The Canon Vixia HF M500 supports an SDXC memory card which is better than the SD memory card supported by most video cameras of a similar spec and age to it. 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 across all small sensor size camcorders that were launched around the same time as the Vixia HF M500.
The worst supported memory card type across comparable types of camcorder is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.