The Zoom Q4n supports an SDXC memory card which is better than most small sensor size video cameras that came out in the last 12 months. Most small sensor size video cameras that have been available for a similar time to it 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 in fact the best supported memory card type amongst all small sensor size video cameras that came out in the last year.
Amongst 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.