The Legria HF G40 supports a better memory card type than most small sensor size video cameras that were released around the same time as it. This video camera supports an SDXC memory card, whereas most newly released video cameras support 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 small sensor size video cameras that are a comparable age to the Legria HF G40.
The worst supported memory card type across comparable types of video camera is SD.
SDHC cards are DS cards with a higher capacity of up to 32GB.