Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported): June 19, 2002

                           IRON MOUNTAIN INCORPORATED
             (Exact name of registrant as specified in its charter)

       Pennsylvania                      1-13045                 23-2588479
(State or other jurisdiction           (Commission             (IRS Employer
     of incorporation)                 File Number)          Identification No.)

                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
          (Address of principal executive offices, including zip code)

                                 (617) 535-4766
              (Registrant's telephone number, including area code)

Item 4.  Changes in Registrant's Certifying Accountant

         On June 19, 2002, Iron Mountain  Incorporated (the "Company") dismissed
Arthur Andersen LLP ("Arthur  Andersen") as its independent  public  accountants
and engaged  Deloitte & Touche LLP  ("Deloitte") to serve as its new independent
public  accountants  for the fiscal year ending  December  31,  2002,  effective
immediately.  The decision to dismiss Arthur Andersen and to retain Deloitte was
recommended  by the  Company's  Audit  Committee  and approved by the  Executive
Committee of the Board of Directors, which committee was expressly authorized to
take such action.

         Arthur  Andersen's  reports  on the  Company's  consolidated  financial
statements  for  each of the  years  ended  December  31,  2001 and 2000 did not
contain an adverse  opinion or a disclaimer of opinion,  nor were they qualified
or modified as to uncertainty, audit scope or accounting principles.

         During the years ended  December 31, 2001 and 2000 and through the date
hereof,  there were no disagreements  between the Company and Arthur Andersen on
any  matter  of  accounting   principles  or  practices,   financial   statement
disclosure, or auditing scope or procedure, which disagreements, if not resolved
to Arthur  Andersen's  satisfaction,  would have caused Arthur  Andersen to make
reference to the subject matter in connection  with its reports on the Company's
consolidated  financial  statements for such years; and there were no reportable
events as defined in Item 304(a)(1)(v) of Regulation S-K.

         The  Company  provided  Arthur  Andersen  with a copy of the  foregoing
disclosures.  Attached as Exhibit  16.1 is a copy of Arthur  Andersen's  letter,
dated June 19, 2002, stating its agreement with such statements.

         During the years ended  December 31, 2001 and 2000 and through the date
hereof,  the  Company  did  not  consult  with  Deloitte  with  respect  to  the
application  of  accounting  principles  to  a  specified  transaction,   either
completed  or proposed,  or the type of audit  opinion that might be rendered on
the  Company's  consolidated  financial  statements,  or any  other  matters  or
reportable events as set forth in Items 304(a)(2)(i) and (ii) of Regulation S-K.

Item 7.  Financial Statements, Pro Form Financial Information and Exhibits

(c)      Exhibits.

Exhibit No.    Item

16.1           Letter from Arthur  Andersen LLP to the  Securities  and Exchange
               Commission,  dated  June 19,  2002,  regarding  the change in the
               Company's certifying accountant.

99.1           Press Release, dated June 19, 2002.



         Pursuant to the requirements of the Securities Exchange Act of 1934, as
amended,  the  registrant has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.

                                  IRON MOUNTAIN INCORPORATED

                                  By:  /s/ Jean A. Bua
                                      Jean A. Bua
                                      Vice President and Corporate Controller

Date:   June 19, 2002