The Vixia HF R300 supports an SDXC memory card which is better than the SD memory card supported by most camcorders of a comparable spec and age to it. In addition, this camcorder 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 actually the best supported memory card type across all similar spec camcorders that are a comparable age to the Vixia HF R300.
Across comparable types of video camera the worst supported memory card type is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.