The JVC GZ-HM30 supports an SDXC memory card which is better than most camcorders of a similar spec and age to it. Most small sensor size camcorders that came out around the same time as it support an SD memory card. In addition, this JVC video camera 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 across all similar spec video cameras that were launched around the same time as the GZ-HM30.
The worst supported memory card type amongst comparable types of video camera is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.