The GZ-R315 supports an SDXC compatible memory cards which is better than most camcorders of this age and type. Most camcorders of this spec and age support an SD compatible memory cards. In addition, this JVC video camera supports an SDHC compatible memory cards. 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 compatible memory cards is actually the best supported memory card type across all camcorders of this type and age.
The worst supported memory card type across similar types of camcorder is SD.
SDHC cards are DS cards with a higher capacity of up to 32GB.