X0303 4 2010-04-23 0 0000889930 OVERLAND STORAGE INC OVRL 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2010-04-23 4 C 0 3224329 A 3224329 I By Limited Partnerships Series A Convertible Preferred Stock 2010-04-23 4 C 0 566665 0 D Common Stock 3224329 0 I By Limited Partnerships All outstanding shares of Series A convertible preferred stock automatically converted into shares of common stock following receipt of shareholder approval of the full conversion of the outstanding shares of Series A convertible preferred stock into shares of common stock at the special meeting of shareholders held on April 23, 2010 (the Special Meeting). This is a joint filing by Austin W. Marxe (Marxe) & David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Private Equity Fund, L.P. (PE), Special Situations Technology Fund, LP (Tech) & Special Situations Technology II, Fund, L.P. (Tech II), respectively. 1,327,667 shares of Common Stock are held by QP, 948,331 shares of Common Stock are held by PE, 132,765 shares of Common Stock held by Tech & 815,566 shares of Common Stock held by Tech II. The interest of Marxe and Greenhouse in the shares of Preferred Stock owned by QP, PE, Tech, and Tech II is limited to the extent of his pecuniary interest. Austin W. Marxe 2010-04-29 David M. Greenhouse 2010-04-29