The GY-HM600 supports a better memory card type than most new comparable spec video cameras. This video camera supports an SDXC memory card, whereas most small sensor size camcorders that have been on the market for a comparable time to it support 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 actually the best supported memory card type amongst all small sensor size camcorders that were launched in the last year.
An SD memory card is the worst supported memory card type across comparable types of camcorder.
SDHC cards are DS cards with a higher capacity of up to 32GB.