You can usually distinguish between the versions by looking at the physical port on the back or side of the TV:
: Some ports are labeled "HDD 5V 1A" ; these are intended for external hard drives that require more power than a standard flash drive, regardless of the USB version. Samsung TV: How do I Play Media Files in USB Devices? Samsung Smart Tv Usb Version
: Often has a blue plastic tab inside and may be labeled with an "SS" (SuperSpeed) symbol. You can usually distinguish between the versions by