Which of the following refers to a small, portable plug-n-play storage device used for storing files that plugs into a USB port?

The term for a small, portable plug-and-play storage device that connects to a USB port is a USB Drive. This device is commonly used for transferring files between computers and other devices due to its ease of use and portability. USB drives are also known for their relatively large storage capacity compared to other portable storage options.

Unlike a solid-state drive (SSD), which is typically used as an internal storage solution for computers and may have more complex configurations, a USB drive is designed specifically for the quick and convenient transfer of files.

While hard drives can also store files, they are usually larger, not as portable as USB drives, and often require more careful handling. Additionally, a compact disk, such as a CD or DVD, operates on a different principle of data storage and does not have the same plug-and-play functionality as a USB drive; it requires a compatible optical disc drive for reading and writing data.

Therefore, USB Drive accurately describes the device in question as it embodies the characteristics of being small, portable, and easy to use through a USB interface.