Exhibit 99.1

Investor Relations Contact:

Rod Cooper (408.658.1099)

rod.j.cooper@seagate.com

SEAGATE TECHNOLOGY REPORTS FISCAL FOURTH QUARTER
AND YEAR-END 2011 FINANCIAL RESULTS

Demand for disk drive storage continues to grow as quarterly shipments reach a record 52 million units and fiscal year shipments increase to a record 199 million units

CUPERTINO, CA — July 20, 2011 — Seagate Technology plc (NASDAQ: STX) today reported financial results for the quarter ended July 1, 2011. The company shipped 52 million disk drives and reported revenue of $2.9 billion, gross margin of 19.3%, net income of $119 million and diluted earnings per share of $0.27. On a non-GAAP basis, which excludes the net impact of restructuring, write-down of an equity investment, gain on the sale of one of its facilities, and expenses related to the previously announced transaction with Samsung, Seagate reported net income of $126 million and diluted earnings per share of $0.28 for the quarter ended July 1, 2011.

For the fiscal year ended July 1, 2011, the company reported revenue of $11.0 billion, gross margin of 19.6%, net income of $511 million and diluted earnings per share of $1.09. On a non-GAAP basis, which excludes the net impact of loss on redemption of debt, purchased intangibles amortization, restructuring, write-down of an equity investment, gain on the sale of one of its facilities, expenses related to the previously announced transaction with Samsung and tax adjustments related to prior fiscal years, Seagate reported net income of $578 million and diluted earnings per share of $1.24. Additionally, Seagate returned $77 million to shareholders in the form of a dividend and repurchased $822 million of Seagate ordinary shares.

“Seagate and the industry are benefitting from the significant demand for storage related to new applications and architectures associated with mobile and connected devices,” said Steve Luczo, Seagate chairman, president and CEO. “Because hard disk drive storage is a fundamental technology for cloud service providers, data centers and all other network-based content providers, total industry demand grew almost 40% in fiscal year 2011 to 330 million terabytes. For the June quarter, Seagate’s average capacity per drive shipped grew to

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Seagate Technology Reports Fiscal Fourth Quarter and Year-End 2011 Results

approximately 590GB an increase of 39% year-over-year. As more online content and services become available to billions of connected mobile devices, we expect demand for storage capacity to continue to grow and Seagate to benefit from this growth.”

For reconciliation of non-GAAP to GAAP results, see accompanying financial tables.

Investor Communications

Seagate will hold a conference call to review its fourth fiscal quarter and year-end results today at 2:00 p.m. Pacific Time. The conference call will consist of opening comments from Steve Luczo, CEO, followed by a question and answer session with the executive management team. During today’s conference call, the company will provide an outlook for its first fiscal quarter of 2012, including key underlying assumptions.

Seagate has issued a Supplemental Commentary document. The Supplemental Commentary will not be read during today’s call, but rather it is available in the investor relations section of seagate.com.

Dividend

The Board of Directors has approved a quarterly cash dividend of $0.18 per share which will be payable on August 26, 2011 to shareholders of record as of the close of business on August 5, 2011. The payment of any future quarterly dividends will be at the discretion of the Board and will be dependent upon Seagate’s financial position, results of operations, available cash, cash flow, capital requirements and other factors deemed relevant by the Board.

Conference Call

The conference call can be accessed online at http://www.seagate.com/investors or by telephone as follows:

USA:  (866) 356-3377

International:  (617) 597-5392

Participant Passcode:  85406145

Replay

A replay will be available beginning today at approximately 6:00 p.m. Pacific Time. The replay can be accessed from seagate.com.

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About Seagate

Seagate is the world leader in hard disk drives and storage solutions. Learn more at seagate.com.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. When used, the words “anticipates”, “believes”, “expects”, “may”, “should” and similar expressions are intended to identify such forward-looking statements. These forward-looking statements are based on information available to the Company as of the date of this press release. Current expectations, forecasts and assumptions involve a number of risks, uncertainties, and other factors that could cause actual results to differ materially from those anticipated by these forward-looking statements. Such risks, uncertainties, and other factors may be beyond the Company’s control. In particular, global economic conditions may pose a risk to the Company’s operating and financial performance. Such risks and uncertainties also include the impact of variable demand; dependence on the Company’s ability to successfully qualify, manufacture and sell its disk drive products in increasing volumes on a cost-effective basis and with acceptable quality, particularly the new disk drive products with lower cost structures; the impact of competitive product announcements; and the Company’s ability to achieve projected cost savings. Information concerning risks, uncertainties and other factors that could cause results to differ materially from those projected in the forward-looking statements is contained in the Company’s Annual Report on Form 10-K, Form 10-K/A and Quarterly Reports on Form 10-Q as filed with the U.S. Securities and Exchange Commission on August 20, 2010, October 6, 2010, November 3, 2010, February 3, 2011 and May 3, 2011, respectively, which statements are incorporated into this press release by reference. These forward-looking statements should not be relied upon as representing the Company’s views as of any subsequent date and the Company undertakes no obligation to update forward-looking statements to reflect events or circumstances after the date they were made.

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions)

(Unaudited)

(a) The information in this column was derived from the Company’s audited Consolidated Balance Sheet as of July 2, 2010.

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per share data)

(Unaudited)

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

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Use of non-GAAP financial information

To supplement the condensed consolidated financial statements presented in accordance with generally accepted accounting principles (GAAP), the Company provides non-GAAP measures of net income and diluted net income per share, which are adjusted from results based on GAAP to exclude certain expenses, gains and losses. These non-GAAP financial measures are provided to enhance the user’s overall understanding of the Company’s current financial performance and its prospects for the future. Specifically, the Company believes non-GAAP results provide useful information to both management and investors as these non-GAAP results exclude certain expenses, gains and losses that the Company believes are not indicative of its core operating results and because it is consistent with the financial models and estimates published by financial analysts who follow the Company.

These non-GAAP results are some of the primary measurements management uses to assess the Company’s performance, allocate resources and plan for future periods. Reported non-GAAP results should only be considered as supplemental to results prepared in accordance with GAAP, and not considered as a substitute for, or superior to, GAAP results. These non-GAAP measures may differ from the non-GAAP measures reported by other companies in the Company’s industry.

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SEAGATE TECHNOLOGY PLC

ADJUSTMENTS TO GAAP NET INCOME AND DILUTED NET INCOME PER SHARE

(In millions, except per share amounts)

(Unaudited)

(A)  The fiscal year ended July 1, 2011, included a loss upon the partial redemption of the Company’s 10.00% Senior Secured Second-Priority Notes due 2014, the loss upon redemption of its 5.75% Subordinated Debentures due March 2012 and its 2.375% Convertible Senior Notes due August 2012.

(B)  For the three months and fiscal year ended July 1, 2011, the Company recorded restructuring charges associated with previously announced restructuring activities.

(C)  The fiscal year ended July 1, 2011, amortization of purchased intangible assets acquired in acquisitions was allocated as follows:

(D)  For the three months and fiscal year ended July 1, 2011, the Company recorded costs associated with the pending acquisition of certain assets of Samsung Electronics Co., Ltd.

(E)   To exclude the gain on the sale of a facility, which was allocated as follows:

(F)   For the three months and fiscal year ended July 1, 2011, the Company recorded a write-down of investment in equity securities.

(G)  To exclude the tax effects, where applicable, of adjustments to GAAP net income. In the fiscal year ended July 1, 2011, the Company recorded discrete tax charges of approximately $14 million primarily as a result of information obtained during the March quarter related to ongoing negotiations with non-U.S. tax authorities on tax positions taken in prior fiscal years.

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