The JVC GZ-HM440 supports an SDXC memory card which is better than the SD memory card supported by most camcorders that were launched more than two years ago. 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 have been available for a comparable time to the GZ-HM440.
The worst supported memory card type amongst similar types of camcorder is MicroSD (Transflash).