The HDC-SD40 supports an SDXC memory card which is better than most video cameras that have been on the market for around the same time as it. Most small sensor size camcorders that were released more than two years ago support an SD memory card. This Panasonic camcorder also 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 camcorders that have been around for a comparable time to the HDC-SD40.
Across comparable types of camcorder the worst supported memory card type is MicroSD (Transflash).
SDHC cards are DS cards with a higher capacity of up to 32GB.