Storage drives connected by USB devices known otherwise as flash drive, USB stick, USB key and thumb drive. Also includes larger storage devices such as portable hard drives.
USB drives are storage drives connected by USB (Universal Serial Bus) to the computer.
Most common are the small devices known by various names such as flash drive, USB stick, USB key and thumb drive. Use the usb-flash-drive tag for these.
USB drives can also come in larger storage device versions such as portable hard drives.