The HDR-CX240 supports an SDXC memory card which is better than the SDHC memory card supported by most video cameras that came out around the same time as it. This Sony camcorder also support a MicroSD (TransFlash) and MS Micro (M2) 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 camcorders of a comparable type and age to the HDR-CX240.
A MicroSDXC memory card is the worst supported memory card type amongst comparable types of camcorder.
SDHC cards are DS cards with a higher capacity of up to 32GB.