Data Domain Files S1

SANTA CLARA, Calif. -- Data Domain, Inc. today announced it filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission on March 30, 2007, relating to the proposed initial public offering of its common stock. The shares of common stock to be sold in the offering are expected to be offered by Data Domain, Inc. and a selling stockholder.

Goldman, Sachs & Co. and Morgan Stanley will act as joint bookrunning managers and Thomas Weisel Partners LLC and Pacific Crest Securities will act as co-managers for the offering. The number of shares to be sold and the price range for the proposed offering have not yet been determined.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission, but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. Further, this press release does not constitute either an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation, or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Data Domain Inc.