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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

FORM 10-Q

x      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended December 30, 2011

o         TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from:                 to                

Commission File Number 001-31560

SEAGATE TECHNOLOGY PUBLIC LIMITED COMPANY

(Exact name of registrant as specified in its charter)

38/39 Fitzwilliam Square

Dublin 2, Ireland

(Address of principal executive offices)

Telephone:  (353) (1) 234-3136

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes o  No x

As of January 25, 2012, 448,725,600 shares of the registrant’s ordinary shares, par value $0.00001 per share, were issued and outstanding.

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INDEX

SEAGATE TECHNOLOGY PLC

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PART I

FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

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 1, 2011.

See Notes to Condensed Consolidated Financial Statements.

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In millions, except per share data)

(Unaudited)

See Notes to Condensed Consolidated Financial Statements.

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

See Notes to Condensed Consolidated Financial Statements.

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SEAGATE TECHNOLOGY PLC

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY

For the Six Months Ended December 30, 2011

(In millions)

(Unaudited)

See Notes to Condensed Consolidated Financial Statements.

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1.  Basis of Presentation and Summary of Significant Accounting Policies

Organization

The Company designs, manufactures, markets and sells hard disk drives.  Hard disk drives, which are commonly referred to as disk drives or hard drives, are used as the primary medium for storing electronic data. The Company produces a broad range of disk drive products addressing enterprise applications, where its products are primarily used in enterprise servers, mainframes and workstations; client compute applications, where its products are used in desktop and notebook computers; and client non-compute applications, where its products are used in a wide variety of end user devices such as digital video recorders (“DVRs”), personal data backup systems, portable external storage systems and digital media systems. The Company sells its disk drives primarily to major original equipment manufacturers (“OEMs”), distributors and retailers. In addition to manufacturing and selling disk drives, the Company provides storage services for small- to medium-sized businesses, including online backup, data protection and recovery solutions.

Basis of Presentation and Consolidation

The unaudited condensed consolidated financial statements include the accounts of the Company and all its wholly-owned subsidiaries, after elimination of intercompany transactions and balances. The preparation of financial statements in accordance with accounting principles generally accepted in the United States also requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. The methods, estimates and judgments the Company uses in applying its most critical accounting policies have a significant impact on the results the Company reports in its consolidated financial statements. The consolidated financial statements reflect, in the opinion of management, all material adjustments necessary to present fairly the consolidated financial position, results of operations, cash flows and shareholders’ equity for the periods presented. Such adjustments are of a normal and recurring nature.  The Company’s Consolidated Financial Statements for the fiscal year ended July 1, 2011 are included in its Annual Report on Form 10-K as filed with the United States Securities and Exchange Commission (SEC) on August 17, 2011. The Company believes that the disclosures included in the unaudited Condensed Consolidated Financial Statements, when read in conjunction with its Consolidated Financial Statements as of July 1, 2011 and the notes thereto, are adequate to make the information presented not misleading.

The results of operations for the three and six months ended December 30, 2011, are not necessarily indicative of the results of operations to be expected for any subsequent interim period in the Company’s fiscal year ending June 29, 2012. The Company operates and reports financial results on a fiscal year of 52 or 53 weeks ending on the Friday closest to June 30. The three and six months ended December 30, 2011 and December 31, 2010 consisted of 13 weeks and 26 weeks, respectively.  Fiscal year 2012 will be comprised of 52 weeks and will end on June 29, 2012.

Summary of Significant Accounting Policies

Since the Company’s fiscal year ended July 1, 2011, there have been no significant changes in the Company’s significant accounting policies other than the policy for testing impairment of goodwill discussed below. Please refer to Note 1 of “Financial Statements and Supplementary Data” contained in Part II, Item 8 of the Company’s Annual Report on Form 10-K for the fiscal year ended July 1, 2011, as filed with the SEC on August 17, 2011, for a discussion of the Company’s other significant accounting policies.

Impairment of Goodwill and Other Long-lived Assets — In September 2011, the FASB issued ASU No. 2011-08, Intangibles — Goodwill and Other (ASC Topic 350) — Testing Goodwill for Impairment. The ASU allows companies the option to perform a qualitative assessment in determining whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. Based on the qualitative assessment, if the fair value of a reporting unit is not less than its carrying amount then the Company is not required to perform the two-step goodwill impairment test. The Company has early adopted the ASU in the first quarter of fiscal year 2012. As required by the new ASU, the Company tests goodwill of its reporting units for impairment whenever events occur or circumstances change, such as an adverse change in business climate or a decline in the overall industry, that would more likely than not reduce the fair value of a reporting unit below its carrying amount, including goodwill.

