Offering removable media provides hypothetically infinite choice, but the lesson of the iPod vs.

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The virus later copies itself onto any other removable media inserted into the infected PC's USB ports, including digital cameras and PDAs.

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Prompted by the spread of the agent.btz worm, last month the Defense Department and the National Aeronautics and Space Administration issued rules prohibiting the use of removable media devices like USB sticks.

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The malicious software "agent.btz, " though aptly-named for a narrative about international espionage, is likely one of many flavors of a particular category of malware that automatically (and silently) executes when removable media is inserted into a Windows machine.

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"I am in the process of updating security policies and am also working with center CIOs on additional measures recommended by US-CERT to mitigate removable media risks, " wrote chief information officer Jonathan Pettus in an e-mail to employees.

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