X0202 4 2007-12-24 0 0001391984 Data Domain, Inc. DDUP 0001237289 SANDELL SCOTT D 1119 ST. PAUL STREET BALTIMORE MD 21202 1 0 1 0 Common Stock 2007-12-24 4 J 0 887648 0 D 10947664 I See Note 1 Common Stock 2007-12-24 4 J 0 8885 0 A 8885 I See Note 3 The Reporting Person is a general partner of NEA Partners 10, Limited Partnership ("NEA Partners 10"), the sole general partner of New Enterprise Associates 10, Limited Partnership ("NEA 10"), which is the beneficial owner of the securities. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the NEA 10 shares in which the Reporting Person has no actual pecuniary interest therein. NEA 10 made a pro rata distribution of an aggregate of 887,648 shares of common stock of the issuer to its partners on December 24, 2007. The Reporting Person is a general partner of NEA Partners 10, which is the beneficial owner of the securities. The Reporting Person disclaims beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the NEA Partners 10 shares in which the Reporting Person has no actual pecuniary interest therein. /s/ Louis Citron, attorney-in-fact 2007-12-26