CERTIFICATE OF INCORPORATION
                                      OF
                IRON MOUNTAIN RECORDS MANAGEMENT OF OHIO, INC.


      FIRST:  The name of the Corporation is Iron Mountain Records Management of
Ohio, Inc.

      SECOND: The address of the Corporation's registered office in the State of
Delaware is 1013 Centre Road in the City of Wilmington, County of New Castle.
The name of the Corporation's registered agent at such address is The
Prentice-Hall Corporation System, Inc..

      THIRD: The nature of the business and purposes to be conducted or promoted
by the Corporation are as follows:

      To engage in any lawful business, act or activity for which corporations
      may be organized under the General Corporation Law of the State of
      Delaware; and to possess and exercise all the powers and privileges
      granted by the General Corporation Law of the State of Delaware or by any
      other law of the State of Delaware or by this Certificate of Incorporation
      together with any powers incidental thereto.

      FOURTH: The total number of shares of capital stock which the Corporation
shall have authority to issue is one thousand (1,000) shares of Common Stock
with par value $0.01 per share.

      FIFTH: The name and mailing address of the sole incorporator is as
follows:

      Name                                Mailing Address

      Beth-Jean McCurdy                   Sullivan & Worcester LLP
                                          One Post Office Square
                                          Boston, Massachusetts 02109

      SIXTH: The name and mailing address of the person who is to serve as sole
director until the first meeting of stockholders, or until his successor is
elected and qualified, which ever first occurs, are as follows:

      Name                                Mailing Address

      C. Richard Reese                    745 Atlantic Avenue, Boston, MA  02111







Certificate of Incorporation of
Iron Mountain Records Management of Ohio, Inc.
Page 2

      SEVENTH: For the management of the business and for the conduct of the
affairs of the Corporation, and in further definition, limitation and regulation
of the powers of its directors and stockholders, it is further provided:

      1.          The number of directors of the Corporation shall be as
                  prescribed in the By-laws of the Corporation but such number
                  may from time to time be increased or decreased in such manner
                  as may be prescribed by the By-laws.

      2.          In furtherance and not in limitation of the powers conferred
                  by the laws of the State of Delaware, the Board of Directors
                  is expressly authorized and empowered:

                  (a) Subject to the applicable provisions of the By-laws then
            in effect, to determine, from time to time, whether and to what
            extent and at what times and places and under what conditions and
            regulations the accounts and books of the Corporation, or any of
            them, shall be open to the inspection of the stockholders, and no
            stockholder shall have any right to inspect any account or document
            of the Corporation, except as conferred by the laws of the State of
            Delaware, unless and until authorized so to do by resolution of the
            Board of Directors or of the stockholders of the Corporation.

                  (b) Without the assent or vote of the stockholders to
            authorize and issue obligations of the Corporation, secured or
            unsecured, to include therein such provisions as to redeemability,
            convertibility or otherwise, as the Board of Directors, in its sole
            discretion, may determine, and to authorize the mortgaging or
            pledging, as security therefor, of any property of the Corporation,
            real or personal, including after-acquired property.

                  (c) To establish a bonus, profit-sharing or other types of
            incentive or compensation plans for the employees (including
            officers and Directors) of the Corporation and to fix the amount of
            profits to be distributed or shared and to determine the persons to
            participate in any such plans and the amounts their respective
            participants.

                  (d) To make, alter, amend or repeal the By-laws of the
            Corporation.

                  (e) To determine for any purpose and in any manner not
            inconsistent with the other provisions of this Certificate of
            Incorporation the amount of the gross assets, of the liabilities, of
            the net assets or of the net profits of the Corporation as the same
            may exist or shall have existed at any time or for any period or
            periods, and to create, increase, abolish or reduce any reserve or
            reserves for accrued, accruing or contingent liabilities or
            expenses, including taxes and other charges.





Certificate of Incorporation of
Iron Mountain Records Management of Ohio, Inc.
Page 3


      In addition to the powers and authorities hereinbefore or by statute
expressly conferred upon it, the Board of Directors may exercise all such powers
and do all such acts and things as may be exercised or done by the Corporation,
subject, nevertheless, to the provisions of the laws of the State of Delaware,
of the Certificate of Incorporation and of the By-laws of the Corporation.

      3.          Any Director or any officer elected or appointed by the
                  stockholders or by the Board of Directors may be removed at
                  any time in such manner as shall be provided in the By-laws of
                  the Corporation.

