The Canon Legria HF R68 supports an SDXC memory card which is better than the SD memory card supported by most small sensor size video cameras that have been available for more than a year. 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 across all comparable spec video cameras that have been available for around the same time as the Legria HF R68.
Across similar types of video camera the worst supported memory card type is SD.
SDHC cards are DS cards with a higher capacity of up to 32GB.