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Although it is called a drive, the 16 GB USB flash drive does not contain any moving parts. Flash drives are mechanically very sturdy and will resist most bumps and grazes from everyday use.
Inside the flash drive is a simple but powerful small printed circuit board and a USB connector, insulated and protected inside a case, usually made from plastic, metal, or rubber which can be carried in a pocket or on a key chain.
Protection for the USB piece is provided by a cap or by retracting the USB into the body of the drive. USB flash drives draw power from the computer via external USB connection. Most flash drives use a standard type-A USB connection allowing plugging into a port on a personal computer, but drives for other interfaces also exist.