A federal judge has sentenced a former systems administrator for Medco Health Solutions to 30 months in prison Tuesday for planting a “logic bomb” in Medco’s computer systems that was designed to wipe out critical data on more than 70 servers, U.S. Attorney Christopher J. Christie announced. A programming error prevented the bomb from detonating, but Yung-Hsun Lin was also ordered to pay $81,200 in restitution to Medco.