      4.          In the absence of fraud, no contract or other transaction
                  between the Corporation and any other corporation, and no act
                  of the Corporation, shall in any way be affected or
                  invalidated by the fact that any of the Directors of the
                  Corporation are pecuniarily or otherwise interested in, or are
                  directors or officer of, such other corporation and, in the
                  absence of fraud, any Director may be a member, may be a party
                  to, or may be pecuniarily or otherwise interested in, any
                  contract or transaction of the Corporation; provided, in any
                  case, that the fact that -------- he or such firm is so
                  interested shall be disclosed or shall have been known to the
                  Board of Directors or a majority thereof; and any Director of
                  the Corporation who is also a director or officer of any such
                  other corporation, or who is also interested, may be counted
                  in determining the existence of a quorum at any meeting of the
                  Board of Directors of the Corporation which shall authorize
                  any such contract, act or transaction and may vote thereat to
                  authorize any such contract, act or transaction, with like
                  force and effect as if he were not such director or officer of
                  such corporation, or not so interested.

      5.          Any contract, act or transaction of the Corporation or of the
                  Directors may be ratified by vote of a majority of the shares
                  having voting powers at any meeting of stockholders, or at any
                  special meeting called for such purpose, and such ratification
                  shall, so far as permitted by law and by this Certificate of
                  Incorporation, be as valid and as binding as though ratified
                  by every stockholder of the Corporation.

      6.          No Director of the Corporation shall be liable to any person
                  on account of any action undertaken by him as such director in
                  reliance in good faith upon the existence of any fact or
                  circumstance reported or certified to the Board of Directors
                  by any officer of the Corporation or by any independent
                  auditor, engineer, or consultant retained or employed as such
                  by the Board of Directors.

      7.          Meetings of the stockholders may be held without the State of
                  Delaware, if the By-laws so provide.  The books of the 
                  Corporation may be kept (subject to any statutory provision) 
                  outside the State of





Certificate of Incorporation of
Iron Mountain Records Management of Ohio, Inc.
Page 4

                  Delaware at such place or places as may be from time to time
                  designated by the Board of Directors or in the By-laws of the
                  Corporation.  Elections of directors need not be by ballot 
                  unless the By-laws shall otherwise provide.

      EIGHTH: No director of the Corporation shall be personally liable to the
Corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director; provided, however, that a director of the Corporation shall
be liable for (i) breach of the director's duty of loyalty to the Corporation or
its stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or knowing violation of law, (iii) under section 174 of
Title 8 of the Delaware Code relating to the General Corporation Law of the
State of Delaware, or (iv) for any transaction from which the director derived
an improper personal benefit. If the General Corporation Law of the State of
Delaware is hereafter amended to permit further limitation on or elimination of
the personal liability of the Corporation's directors for breach of fiduciary
duty, then a director of the Corporation shall be exempt from such liability for
any such breach to the full extent permitted by the General Corporation Law of
the State of Delaware as so amended from time to time. Any repeal or
modification of the foregoing provisions of this Article, or the adoption of any
provision inconsistent herewith, shall not adversely affect any right or
protection of a director of the Corporation hereunder in respect of any act or
omission of such director occurring prior to such repeal, modification or
adoption of an inconsistent provision.

      NINTH: The stockholders of the Corporation shall not be personally liable
for the payment of the Corporation's debts.

      TENTH: Each person who is or was or had agreed to become a director or
officer of the Corporation or who is or was serving or who had agreed to serve
at the request of the Board of Directors or an officer of the Corporation as an
employee or agent of the Corporation or as a director, officer, partner, member,
trustee, administrator, employee or agent of another corporation, partnership,
joint venture, limited liability company, trust or other enterprise (including
without limitation any employee benefit plan or any trust associated therewith),
shall be indemnified by the Corporation to the full extent permitted from time
to time by the Delaware General Corporation Law or any other applicable laws as
presently or hereafter in effect. This Article shall inure to the benefit of
each such person and his or her heirs, executors, administrators and estate.
Without limiting the generality or the effect of the foregoing, the Corporation
may enter into one or more agreements with any person which provide for
indemnification greater or different than that provided in this Article. Neither
the amendment nor repeal of this Article nor the adoption of any provision of
this Certificate of Incorporation inconsistent with this Article shall reduce,
eliminate or adversely affect any right or protection hereunder of any person in
respect of any act or omission occurring prior to the effectiveness of such
amendment, repeal or adoption.

      ELEVENTH: From time to time any of the provisions of this Certificate of
Incorporation may be amended, altered or repealed, and other provisions
authorized by the 





Certificate of Incorporation of
Iron Mountain Records Management of Ohio, Inc.
Page 5
laws of the State of Delaware at the time in force may be
added or inserted in the manner and at the time prescribed by said laws, and all
rights at any time conferred upon the stockholders of the Corporation by this
Certificate of Incorporation are granted subject to the provisions of this
Article ELEVENTH.

      IN WITNESS WHEREOF, I have hereunto set my hand on September 12, 1996.


                                          /s/ Beth-Jean McCurdy
                                          Beth-Jean McCurdy
                                          Sole Incorporator