The Canon Vixia HF R42 supports an SDXC compatible memory cards which is better than the SD compatible memory cards supported by most camcorders that were released more than two years ago. In addition, this Canon camcorder 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 in fact the best supported memory card type amongst all camcorders of a similar age and spec to the Vixia HF R42.
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.