The HC-X900 supports a better memory card type than most camcorders of this age and type. This camcorder supports an SDXC memory card, whereas most similar spec video cameras that are a comparable 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 actually the best supported memory card type amongst all medium sensor size camcorders that have been around for 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.