The GY-HM170 supports a better memory card type than most video cameras of this spec and age. This camcorder supports an SDXC compatible memory cards, whereas most video cameras of a comparable age and type to it support an SDHC compatible 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).
This camcorder's memory card type (SDXC) is actually the best supported memory card type amongst all video cameras of a comparable age and type to the GY-HM170.
The worst supported memory card type amongst similar types of camcorder is SD.
SDHC cards are DS cards with a higher capacity of up to 32GB.