The GZ-RX515 supports an SDXC compatible memory cards which is better than the SD compatible memory cards supported by most video cameras of a similar age and spec to it. This JVC video camera also supports an SDHC compatible 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 compatible memory cards is actually the best supported memory card type across all video cameras of this age and spec.
An SD compatible memory cards is the worst supported memory card type amongst comparable types of video camera.
SDHC cards are DS cards with a higher capacity of up to 32GB.