CY13 11-K
Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
 FORM 11-K
 
  
ý
Annual Report pursuant to Section 15(d) of the Securities Exchange Act of 1934
For the fiscal year ended December 31, 2013
OR
 
¨
Transition Report pursuant to Section 15(d) of the Securities Exchange Act of 1934
For the transition period from                      to                     
Commission File Number 1-8703
 
  
A.
Full title of the plan and the address of the plan, if different from that of the issuer named below:
WESTERN DIGITAL CORPORATION 401(k) PLAN
 
B.
Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:
WESTERN DIGITAL CORPORATION
3355 Michelson Drive, Suite 100
Irvine, California 92612




Table of Contents

INTRODUCTION
Western Digital Corporation ("the Company") has established the Western Digital Corporation 401(k) Plan (the “Plan”). The Plan is intended to qualify under Section 401(a) of the Internal Revenue Code of 1986, as amended (the “Code”) as a profit sharing plan and Section 401(k) of the Code as a cash or deferred arrangement.
REQUIRED INFORMATION
Signature
Financial Statements:
These statements are listed in the Index to Financial Statements and Supplemental Schedules.
Exhibits:
Consent of Independent Registered Public Accounting Firm — BDO USA, LLP
 

2

Table of Contents

SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the Plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.
 
 
 
 
 
WESTERN DIGITAL CORPORATION 401(k) PLAN
 
 
 
 
Date: May 30, 2014
 
 
 
By:
 
/s/ TIMOTHY M. LEYDEN
 
 
 
 
 
 
Timothy M. Leyden
 
 
 
 
 
 
Retirement, Severance, and Administrative
 
 
 
 
 
 
Committee Member



3

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
INDEX TO FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULES
 
 
 
 
Page
Report of Independent Registered Public Accounting Firm — BDO USA, LLP
Statements of Net Assets Available for Plan Benefits as of December 31, 2013 and 2012
Statement of Changes in Net Assets Available for Plan Benefits for the year ended December 31, 2013
Notes to Financial Statements
Supplemental Schedules
 
Schedule H, Line 4i — Supplemental Schedule of Assets (Held at End of Year) at December 31, 2013
Schedule H, Line 4a — Supplemental Schedule of of Delinquent Participant Contributions for the year ended December 31, 2013
 
Note:
Additional supplemental schedules have been omitted because they are not applicable or are not required by 29 CFR 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974, as amended.

4

Table of Contents

Report of Independent Registered Public Accounting Firm
Retirement, Severance, and Administrative Committee
Western Digital Corporation 401(k) Plan
Irvine, California
We have audited the accompanying statements of net assets available for plan benefits of the Western Digital Corporation 401(k) Plan (the “Plan”) as of December 31, 2013 and 2012, and the related statement of changes in net assets available for plan benefits for the year ended December 31, 2013. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for plan benefits of the Plan as of December 31, 2013 and 2012, and the changes in net assets available for plan benefits for the year ended December 31, 2013, in conformity with accounting principles generally accepted in the United States of America.
Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole. The accompanying supplemental schedules of delinquent participant contributions for the year ended December 31, 2013 and assets (held at end of year) as of December 31, 2013 are presented for the purpose of additional analysis and are not a required part of the basic financial statements but are supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. These supplemental schedules are the responsibility of the Plan’s management. The supplemental schedules have been subjected to the auditing procedures applied in the audits of the basic financial statements and, in our opinion, are fairly stated in all material respects in relation to the basic financial statements taken as a whole.
/s/ BDO USA, LLP
Costa Mesa, California
May 30, 2014


5

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
Statements of Net Assets Available for Plan Benefits
(in thousands)
 
 
 
December 31,
 
 
2013
 
2012
Assets
 
 
 
 
Investments, at fair value
 
$
817,370

 
$
596,644

Non-interest bearing cash
 
17

 
66

Receivables:
 
 
 
 
Employer contributions receivable
 
1,744

 
651

Notes receivable from participants
 
11,324

 
10,586

Total receivables
 
13,068

 
11,237

Total assets available for Plan benefits
 
830,455

 
607,947

Adjustment from fair value to contract value for fully benefit-responsive investment contracts (common collective trust funds)
 
(1,616
)
 
(4,335
)
Net assets available for Plan benefits
 
$
828,839

 
$
603,612

See accompanying notes to financial statements.


