-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 TDm8R3jQOvLkwYnpgGmH0FqI0UZOzUPe9ALdpqpjn5Ffbybm0VZgR92BbgyOOLxC
 c3JzQTJNHcprK3J1gRbmoQ==

<SEC-DOCUMENT>0001181431-09-036078.txt : 20090722
<SEC-HEADER>0001181431-09-036078.hdr.sgml : 20090722
<ACCEPTANCE-DATETIME>20090722170233
ACCESSION NUMBER:		0001181431-09-036078
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090720
FILED AS OF DATE:		20090722
DATE AS OF CHANGE:		20090722

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Data Domain, Inc.
		CENTRAL INDEX KEY:			0001391984
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		IRS NUMBER:				943412175
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2421 MISSION COLLEGE BLVD
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054
		BUSINESS PHONE:		(408) 980-4800

	MAIL ADDRESS:	
		STREET 1:		2421 MISSION COLLEGE BLVD
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			EMC CORP
		CENTRAL INDEX KEY:			0000790070
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33517
		FILM NUMBER:		09957547

	BUSINESS ADDRESS:	
		STREET 1:		176 SOUTH STREET
		CITY:			HOPKINTON
		STATE:			MA
		ZIP:			01748-9103
		BUSINESS PHONE:		5082937208

	MAIL ADDRESS:	
		STREET 1:		176 SOUTH STREET
		CITY:			HOPKINTON
		STATE:			MA
		ZIP:			01748-9103
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd248879.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-07-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001391984</issuerCik>
        <issuerName>Data Domain, Inc.</issuerName>
        <issuerTradingSymbol>DDUP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000790070</rptOwnerCik>
            <rptOwnerName>EMC CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>176 SOUTH STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HOPKINTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01748</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2009-07-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1821924</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>33.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>55304278</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2009-07-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>977815</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>33.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>56282093</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On July 8, 2009, EMC Corporation, a Massachusetts corporation (&quot;EMC&quot;), Envoy Merger Corporation, a Delaware corporation (&quot;Purchaser&quot;) and a wholly owned subsidiary of EMC and Data Domain, Inc., a Delaware corporation (the &quot;Company&quot;), entered into an Agreement and Plan of Merger (the &quot;Merger Agreement&quot;).  As previously announced and as contemplated by the terms of the Merger Agreement, Purchaser commenced, on June 2, 2009, a cash tender offer (the &quot;Offer&quot;) to purchase all outstanding shares (the &quot;Shares&quot;) of common stock, par value $0.0001 per Share, of the Company, at a price of $33.50 per Share, net to the seller in cash, and subject to the terms and conditions set forth in the Offer to Purchase, dated June 2, 2009, as amended, included as an exhibit to the Tender Offer Statement on Schedule TO filed by EMC and Purchaser with the Securities and Exchange Commission (the &quot;SEC&quot;) on June 2, 2009.</footnote>
        <footnote id="F2">The initial offering period expired at 12:00 midnight, New York City time, on Friday, July 17, 2009. An aggregate of 50,947,657 Shares were validly tendered and not withdrawn (not including certain shares tendered under guaranteed delivery procedures) in the initial offering period.  On July 20, 2009, Purchaser accepted for payment all validly tendered and not withdrawn Shares.  Also on July 20, 2009, EMC and Purchaser commenced a subsequent offering period (the &quot;Subsequent Offering Period&quot;), which, unless extended, will expire at 12:00 midnight, New York City time, on Wednesday, July 22, 2009. Prior to the commencement of the Offer, on May 29, 2009 and June 1, 2009, Woodland Street Partners, Inc., a Delaware corporation (&quot;Woodland&quot;), and a wholly owned subsidiary of EMC, acquired 2,534,697 Shares through ordinary brokerage transactions at prevailing market prices.</footnote>
        <footnote id="F3">Shares acquired by Purchaser during the Subsequent Offering Period.</footnote>
        <footnote id="F4">Includes Shares acquired by Purchaser during the Subsequent Offering Period as of the date of the reported acquisition.</footnote>
        <footnote id="F5">Purchaser is a direct, wholly owned subsidiary of EMC and is the owner of the Shares purchased in the Offer.  Woodland is a direct, wholly owned subsidiary of EMC and is the owner of the 2,534,697 Shares acquired through ordinary brokerage transactions at prevailing market prices prior to the commencement of the Offer.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Paul T. Dacier, Executive Vice President and General Counsel</signatureName>
        <signatureDate>2009-07-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----