The HDR-PJ420 supports a better memory card type than most similar spec video cameras that are a comparable age to it. This Sony camcorder supports an SDXC memory card, whereas most comparable spec camcorders that came out around the same time as it support an SD memory card. In addition, this video camera support MS PRO, MS PRO Duo and MS Pro-HG Duo and SDHC memory cards. 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 video cameras of this age and type.
Amongst similar types of video camera the worst supported memory card type is MicroSDXC.
SDHC cards are DS cards with a higher capacity of up to 32GB.