I don't recall where I red the story of people implanting tiny magnets under the skin of a finger tip. But I did find it interesting that they quickly developed a sense for magnetic fields, like from live wires. And if I were an electrician I'd get one of those.
"People who have rare earth magnets implanted in their fingers...a finger that feels electromagnetic fields along with the normal sense of touch."
"Appliance cords in the United States give off a 60-Hz field, a sensation with which Huffman has become intimately familiar. "It is a light, rapid buzz," he says."
Sounds really interesting, although the obvious health risks keep me from considering it myself.
A more interesting (to me) and less dangerous was a belt with an array of motors and an internal compass such that there was always a light buzz from the North. Apparently after wearing it for a few weeks you develop an uncanny sense of direction.
But a USB drive?