The Zoom Q4n supports an SDXC memory card which is better than most video cameras that are a similar age to it. Most similar spec camcorders that are a comparable age to it support an SDHC memory card. In addition, this video camera 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).
An SDXC memory card is in fact the best supported memory card type across all small sensor size camcorders that came out in the last year.
An SD memory card is the worst supported memory card type across similar types of camcorder.
SDHC cards are DS cards with a higher capacity of up to 32GB.