Tucked away in a squat, 1980s-era office park halfway between Washington and Baltimore, 200 digital detectives are scouring the hard drives, MP3 players and compact discs seized from terrorist hide-outs in search of links and clues to their next plans of attack. The craft of unearthing data hidden deep inside computer equipment has become known as “digital forensics.” And the center’s executive director, Steven D. Shirley, predicts it will revolutionize investigations much as DNA did…