The NEX-VG20 supports an SDXC memory card which is better than most big sensor size video cameras that have been available for a similar time to it. Most big sensor size video cameras that have been around for a similar time to it support an SDHC memory card. In addition, this Sony camcorder support MS PRO, MS Pro-HG Duo and MS Pro-HG Duo HX and SD 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 across all camcorders of a similar age and spec to the NEX-VG20.
The worst supported memory card type amongst comparable types of video camera is MS Pro-HG.
SDHC cards are DS cards with a higher capacity of up to 32GB.