such as Wi-Fi, GPS, Cameras, FM Radio, Bluetooth, Digital TV Tuner, Scanner, Voice Recorder and others.
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