6

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
Statement of Changes in Net Assets Available for Plan Benefits
(in thousands)
  
 
 
 
Year Ended
December 31, 2013
Additions:
 
Additions to net assets available for Plan benefits attributed to:
 
Contributions:
 
Participant
$
72,144

Participant rollover
23,647

Employer, net of forfeitures
19,166

Total contributions
114,957

Net investment income:
 
Net appreciation in fair value of investments
133,726

Dividend income
21,641

Total net investment income
155,367

Interest income on notes receivable from participants
448

Other income
503

Total additions
271,275

Deductions:
 
Deductions from net assets available for Plan benefits attributed to:
 
Benefits paid to participants
(45,806
)
Other expenses
(242
)
Total deductions
(46,048
)
Net increase in net assets available for Plan benefits
225,227

Net assets available for Plan benefits:
 
Beginning of year
603,612

End of year
$
828,839

See accompanying notes to financial statements.


7

Table of Contents


WESTERN DIGITAL CORPORATION 401(k) PLAN
Notes to Financial Statements
1. Description of the Plan
General
The following description of the Western Digital Corporation 401(k) Plan (the “Plan”) provides only general information. Participants should refer to the Plan document for a more complete description of the Plan’s provisions. The Plan is a defined contribution plan as defined by the Employee Retirement Income Security Act of 1974, as amended (“ERISA”).

Western Digital Corporation ("the Company") acquired Virident Systems, Inc. ("Virident") on October 17, 2013, sTec, Inc. (“sTec”) on September 12, 2013, and VeloBit, Inc. ("VeloBit") on July 9, 2013. As of the closing dates of the acquisitions, employees of Virident, sTec and VeloBit were allowed to enroll and participate in the Plan. These employees were also provided the option to roll over their account balances and existing loans from previous plans as of the acquisition closing dates.
Administration of the Plan
The Retirement, Severance, and Administrative Committee (the “Committee”), appointed by the Board of Directors and consisting of at least three members, has the authority to control and manage the operation and administration of the Plan. The Plan assets are held under a trust for which T. Rowe Price Trust Company acts as trustee and are administered under a trust agreement, which requires that the trustee hold, administer, and distribute the funds of the Plan in accordance with the Plan document and the instructions of the Committee or its designees. In 2013, the Company, in its capacity as the sponsoring employer of the Plan, appointed Evercore Trust Company, N.A. (“Evercore”) to serve as the named fiduciary and investment manager for the assets of the Plan that consist of shares of common stock of the Company (the “Stock Fund”).
Contributions
Employees paid through the Company's United States payroll are eligible to participate in the Plan and to receive employer matching contributions immediately upon hire unless the individual is covered by a collective bargaining agreement, provides services as a consultant, intern, independent contractor, leased or temporary employee, or otherwise is not treated as a common-law employee. Unless an employee has declined to participate in the Plan, all newly eligible participants are automatically enrolled in the Plan and contributions equal to 5% of their eligible compensation are automatically withheld and contributed to the Plan as pre-tax elective contributions. Participants may elect to adjust, cease or resume their contributions at any time. The accounts of participants who have never made an investment election are allocated to investments under a qualified default investment alternative, which is intended to comply with ERISA regulations. At any time, participants may elect to alter the investments in their accounts, which were originally allocated to a qualified default investment alternative.
During the year ended December 31, 2013, eligible employees were able to contribute up to 30% of their eligible compensation on a pre-tax basis, provided that contributions did not exceed Internal Revenue Service (“IRS”) limitations, and up to 10% of their eligible compensation on an after-tax basis. The Company allows employees who have attained age fifty before the close of a Plan year to make a catch up contribution subject to IRS limitations. The amount of the catch up contribution is not eligible for matching contributions under the Plan. The Plan also allows employees to contribute balances from other qualified plans (“rollover contributions”). The Company makes a basic matching contribution on behalf of each participating eligible employee equal to fifty percent (50%) of the eligible participant’s pre-tax contributions for the contribution cycle, not to exceed 5% of the eligible participant’s compensation. However, each eligible participant shall receive a minimum annual basic matching contribution, as defined, equal to fifty percent (50%) of the first $4,000 of pre-tax contributions for any calendar year. In 2013, the Plan was amended to provide for an alternate year-end true-up matching contribution such that participants who save at least 5% of their eligible compensation for the year receive a minimum annual matching contribution equal to 2.5% of eligible compensation (up to IRS limitations). The Company may also make additional contributions at its discretion. During the year ended December 31, 2013, the Company did not make any discretionary contributions to the Plan. The Company may suspend matching contributions at any time in its discretion. Contributions, including the Company’s matching contribution to the Plan, are recorded as soon as administratively possible after the Company makes payroll deductions from Plan participants.

