The GZ-R315 supports an SDXC memory card which is better than the SD memory card supported by most small sensor size camcorders that have been around for more than a year. 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).
This video camera's memory card type (SDXC) is in fact the best supported memory card type across all small sensor size camcorders that came out around the same time as the GZ-R315.
An SD memory card is the worst supported memory card type amongst similar types of video camera.
SDHC cards are DS cards with a higher capacity of up to 32GB.