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Newly Adopted and Recently Issued Accounting Pronouncements

In December 2011, the FASB issued ASU No. 2011-11, Balance Sheet (ASC Topic 210) — Disclosures about Offsetting Assets and Liabilities. The ASU requires enhanced disclosures on offsetting, including disclosing gross and net information about instruments and transactions eligible for offset and instruments and transactions subject to an agreement similar to a master netting agreement.  The ASU is effective for the Company’s first quarter of fiscal year 2014 and requires the enhanced disclosures for all comparative periods presented.  Other than requiring additional disclosures, the adoption of this new guidance will not have a material impact on the Company’s consolidated financial statements.

2.  Balance Sheet Information

Investments

The Company’s short-term investments are primarily comprised of readily marketable debt securities with remaining maturities of more than 90 days at the time of purchase.  With the exception of securities held for its non-qualified deferred compensation plan, which are classified as trading securities, the Company classifies its investment portfolio as available-for-sale.  The Company recognizes its available-for-sale investments at fair value with unrealized gains and losses included in Accumulated other comprehensive income (loss), which is a component of shareholders’ equity.  The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization and accretion are included in interest income. Realized gains and losses are included in Other, net. The cost of securities sold is based on the specific identification method.

As of December 30, 2011, the Company’s restricted cash and investments consisted of $75 million in cash equivalents and investments held in trust for payment of its non-qualified deferred compensation plan liabilities and $18 million in cash and investments held as collateral at banks for various performance obligations. As of July 1, 2011, the Company’s restricted cash and investments consisted of $84 million in cash equivalents and investments held in trust for payment of its non-qualified deferred compensation plan liabilities and $18 million in cash and investments held as collateral at banks for various performance obligations.

The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of December 30, 2011:

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The Company’s available-for-sale securities include investments in auction rate securities.  Beginning in fiscal year 2008, the Company’s auction rate securities failed to settle at auction and have continued to fail through December 30, 2011.  Since the Company continues to earn interest on its auction rate securities at the maximum contractual rate, there have been no payment defaults with respect to such securities, and they are all collateralized, the Company expects to recover the entire amortized cost basis of these auction rate securities.  The Company does not intend to sell these securities and has concluded it is not more likely than not that the Company will be required to sell the securities before the recovery of their amortized cost basis.  Given the uncertainty as to when the liquidity issues associated with these securities will improve, these securities are classified within Other assets, net in the Company’s Condensed Consolidated Balance Sheets.

As of December 30, 2011, with the exception of the Company’s auction rate securities, the Company had no available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months.  The Company determined no available-for-sale securities were other-than-temporarily impaired as of December 30, 2011.

The fair value and amortized cost of the Company’s investments in debt securities classified as available-for-sale at December 30, 2011 by remaining contractual maturity were as follows:

The following table summarizes, by major type, the fair value and amortized cost of the Company’s investments as of July 1, 2011:

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As of July 1, 2011, with the exception of the Company’s auction rate securities, the Company had no available-for-sale securities that had been in a continuous unrealized loss position for a period greater than 12 months.  The Company determined no available-for-sale securities were other-than-temporarily impaired as of July 1, 2011.

Inventories

Other Current Assets

Other current assets include non-trade receivables from certain manufacturing vendors resulting from the sale of components to these vendors who manufacture and sell completed sub-assemblies back to the Company. The Company does not reflect the sale of these components in revenue and does not recognize any profits on these sales. The costs of the completed sub-assemblies are included in inventory upon purchase from the vendors.

Property, Equipment and Leasehold Improvements, net

3.  Debt

Short-Term Borrowings

On January 18, 2011, the Company and its subsidiary, Seagate HDD Cayman (“the Borrower”), entered into a credit agreement which provides for a $350 million senior secured revolving credit facility. Seagate Technology plc and certain of its material subsidiaries fully and unconditionally guarantee, on a senior secured basis, the revolving credit facility. The revolving credit facility matures in January 2015. The $350 million revolving credit facility is available for cash borrowings and for the issuance of letters of credit up to a sub-limit of $75 million. As of December 30, 2011, no borrowings have been drawn under the revolving credit facility, and $4 million had been utilized for letters of credit.

