Test 4: In The Microwave
Now for a somewhat more extreme test: the metal key was placed in a microwave oven.
Contrary to popular belief, there was no sparking in the microwave from the LaCie USB key, since (quoting Wikipedia) "It is possible for metal objects to be microwave-oven compatible, although experimentation by users is not encouraged. Microwaving an individual smooth metal object without pointed ends, for example, a spoon or shallow metal pan, usually does not produce sparking." And the LaCie key is rounded, with no points or sharp corners.
Verdict: The USB key smelled a little burnt, but worked perfectly.