A Sony plant in southern New Jersey that once produced millions of CDs and DVDs each month will close on March 31, leaving 300 employees out of work. The demise of both CDs and DVDs has been looming as technology advances, according to David Schuff of Temple's Fox School of Business. "What is happening to DVDs is what happened to CDs few years ago," Schuff said. "Now, just like you can digitize music and transport [it], you can digitize and transport video."