EXHIBIT 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



We consent to the  reference  to our firm under the  caption  "Experts"  in Iron
Mountain  Incorporated's  Registration Statement and related Prospectus filed on
or about  January 12,  1998 on Form S-3 and to the  incorporation  by  reference
therein of our reports dated  February 28, 1997 (except for Note 12, as to which
the date is September 26,  1997),  and April 30, 1997 (except for Note 15, as to
which the date is September 26, 1997) with respect to the  financial  statements
of Arcus Technology Services, Inc. and Arcus Group, Inc., respectively, included
in Iron Mountain  Incorporated's  Current  Reports on Form 8-K dated October 30,
1997 and November 25, 1997, filed with the Securities and Exchange Commission.




                                                              Ernst & Young LLP

Dallas, Texas
January 6, 1998