The missing Bank of New York Mellon computer tape reported last week contained information about nearly 500,000 Connecticut residents from a large number of companies, said state officials, who identified 25 of the companies on Friday.

New York Mellon, which was responsible for the tape, has upped its fraud protection offer from one year to two years. The company has agreed to provide two years of free credit monitoring, including $25,000 in identify theft insurance and free credit freezes to people affected by either security breach.

New York Mellon had been under pressure from Attorney General Richard Blumenthal and other Connecticut officials to boost its protection offer. Among the 497,333 Connecticut residents affected, 403,894 were depositors of People's United Bank, which said last week it is relying on New York Mellon to notify its depositors.

Other companies affected were John Hancock Financial Services Inc., 33,586 shareholders; and The Walt Disney Co., 18,361 shareholders. The rest had fewer than 10,000 Connecticut residents.

The list of companies was provided by New York Mellon and released by Blumenthal and Jerry Farrell Jr., commissioner of the Department of Consumer Protection.

The unencrypted computer tape was lost Feb. 27 by a third-party courier, which was transporting it on behalf of Mellon's Shareowner Services business. Mellon did not inform People's of the loss until earlier this month.