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	UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549

	SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 5)*

McData Corporation

(Name of Issuer)

Class B Common Stock, Par Value $0.01 per share

(Title of Class of Securities)

580031 10 2

(CUSIP Number)

December 31, 2004

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o	Rule 13d-1(b)
o	Rule 13d-1(c)
ý	Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 580031 10 2

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) John F. McDonnell

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		o
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization United States of America

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 220,000 shares of Class B Common Stock (includes 220,000 shares of Class B Common Stock issuable upon exercise of options exercisable within 60 days of December 31, 2004).

			6.		Shared Voting Power 0 shares

			7.		Sole Dispositive Power 220,000 shares of Class B Common Stock (includes 220,000 shares of Class B Common Stock issuable upon exercise of options exercisable within 60 days of December 31, 2004).

			8.		Shared Dispositive Power 0 shares

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person 220,000 shares of Class B Common Stock (includes 220,000 shares of Class B Common Stock issuable upon exercise of options exercisable within 60 days of December 31, 2004).

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) 0.58%

	12.	Type of Reporting Person (See Instructions) IN

Item 1.
	(a)	Name of Issuer McData Corporation
	(b)	Address of Issuer's Principal Executive Offices 380 Interlocken Crescent, Suite 700, Broomfield, CO 80021

Item 2.
	(a)	Name of Person Filing John F. McDonnell
	(b)	Address of Principal Business Office or, if none, Residence 22545 Tree Top Lane, Golden, CO 80401
	(c)	Citizenship United States of America
	(d)	Title of Class of Securities Common Stock
	(e)	CUSIP Number 580031 10 2

Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: Not Applicable.
	(a)	o	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
	(b)	o	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	o	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	o	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
	(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
	(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
	(g)	o	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
	(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	o	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	o	Group, in accordance with §240.13d-1(b)(1)(ii)(J).

Item 4.	Ownership
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
	(a)	Amount beneficially owned: 220,000 shares of Class B Common Stock (includes 220,000 shares of Class B Common Stock issuable upon exercise of options exercisable within 60 days of December 31, 2004).
	(b)	Percent of class: 0.58%
	(c)	Number of shares as to which the person has:
		(i)	Sole power to vote or to direct the vote 220,000 shares of Class B Common Stock (includes 220,000 shares of Class B Common Stock issuable upon exercise of options exercisable within 60 days of December 31, 2004).
		(ii)	Shared power to vote or to direct the vote None
		(iii)	Sole power to dispose or to direct the disposition of 220,000 shares (includes 220,000 shares issuable upon exercise of options exercisable within 60 days of December 31, 2004).
		(iv)	Shared power to dispose or to direct the disposition of None

Item 5.	Ownership of Five Percent or Less of a Class
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ý.

Item 6.	Ownership of More than Five Percent on Behalf of Another Person
Not Applicable

Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person
Not Applicable

Item 8.	Identification and Classification of Members of the Group
Not Applicable

Item 9.	Notice of Dissolution of Group
Not Applicable

Item 10.	Certification

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

	February 11, 2005
	Date
	/s/ John F. McDonnell
	Signature
	John F. McDonnell
	Name/Title

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative. If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative's authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations
(See 18 U.S.C. 1001)