SCHEDULE 13G/A

(Rule 13d-102)

Under the Securities Exchange Act of 1934
(Amendment No. 11)*

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

                (1)  This figure consists of (a) 26,611 shares of Iron Mountain Incorporated (“Iron Mountain”) Common Stock, $.01 par value (“Iron Mountain Common Stock”) held directly by Mr. Ryan and acquired pursuant to an option exercise on January 21, 2011; (b) 6,406,011 shares of Iron Mountain Common Stock held by the Vincent J. Ryan Revocable Trust, dated December 24, 1987 (the “Ryan 1987 Trust”); (c) 102,355 shares of Iron Mountain Common Stock held by the Carla E. Meyer Revocable Trust dated December 7, 2001 (the “Meyer 2001 Trust”); (d) 5,565 shares of Iron Mountain Common Stock held by the Carla E. Meyer 2008 Three-Year Retained Annuity Trust, dated October 29, 2008 (the “Meyer 2008 Trust”); (e) 9,234,256 shares of Iron Mountain Common Stock held by Schooner Capital Corporation (“Schooner Corporation”); (f) 42,562 shares of Iron Mountain Common Stock that Mr. Ryan has the right to acquire pursuant to currently exercisable options or options that become exercisable within 60 days of execution of this Schedule 13G; (g) 13,383 shares of Iron Mountain Common Stock registered in the name of The Schooner Foundation; and (h) 28,350 shares of Iron Mountain Common Stock registered in the name of Citibank, South Dakota, Trustee of the Ryan 1998 Issue Trust, all of which are deemed to be beneficially owned by Mr. Ryan, as set forth below.

                As a result of a deferred compensation arrangement between Schooner Corporation, as assignee of Schooner Capital LLC (“Schooner”), and C. Richard Reese, Mr. Reese shares beneficial ownership of 2,950,590 shares of Iron Mountain Common Stock with Schooner Corporation. The deferred compensation arrangement relates to earlier services by Mr. Reese as President of Schooner; such arrangement was amended as of December 26, 2008.  Pursuant to such arrangement, Mr. Reese is entitled to receive benefits equivalent to the fair market value of 2,950,590 shares of Iron Mountain Common Stock with payments to Mr. Reese commencing on the first business day of 2013 and payable in ten annual installments; however, Mr. Reese has the right to defer the commencement of such installments in certain circumstances.  In addition, any unpaid benefits pursuant to this arrangement shall be payable to Mr. Reese’s beneficiary(ies) in a lump sum upon his death.  Benefits pursuant to this arrangement are payable in cash or, at Mr. Reese’s election, Iron Mountain Common Stock.  Schooner Corporation has agreed to vote the shares of Iron Mountain Common Stock subject to such arrangement at the direction of Mr. Reese.  Mr. Ryan and Schooner Corporation share voting power and dispositive power with each other with respect to only 6,283,666 of the shares of Iron Mountain Common Stock held by Schooner Corporation.  Mr. Ryan and Schooner Corporation also share dispositive power with respect to 2,950,590 shares of Iron Mountain Common Stock held by Schooner Corporation pursuant to the terms of the deferred compensation arrangement described above.  Mr. Ryan is deemed to have shared voting and dispositive power over the shares held by the Meyer 2001 Trust, the Meyer 2008 Trust, the Schooner Foundation and the Ryan 1998 Issue Trust.

                (2)  This percentage has been calculated based on 172,242,500 shares outstanding as of December 31, 2011.

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(3)  See Footnote 1, above.

(4)  This percentage has been calculated based on 172,242,500 shares outstanding as of December 31, 2011.

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(5)  See Footnote 1, above.

(6)  See Footnote 1, above.

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SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

The original statement shall be signed by each person on whose behalf the statement is filed or his authorized representative.  If the statement is signed on behalf of a person by his authorized representative other than an executive officer or general partner of the filing person, evidence of the representative’s authority to sign on behalf of such person shall be filed with the statement, provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference.  The name and any title of each person who signs the statement shall be typed or printed beneath his signature.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See Section 240.13d-7 for other parties for whom copies are to be sent.

Attention:  Intentional misstatements or omissions of fact
constitute Federal criminal violations (see 18 U.S.C. 1001).

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EXHIBIT INDEX

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EXHIBIT 99(a)

JOINT FILING AGREEMENT

The undersigned hereby agree that the Schedule 13G with respect to the Common Stock, $.01 par value, of Iron Mountain Incorporated, dated as of February 14, 2012, is, and any amendments thereto (including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

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