Joint Filing Agreement

EXHIBIT 99.B

Joint Filing Agreement

Pursuant to Rule 13d-1(k)(1)(iii) of Regulation 13D-G of the Rules and Regulations of the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, the undersigned agree that the attached Schedule 13D is, and any future amendments thereto may be, filed on behalf of each of us.

Dated: August 10, 2007

		TDK Corporation a corporation organized under the laws of Japan
		By:		/s/ Shiro Nomi
		Name:		Shiro Nomi
		Title :		Senior Vice President
		TDK U.S.A. Corporation a corporation organized under the laws of New York
		By:		/s/ Xxxxxxx X. Xxxxxxx
		Name:		Xxxxxxx X. Xxxxxxx
		Title:		President and Chief Executive Officer
		TDK Electronics Corporation a corporation organized under the laws of New York
		By:		/s/ Xxxxx X. Xxxxxxxx
		Name:		Xxxxx X. Xxxxxxxx
		Title:		President and Chief Executive Officer
		TDK Europe S.A. a corporation organized under the laws of Luxembourg
		By:		/s/ Xxxxxxx Xxxxxxxx
		Name:		Xxxxxxx Xxxxxxxx
		Title:		Executive Vice President
		TDK Recording Media Europe S.A. a corporation organized under the laws of Luxembourg
		By:		/s/ Xxxxxxx Xxxxxxxx
		Name:		Xxxxxxx Xxxxxxxx
		Title:		Executive Director
		TDK Hong Kong Co., Ltd. a corporation organized under the laws of Hong Kong
		By:		/s/ Xxxxx Xxxxx
		Name:		Xxxxx Xxxxx
		Title:		Executive Vice President
		TDK Singapore (Pte) Ltd a corporation organized under the laws of Singapore
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Chief Executive Officer