The HMX-Q20 supports a better memory card type than most comparable spec camcorders that have been on the market for around the same time as it. This camcorder supports an SDXC memory card, whereas most video cameras of a similar spec and age to it support an SDHC memory card. This video camera 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).
An SDXC memory card is in fact the best supported memory card type across all camcorders that have been available for a comparable time to the HMX-Q20.
A MicroSDXC memory card is the worst supported memory card type across similar types of video camera.
SDHC cards are DS cards with a higher capacity of up to 32GB.