The Sony HDR-PJ320 supports an SDXC memory card which is better than the SD memory card supported by most small sensor size camcorders that have been available for a similar time to it. In addition, this Sony video camera support MS PRO, MS PRO Duo, MS Pro-HG and MS Pro-HG Duo and SDHC memory cards. 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 similar spec camcorders that have been around for a comparable time to the HDR-PJ320.
The worst supported memory card type amongst comparable types of camcorder is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.