The Apple USB SuperDrive.  Released after Apple began to move away from including internal DVD drives in their computers, this external DVD drive works with USB but requires a port with a higher power rating.
<a href="//commons.wikimedia.org/wiki/User:Evan-Amos" title="User:Evan-Amos">Evan-Amos</a>
<span class="int-own-work" lang="en">Own work</span>