The Vixia HF R40 supports an SDXC memory card which is better than the SD memory card supported by most video cameras of this spec and age. 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).
This camcorder's memory card type (SDXC) is in fact the best supported memory card type amongst all camcorders of a similar type and age to the Vixia HF R40.
Amongst comparable types of camcorder the worst supported memory card type is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.