The HC-X900 supports an SDXC memory card which is better than the SD memory card supported by most comparable spec video cameras that have been on the market for a similar time to it. This video camera 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 medium sensor size video cameras that were released around the same time as the HC-X900.
A MicroSDXC memory card is the worst supported memory card type amongst similar types of camcorder.
SDHC cards are DS cards with a higher capacity of up to 32GB.