The Canon XA20 supports an SDXC memory card which is better than the SD memory card supported by most small sensor size camcorders that have been around for around the same time as it. In addition, this Canon 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).
An SDXC memory card is in fact the best supported memory card type amongst all small sensor size camcorders that are a comparable age to the XA20.
Amongst similar 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.