An undated file picture shows a technician holding up a damaged computer hard drive at the office of a German-based firm Convar, a world leader in data retrieval. Computer experts at Convar in the southwestern town of Pirmasens use a pioneering laser scanning technology to retrieve data on damaged hard drives and main frames found in the rubble of New York's World Trade Center, to unlock the truth behind an unexplained surge in financial transactions made just before two hijacked planes crashed into the WTC on September 11. —REUTERS