The JVC GZ-R310 supports an SDXC memory card which is better than most video cameras of a similar spec and age to it. Most similar spec camcorders that came out around the same time as it support an SD memory card. In addition, this video camera 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 actually the best supported memory card type across all comparable spec camcorders that were released around the same time as the GZ-R310.
An SD 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.