The Legria HF G40 supports an SDXC memory card which is better than the SDHC memory card supported by most comparable spec video cameras that came out around the same time as it. This camcorder also supports an SD 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).
This camcorder's memory card type (SDXC) is in fact the best supported memory card type across all small sensor size camcorders that have been available for a similar time to the Legria HF G40.
Across comparable types of camcorder the worst supported memory card type is SD.
SDHC cards are DS cards with a higher capacity of up to 32GB.