As filed with the Securities and Exchange Commission on September 26, 1996

                                                 Registration No. 333-       
===============================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  -------------

                                    FORM S-1
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                  -------------

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

   DELAWARE                       4226                           04-3107342
  (State of            (Primary Standard Industrial            (IRS Employer
 incorporation)          Classification Code Number)        Identification No.)

                      745 ATLANTIC AVENUE, BOSTON, MA 02111
                                 (617) 357-4455
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                  -------------

                                C. RICHARD REESE
                       CHAIRMAN OF THE BOARD OF DIRECTORS
                          AND CHIEF EXECUTIVE OFFICER
                           IRON MOUNTAIN INCORPORATED
                              745 Atlantic Avenue
                                Boston, MA 02111
                                 (617) 357-4455
    (Name, address, including zip code, and telephone number, including area
                          code, of agent for service)
                                  -------------

                                   Copies to:

      WILLIAM J. CURRY                             ROBERT A. ZUCCARO
 SULLIVAN & WORCESTER LLP                      JONES, DAY, REAVIS & POGUE
   One Post Office Square                         599 Lexington  Avenue
    Boston, MA 02109                               New York, NY 10022
    (617) 338-2800                                    (212) 326-3939

                                  -------------

   Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effective date of this Registration Statement. If any of
the securities being registered on this Form are to be offered on a delayed or
continuous basis pursuant to Rule 415 under the Securities Act of 1933, check
the following box. [ ]

   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [x] Registration No.
333-10359

   If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

   If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                                -------------



                                         CALCULATION OF REGISTRATION FEE
==============================================================================================================================
    Title of Each Class of         Amount to          Proposed Maximum              Proposed Maximum       
          Securities                   be               Offering                         Aggregate         Aggregate Amount of
       to be Registered            Registered       Price Per Security (1)           Offering Price (1)     Registration Fee
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                                  
  % Senior Subordinated
  Notes due 2006                  $15,000,000            100%                         $15,000,000             $5,173
 -----------------------------------------------------------------------------------------------------------------------------
Guarantees of the   % Senior
  Subordinated Notes due 2006     $15,000,000             (2)                             (2)                    (2)
==============================================================================================================================


(1) Estimated solely for the purpose of calculating the amount of the
registration fee in accordance with Rule 457(a) under the Securities Act of
1933.
(2) Pursuant to Rule 457(n), no separate registration fee is required as no
additional consideration is being paid for Guarantees.

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                             EXPLANATORY STATEMENT

This registration statement is being filed pursuant to Rule 462(b) and
General Instruction V of Form S-1. The contents of Registration Statement No.
333-10359 are hereby incorporated by reference, including, without
limitation, Exhibit 25 thereto.



                                   SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, Iron
Mountain Incorporated has duly caused this registration statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of
Boston, Commonwealth of Massachusetts, on September 26, 1996. 

                                       IRON MOUNTAIN INCORPORATED


                                       By: /s/ David S. Wendell
                                           --------------------------
                                           Name: David S. Wendell
                                           Title: President


   Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement on Form S-1 relating to Iron Mountain Incorporated's
Senior Subordinated Notes and the guarantees thereof has been signed below by
the following persons in the capacities and on the dates indicated. 



          Signature                            Title                          Date
- ----------------------------     -----------------------------------   --------------------
                                                                   
              *                  Chairman of the Board of                September 26, 1996
- ----------------------------     Directors and Chief Executive
      C. Richard Reese           Officer

              *                  President, Chief Operating              September 26, 1996
- ----------------------------     Officer and Director
      David S. Wendell

              *                  Executive Vice President, Chief         September 26, 1996
- ----------------------------     Financial Officer and Director
      Eugene B. Doggett

              *                                                          September 26, 1996
- ----------------------------     Director
     Constantin R. Boden

              *                                                          September 26, 1996
- ----------------------------     Director
      Arthur D. Little

              *                                                          September 26, 1996
- ----------------------------     Director
    Vincent J. Ryan, Jr.

