EXHIBIT 5.1

July 27, 2004

Engenio Information Technologies, Inc.
1621 Barber Lane
Milpitas, CA 95035

     RE: REGISTRATION STATEMENT ON FORM S-1

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-1 filed by you with
the Securities and Exchange Commission ("SEC") on February 19, 2004, as amended
(as such may be further amended or supplemented, the "Registration Statement"),
in connection with the registration under the Securities Act of 1933, as
amended, of up to 12,500,000 shares of your Common Stock (the "Shares"). The
Shares include an over-allotment option granted to the underwriters of the
offering to purchase 1,875,000 shares. We understand that the Shares are to be
sold to the underwriters for resale to the public as described in the
Registration Statement and pursuant to the Underwriting Agreement filed as an
exhibit thereto. As your legal counsel, we have examined the proceedings taken,
and are familiar with the proceedings proposed to be taken, by you in connection
with the sale and issuance of the Shares.

     It is our opinion that the Shares, when issued and sold in the manner
described in the Registration Statement, will be validly issued, fully paid and
nonassessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement, including the prospectus constituting a part thereof,
and any amendments thereto.

                                      Very truly yours,

                                      /s/ WILSON SONSINI GOODRICH & ROSATI
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                                      WILSON SONSINI GOODRICH & ROSATI
                                      Professional Corporation