Howard Stringer

Sony CEO Howard Stringer faced criticism of his leadership after the consumer electronics giant revealed a second massive security breach.

Sony said it would promote Kazuo Hirai as the head of the company’s biggest division, a realignment that signals he could be a successor to the CEO.

Japan’s Toshiba conceded defeat on Tuesday to rival Sony in a long-running DVD format war, ending consumer confusion but leaving about one million people with expensive machines…