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/ Francis J. Sweeney
Name:	Francis J. Sweeney
Title:	President and Chief Executive Officer
TDK Electronics Corporation a corporation organized under the laws of New York
By:	/s/ James R. Browning
Name:	James R. Browning
Title:	President and Chief Executive Officer
TDK Europe S.A. a corporation organized under the laws of Luxembourg
By:	/s/ Keisuke Igarashi
Name:	Keisuke Igarashi
Title:	Executive Vice President
TDK Recording Media Europe S.A. a corporation organized under the laws of Luxembourg
By:	/s/ Keisuke Igarashi
Name:	Keisuke Igarashi
Title:	Executive Director
TDK Hong Kong Co., Ltd. a corporation organized under the laws of Hong Kong
By:	/s/ Takao Akine
Name:	Takao Akine
Title:	Executive Vice President
TDK Singapore (Pte) Ltd a corporation organized under the laws of Singapore
By:	/s/ Osamu Katsuta
Name:	Osamu Katsuta
Title:	Chief Executive Officer