The JVC GZ-HM450 supports an SDXC memory card which is better than most camcorders of this type and age. Most small sensor size camcorders that have been around for a comparable time to it support an SD memory card. This video camera also 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 actually the best supported memory card type amongst all video cameras of this age and type.
The worst supported memory card type amongst similar types of camcorder is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.