              *                  Vice President and Corporate            September 26, 1996
- ----------------------------     Controller
         Jean A. Bua


*By: /s/ David S. Wendell
     ---------------------
       David S. Wendell
       Attorney-in-Fact


                                      II-1


                                   SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, as amended, Iron
Mountain Records Management, Inc., Metro Business Archives, Inc., Criterion
Atlantic Property, Inc., Criterion Property, Inc., Hollywood Property, Inc., IM
San Diego, Inc., Iron Mountain Information Partners, Inc., Iron Mountain Data
Protection Services, Inc., Iron Mountain Records Management of Maryland, Inc.,
Iron Mountain Records Management of Ohio, Inc., Iron Mountain Wilmington, Inc.,
Data Storage Systems, Inc., Iron Mountain Records Management of Missouri LLC,
Iron Mountain Records Management of Boston, Inc., and Data Archive Services,
Inc. have each duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Boston,
Commonwealth of Massachusetts, on September 26, 1996. 

IRON MOUNTAIN RECORDS MANAGEMENT, INC.
METRO BUSINESS ARCHIVES, INC.
CRITERION ATLANTIC PROPERTY, INC.
CRITERION PROPERTY, INC.
HOLLYWOOD PROPERTY, INC.
IM SAN DIEGO, INC.
IRON MOUNTAIN INFORMATION PARTNERS, INC.
IRON MOUNTAIN DATA PROTECTION
 SERVICES, INC.


IRON MOUNTAIN RECORDS MANAGEMENT OF
 MARYLAND, INC.
IRON MOUNTAIN RECORDS MANAGEMENT OF
 OHIO, INC.
IRON MOUNTAIN WILMINGTON, INC.
DATA STORAGE SYSTEMS, INC.
IRON MOUNTAIN RECORDS MANAGEMENT OF
 MISSOURI LLC
IRON MOUNTAIN RECORDS MANAGEMENT OF
 BOSTON, INC.
DATA ARCHIVE SERVICES, INC.


                                         By: /s/ David S. Wendell
                                             ------------------------------
                                             Name: David S. Wendell
                                             Title:President

   Pursuant to the requirements of the Securities Act of 1933, as amended, this
Registration Statement on Form S-1 relating to Iron Mountain Incorporated's
Senior Subordinated Notes and the guarantees thereof has been signed below by
the following persons in the capacities and on the dates indicated. 



      Signature                        Title                          Date
- --------------------     -----------------------------------   --------------------
                                                            
           *             Chairman of the Board and Director,      September 26, 1996
- ---------------------    and Chief Executive Officer
C. Richard Reese          

*                        Executive Vice President and Chief       September 26, 1996
- ---------------------    Financial Officer, and Manager of
  Eugene B. Doggett      Iron Mountain Records Management  
                         of Missouri, LLC 
                          
          *              Vice President and Corporate             September 26, 1996
- ---------------------    Controller
Jean A. Bua               

*By: /s/ David S. Wendell
     --------------------
       David S. Wendell
       Attorney-in-Fact


                                      II-2


                                    EXHIBITS


Exhibit No.
                                                   
5             Opinion of Sullivan & Worcester LLP        Filed herewith as Exhibit 5
23.1          Consent of Sullivan & Worcester LLP        Contained in Exhibit 5 filed herewith
23.2          Consent of Arthur Andersen LLP             Filed herewith as Exhibit 23.2
23.3          Consent of Wolpoff & Company, LLP          Filed herewith as Exhibit 23.3
23.4          Consent of Morrison and Smith              Filed herewith as Exhibit 23.4
23.5          Consent of Geo. S. Olive & Co. LLC         Filed herewith as Exhibit 23.5
23.6          Consent of Robert F. Gayton, CPA           Filed herewith as Exhibit 23.6
23.7          Consent of Perless, Roth, Jonas &          Filed herewith as Exhibit 23.7
              Hartney, CPAs, PA
23.8          Consent of Rothstein, Kass & Company,      Filed herewith as Exhibit 23.8
              P.C.
24            Powers of Attorney                         Previously filed as an exhibit as part of Registration
                                                         Statement No. 333-10359 and incorporated herein by
                                                         reference
25            Form T-1 stating the eligibility and       Previously filed as an exhibit as part of Registration
              qualification of First Bank National       Statement No. 333-10359 and incorporated herein by
              Association to act as Trustee under        reference
              the Indenture