There are four main families of SD Card products with three related to memory devices.
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.
- From 64GB to 2TB in Capacity
- exFAT File System
- SD, miniSD and microSD form factors supported
- Sometimes represented as SDXC, microSDXC
- Cactus Commercial Grade SD Cards support this standard