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
: Typically has a black or white plastic tab inside the connector. You can usually distinguish between the versions by
: Often has a blue plastic tab inside and may be labeled with an "SS" (SuperSpeed) symbol. : Often has a blue plastic tab inside
Most Samsung Smart TVs primarily use ports. While some high-end or newer models may feature USB 3.0 (also known as USB 3.1 Gen 1 or SuperSpeed) for faster data transfer, the majority of standard models rely on the older 2.0 standard, which provides sufficient bandwidth for photo and video playback. How to Identify Your TV's USB Version