EXHIBIT 5.1



                                 June 30, 1998



Quantum Corporation
500 McCarthy Boulevard
Milpitas, CA  95035

     RE:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 to be filed by you
with the Securities and Exchange Commission on or about June 30, 1998 (the
"Registration Statement"), in connection with the registration under the
Securities Act of 1933, as amended, of 6,435,167 additional shares of your
Common Stock, par value $.01 per share, (the "Shares") reserved for issuance
pursuant to the 1993 Long-Term Incentive Plan (the "Plan").  As your counsel in
connection with the transaction, 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 pursuant to the Plan.

     It is our opinion, when issued and sold in the manner referred to in the
Plan, the Shares will be legally and 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 and any amendment thereto.

                                    Very truly yours,

                                    WILSON, SONSINI, GOODRICH & ROSATI
                                    Professional Corporation