X0303 4 2011-06-24 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 2011-06-24 4 S 0 1300 2.78 D 3195399 I By Limited Partnerships This is a weighted average price. 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. 1,315,445 shares of Common Stock are held by QP, 939,928 shares of Common Stock are held by PE, 131,602 shares of Common Stock held by Tech & 808,424 shares of Common Stock held by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, PE, Tech, and Tech II is limited to the extent of his pecuniary interest. Austin W. Marxe 2011-06-28 David M. Greenhouse 2011-06-28