The Canon Vixia HF R21 supports a better memory card type than most video cameras of a similar age and spec to it. This Canon camcorder supports an SDXC memory card, whereas most similar spec camcorders that were released more than two years ago support an SD memory card. This video camera also supports an SDHC memory card. SDXC cards are SD cards but with a much higher capacity and faster processing speeds. They have a maximum capacity of 2TB (Terabytes).
An SDXC memory card is in fact the best supported memory card type across all video cameras of a similar type and age to the Vixia HF R21.
A MicroSD (Transflash) memory card is the worst supported memory card type across similar types of video camera.
SDHC cards are DS cards with a higher capacity of up to 32GB.