-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 R6VGkkRvH8yf1jg0zLU/4puiM5XO/lG76SHvSmpuz24stoFB0Dtf3nLbljKUIIxh
 lCRGui4LdmancFPwJ/eSYw==

<SEC-DOCUMENT>0001179110-05-011619.txt : 20050611
<SEC-HEADER>0001179110-05-011619.hdr.sgml : 20050611
<ACCEPTANCE-DATETIME>20050603132708
ACCESSION NUMBER:		0001179110-05-011619
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050601
FILED AS OF DATE:		20050603
DATE AS OF CHANGE:		20050603

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MCDATA CORP
		CENTRAL INDEX KEY:			0000731502
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATIONS EQUIPMENT, NEC [3669]
		IRS NUMBER:				841421844
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0131

	BUSINESS ADDRESS:	
		STREET 1:		380 INTERLOCKEN CRESCENT
		CITY:			BROOMFIELD
		STATE:			CO
		ZIP:			80021
		BUSINESS PHONE:		3034609200

	MAIL ADDRESS:	
		STREET 1:		380 INTERLOCKEN CRESCENT
		CITY:			BROOMFIELD
		STATE:			CO
		ZIP:			80021

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BEYER ROBERT R
		CENTRAL INDEX KEY:			0001251330

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-31257
		FILM NUMBER:		05876743

	BUSINESS ADDRESS:	
		STREET 1:		6000 NATHAN LANE NORTH
		CITY:			PLYMOUTH
		STATE:			MN
		ZIP:			55442
		BUSINESS PHONE:		7632686000

	MAIL ADDRESS:	
		STREET 1:		6000 NATHAN LANE
		CITY:			PLYMOUTH
		STATE:			MN
		ZIP:			55442
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 3 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-06-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000731502</issuerCik>
        <issuerName>MCDATA CORP</issuerName>
        <issuerTradingSymbol>MCDT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001251330</rptOwnerCik>
            <rptOwnerName>BEYER ROBERT R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MCDATA CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>380 INTERLOCKEN CRESCENT</rptOwnerStreet2>
            <rptOwnerCity>BROOMFIELD</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80021</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP, Customer Support</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11700</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>McDATA Class A Restricted Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19500</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1965</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.48</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>1999-11-09</value>
            </exerciseDate>
            <expirationDate>
                <value>2008-11-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>24375</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.66</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2001-02-11</value>
            </exerciseDate>
            <expirationDate>
                <value>2010-02-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.15</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2001-02-13</value>
            </exerciseDate>
            <expirationDate>
                <value>2002-02-13</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>13000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.70</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2002-04-26</value>
            </exerciseDate>
            <expirationDate>
                <value>2011-04-25</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1878</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.49</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2003-10-07</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-10-06</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>26000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.70</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-04-11</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-04-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>26000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>McDATA Class A Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.40</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2005-01-27</value>
            </exerciseDate>
            <expirationDate>
                <value>2014-01-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>McDATA Class A Stock Options</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>26000</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Restricted Stock Units previously issued, vested as part of acquisition of CNT</footnote>
        <footnote id="F2">Options assumed as part of CNT acquisition.</footnote>
        <footnote id="F3">Restricted stock assumed as part of CNT acquisition.</footnote>
        <footnote id="F4">Conversion of previously held CNT stock</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Robert R. Beyer</signatureName>
        <signatureDate>2005-06-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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