Long-Term Debt

$600 Million Aggregate Principal Amount of 6.375% Senior Notes due October 2011 (the “2011 Notes”).  The 2011 Notes matured on October 1, 2011 and the Company repaid the entire outstanding principal amount of $559 million, plus accrued and unpaid interest on October 3, 2011.

$430 Million Aggregate Principal Amount of 10.00% Senior Secured Second-Priority Notes due May 2014 (the “2014 Notes”). The interest on the 2014 Notes is payable semi-annually on May 1 and November 1 of each year. The issuer under the 2014 Notes is Seagate Technology International, and the obligations under the 2014 Notes are unconditionally guaranteed by the Company and certain of its significant subsidiaries. In addition, the obligations under the 2014 Notes are secured by a second-priority lien on substantially all of the Company’s tangible and intangible assets. The indenture governing the 2014 Notes contains covenants that limit the Company’s ability, and

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the ability of certain of its subsidiaries, (subject to certain exceptions) to: incur additional debt or issue certain preferred shares, create liens, enter into mergers, pay dividends, redeem or repurchase debt or shares, and enter into certain transactions with the Company’s shareholders or affiliates. In the first six months of fiscal year 2012, the Company repurchased $30 million aggregate principal amount of its 2014 Notes for cash at a premium to their principal amount, plus accrued and unpaid interest. The Company recorded a loss on the redemption of approximately $5 million, which is included in Other, net in the Company’s Condensed Consolidated Statements of Operations for the six months ended December 30, 2011. The 2014 Notes are included in Long-term debt, less current portion in the Condensed Consolidated Balance Sheet at December 30, 2011.

$600 Million Aggregate Principal Amount of 6.8% Senior Notes due October 2016 (the “2016 Notes”).  The interest on the 2016 Notes is payable semi-annually on April 1 and October 1 of each year. The issuer under the 2016 Notes is Seagate Technology HDD Cayman, and the obligations under the 2016 Notes are unconditionally guaranteed by certain of the Company’s significant subsidiaries. The 2016 Notes are included in Long-term debt, less current portion in the Condensed Consolidated Balance Sheet at December 30, 2011.

$750 Million Aggregate Principal Amount of 7.75% Senior Notes due December 2018 (the “2018 Notes”). The interest on the 2018 Notes is payable semi-annually on June 15 and December 15 of each year. The issuer under the 2018 Notes is Seagate Technology HDD Cayman and the obligations under the 2018 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by certain of the Company’s significant subsidiaries. The 2018 Notes are included in Long-term debt, less current portion in the Condensed Consolidated Balance Sheet at December 30, 2011.

$600 Million Aggregate Principal Amount of 6.875% Senior Notes due May 2020 (the “2020 Notes”).  The interest on the 2020 Notes is payable semi-annually on May 1 and November 1 of each year. The issuer under the 2020 Notes is Seagate Technology HDD Cayman, and the obligations under the 2020 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by the Company. The 2020 Notes are included in Long-term debt, less current portion in the Condensed Consolidated Balance Sheet at December 30, 2011.

$600 Million Aggregate Principal Amount of 7.00% Senior Notes due November 2021 (the “2021 Notes”). The interest on the 2021 Notes is payable semi-annually on January 1 and July 1 of each year. The issuer under the 2018 Notes is Seagate Technology HDD Cayman and the obligations under the 2021 Notes are fully and unconditionally guaranteed, on a senior unsecured basis, by certain of the Company’s significant subsidiaries. The 2021 Notes are included in Long-term debt, less current portion in the Condensed Consolidated Balance Sheet at December 30, 2011.

At December 30, 2011, future principal payments on long-term debt were as follows (in millions):

4. Income Taxes

The income tax benefit of $5 million recorded for the three months ended December 30, 2011 included $7 million of tax benefit from the reversal of a portion of the U.S. valuation allowance recorded in prior periods.  The income tax provision of $6 million recorded for the six months ended December 30, 2011 included approximately $10 million of discrete tax benefits from the reversal of a portion of the U.S. valuation allowance recorded in prior periods and the release of tax reserves associated with the expiration of certain statutes of limitation.

