EXHIBIT 23.5
 
              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
   
  We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated April 28, 1998, except for the third paragraph of
Note 8, as to which the date is August 21, 1998, included in the Proxy
Statement of ATL Products, Inc. that is made a part of Amendment No. 1 to the
Registration Statement (Form S-4) and Prospectus of Quantum Corporation for
the registration of 18,000,000 shares of its common stock to be filed with the
Securities and Exchange Commission on or about August 21, 1998.     
 
                                          /s/ Ernst & Young LLP
 
Orange County, California
   
August 21, 1998