WESTLAKE VILLAGE, Calif.--(BUSINESS WIRE)--Qualstar Corporation (NASDAQ:QBAK), a publicly traded company and manufacturer of data storage solutions and high-efficiency power supplies, announced today that as of May 15, 2015, Daniel K. Jan has been promoted to President of the Company after having served as Executive Vice President since April 2014. Steven N. Bronson stepped down as President and shall remain the Chief Executive Officer of the Company. “In the past year, Qualstar has demonstrate