The Company’s income tax benefit and provision recorded for the three and six months ended December 30, 2011 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes, primarily due to the net effect of (i) tax benefits related to non-U.S. earnings

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generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland, (ii) a decrease in valuation allowance for certain U.S. deferred tax assets,  (iii) the release of tax reserves as a result of the expiration of statutes of limitation, and (iv) tax expense related to intercompany transactions.

The Company recorded an income tax provision of $25 million and $29 million for the three and six months ended December 31, 2010, respectively. The income tax provision for the three and six months ended December 31, 2010 included approximately $1 million and $11 million of discrete tax benefits, respectively, primarily from the release of tax reserves associated with the expiration of certain statutes of limitations.  In addition, $11 million of discrete income tax benefits from the loss recognized on the redemption of debt was offset by a corresponding increase in the valuation allowance for U.S. deferred tax assets.

The Company’s provision for income taxes recorded for the three and six months ended December 31, 2010 differed from the provision for income taxes that would be derived by applying the Irish statutory rate of 25% to income before income taxes primarily due to the net effect of (i) tax benefits related to non-U.S. earnings generated in jurisdictions that are subject to tax holidays or tax incentive programs and are considered indefinitely reinvested outside of Ireland, (ii) an increase in valuation allowance for U.S. deferred tax assets, (iii) tax expense related to intercompany transactions, and (iv) the release of tax reserves as a result of the expiration of statutes of limitation.

On December 17, 2010, the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 (the 2010 Tax Relief Act) was enacted. The 2010 Tax Relief Act includes business incentives to invest in machinery and equipment, and retroactively reinstated the R&D tax credit through December 31, 2011 from December 31, 2009. These business incentives had no immediate impact on the Company’s income tax provision due to the existing valuation allowances for certain U.S. deferred tax assets.

5. Acquisitions

On December 19, 2011, the Company completed the acquisition of Samsung Electronics Co., Ltd’s (“Samsung”) hard disk drive (“HDD”) business pursuant to an Asset Purchase Agreement (“APA”) by which the Company acquired certain assets and liabilities of Samsung relating to the research and development, manufacture and sale of hard-disk drives. The transaction and related agreements are expected to improve the Company’s position as a supplier of 2.5-inch products; position the Company to better address rapidly evolving opportunities in markets including, but not limited to, mobile computing, cloud computing and solid state storage; expand the Company’s customer access in China and Southeast Asia; and accelerate time to market for new products.

The acquisition-date fair value of the consideration transferred totaled $1,140 million, which consisted of $571 million of cash, $10 million of which was paid as a deposit upon signing the APA in the fourth quarter of fiscal year 2011, and 45.2 million ordinary shares with a fair value of $569 million.  The fair value of the ordinary shares issued was determined based on the closing market price of the Company’s ordinary shares on the acquisition date, less a 16.5% discount for lack of marketability as the shares issued are subject to a restriction that limits their trade or transfer for approximately a one year period.

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The following table summarizes the preliminary estimated fair values of the assets acquired and liabilities assumed at the acquisition date (in millions):

The amount noted above for warranty is provisional, being an estimate calculated on the basis of projected product failure rates and timing of product returns during the warranty period. Seagate assumed product warranty obligations from Samsung on products sold prior to the acquisition. These products are warranted for up to three years from the original shipment date. The estimate of the warranty liability is subject to a significant degree of subjectivity since the Company does not have experience with Samsung products. If actual return rates differ materially from the Company’s estimate, or if there is an epidemic failure of drives for which Seagate assumed warranty obligations, the fair value of the warranty liability may need to be reestimated during the measurement period, which may be up to one year following the acquisition date.

The Company received a patent portfolio that may have value apart from being an enabling technology that is included within the fair value of Intangible assets – Existing technology.  However, the Company has not received all information regarding these patents that is necessary for the completion of a review to determine the extent of encumbrances and the scope of their application.  Therefore, provisionally, no separately identifiable value has been recognized for the patent portfolio.

As part of the acquisition, the Company assumed certain vendor-related and other obligations and contingent liabilities.  Due to the nature of these obligations and contingent liabilities, the Company has not received sufficient information needed to determine the fair value of these obligations.

