A hard drive with seven years of personal and medical information on about 1.5 million Health Net customers was lost six months ago and was first reported Nov. 18, officials said. The insurance company informed the Connecticut attorney general's office and the Department of Insurance of the security breach that puts personal medical records at risk. A portable, external hard drive with Social Security numbers and medical records "disappeared" and is still missing from the insurer's Northeast headquarters, a Health Net spokeswoman said. The hard drive contains Social Security numbers, medical records, and health information dating for 1.5 million customers—past and present—in Arizona, Connecticut, New Jersey, and New York, the spokeswoman said.