The following table shows the fair value of the separately identifiable intangible assets at the time of acquisition and the period over which each intangible asset will be amortized:

The $437 million of goodwill recognized is attributable primarily to the benefits the Company expects to derive from enhanced scale and efficiency to better serve its markets and expanded customer presence in China and Southeast Asia.  Except for approximately $4 million of goodwill relating to assembled workforce in Korea, none of the goodwill is expected to be deductible for income tax purposes.  As of December 30, 2011, there were no changes in the recognized amounts of goodwill resulting from the acquisition of Samsung’s HDD business.

The Company incurred $17 million and $29 million of expenses related to the acquisition of Samsung for the three and six months ended December 30, 2011, which are included within marketing and administrative expense on the Condensed Consolidated Statement of Operations.

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The amounts of revenue and earnings of the acquired assets of Samsung’s HDD business included in the Company’s Condensed Consolidated Statement of Operations from the acquisition date during the three and six months ended December 30, 2011 were as follows:

The unaudited pro forma financial results presented below for the three and six months ended December 30, 2011 and December 31, 2010 include the effects of pro forma adjustments as if the acquisition date occurred as of the beginning of the prior fiscal year on July 3, 2010. The pro forma results combine the historical results of the Company for the three and six months periods ended December 30, 2011 and December 31, 2010, respectively, and the historical results of the acquired assets and liabilities of Samsung’s HDD business, and include the effects of certain fair value adjustments and the elimination of certain activities excluded from the transaction. The pro forma financial information is presented for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of the earliest period presented, nor does it intend to be a projection of future results.

The pro forma results for the three and six months ended December 30, 2011 include adjustments of $33 million and $65 million, respectively, to reflect the additional depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied on July 3, 2010. The pro forma results for the three and six months ended December 31, 2010, include adjustments of $29 million and $56 million, respectively, to reflect the additional depreciation and amortization that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been applied on July 3, 2010.

6.  Goodwill and Other Intangible Assets

The changes in the carrying amount of goodwill for the six months ended December 30, 2011 are as follows:

The carrying value of other intangible assets subject to amortization as of December 30, 2011 is set forth in the following table:

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The carrying value of other intangible assets subject to amortization as of July 1, 2011 is set forth in the following table:

The carrying value of In-process research and development was $44 million and $0 as of December 30, 2011and July 1, 2011, respectively.

For the three and six months ended December 30, 2011, amortization expense of other intangible assets was $5 million and $5 million, respectively. For the three and six months ended December 31, 2010, amortization expense of other intangible assets was $2 million and $5 million, respectively. As of December 30, 2011, expected amortization expense for other intangible assets for each of the next five years and thereafter is as follows:

7.  Derivative Financial Instruments

The Company is exposed to foreign currency exchange rate, interest rate, and to a lesser extent, equity price risks relating to its ongoing business operations. The Company enters into foreign currency forward exchange contracts to manage the foreign currency exchange rate risk on forecasted expenses denominated in foreign currencies and to mitigate the remeasurement risk of certain foreign currency denominated liabilities.  The Company’s accounting policies for these instruments are based on whether the instruments are classified as designated or non-designated hedging instruments. The Company records all derivatives in the Condensed Consolidated Balance Sheets at fair value. The changes in the fair values of the effective portions of designated cash flow hedges are recorded in Accumulated other comprehensive loss until the hedged item is recognized in earnings. Derivatives that are not designated as hedging instruments and the ineffective portions of cash flow hedges are adjusted to fair value through earnings.  As of December 30, 2011 and July 1, 2011, the Company had a net unrealized loss and a net unrealized gain on cash flow hedges of approximately $5 million and $2 million, respectively.

The Company dedesignates its cash flow hedges when the forecasted hedged transactions are realized or it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in Accumulated other comprehensive loss are reclassified immediately into earnings and any subsequent changes in the fair value of such derivative instruments are immediately reflected in earnings. The Company did not recognize any material net gains or losses related to the loss of hedge designation on discontinued cash flow hedges during the three and six months ended December 30, 2011 and December 31, 2010. As of December 30, 2011, the Company’s existing foreign currency forward exchange contracts mature within 12 months. The deferred amount currently recorded in Accumulated other comprehensive loss and expected to be recognized into earnings over the next 12 months is a net loss of $5 million.

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The following tables show the total notional value of the Company’s outstanding foreign currency forward exchange contracts as of December 30, 2011 and July 1, 2011:

The following table shows the Company’s derivative instruments measured at fair value as reflected in the Condensed Consolidated Balance Sheet as of December 30, 2011:

Fair Values of Derivative Instruments as of December 30, 2011