Investments
The Plan had 28 investment options available as of December 31, 2013 and 2012. As of December 31, 2013 and 2012, all of the Plan’s assets were invested in mutual funds, common collective trust funds, Western Digital Corporation common stock or publicly traded equity investments.

8

Table of Contents

Subject to certain limits, participants may transfer all or a portion of the balance in their accounts or future contributions between investment funds on a daily basis. Participants may direct no more than 20% of their contributions into the Stock Fund. In addition, participants are not permitted to exchange or reallocate assets that would result in an investment of greater than 20% of their vested account balance in the Stock Fund. Effective July 1, 2013, the Plan was amended to provide for Evercore’s duties with respect to the Stock Fund, including evaluating the prudence of maintaining the Stock Fund as an investment option under the Plan. Participants may also transfer up to a maximum of 25% of their overall Plan balance, less any outstanding loan amounts, to the Tradelink Investment account, which is a self-directed brokerage account that offers discount brokerage services for securities not offered under the Plan. The self-directed brokerage account allows Plan participants to invest in various publicly-traded securities and exchange-listed closed-end funds, as well as certain open-end mutual funds.
Notes Receivable from Participants
Notes receivable from participants consist of participant loans that are secured by the balance in the participant’s account. Participants may borrow a minimum of $1,000 up to an amount equal to the lesser of: $50,000 reduced by the participant’s highest outstanding loan balance during the preceding 12 months or 50% of a participant’s vested account balance. The loans bear interest at a rate fixed at the time of the loan equal to 1% above the then-current prime rate established by T. Rowe Price Trust Company. The loans are generally payable in installments over periods ranging from one to five years, unless the loan is used for the purchase of a primary residence, in which case the repayment period may be up to ten years. Principal and interest payments are paid ratably through payroll deductions and are allocated to the participants’ accounts in the same manner as their current contributions. Effective January 1, 2010, the maximum number of active loans a Plan participant may have at a time was reduced from two to one and there is a 30-day waiting period between payoff and initiation of loans. The annual interest rate charged on employee loans outstanding during the year ended December 31, 2013 ranged from 4.25% to 9.25%. A loan that is considered in default is reported as a deemed distribution, which is a taxable event for the participant.
The Plan currently has participant loans that have an initial term of up to 15 years. These participant loans became part of the Plan in connection with rollover balances from the acquisition of HGST in March 2012.
Participant Accounts
A separate account is maintained for each participant in each designated fund. Each account is adjusted for employee and employer contributions, net investment income or loss, and expenses, on a daily basis. Net investment income or loss is allocated to the accounts in the same proportion as the participant’s beginning account balance invested in the fund (as defined in the Plan) bears to the total of all participants’ beginning account balances invested in the fund. Fees are charged for the purchase and subsequent sale of certain Plan investments within a specified time frame (“redemption fees”) and for the origination of a loan, and are allocated to participants’ accounts. The benefit that each participant is entitled to is equal to the vested interest in their account balance.
Payment of Benefits and Forfeitures
Benefits are generally payable in lump-sums or installment payments to participants upon disability, death, hardship or termination of employment. These benefits may be taken from rollover accounts, after-tax contributions or for certain financial hardships. Effective January 1, 2013, the Plan was amended to allow participants to roll over retirement savings from individual retirement accounts ("IRAs") and to allow participants to withdraw funds from rollover sources at any time, whereas previously rollover funds could only be withdrawn at the time of termination from the Plan. Participants receiving these benefits will be required to pay all applicable taxes on the withdrawals and may be subject to penalty taxes for early withdrawals taken prior to age fifty-nine and one-half years. The Plan was also amended to allow participants who are fifty-nine and one-half years or older but still active employees of the Company to withdraw their savings at any time without penalty. Upon termination of service, participants may elect to roll their vested interest over to another qualified retirement plan or an IRA, or they may elect to receive a payment in cash and/or shares of the Company’s common stock. Participants who terminate employment with an aggregate vested account balance of $5,000 or less and do not make one of the selections described above will receive an automatic distribution of their account balance to an IRA. The nonvested portion of terminated participants’ accounts is forfeited subject to a five-year reinstatement period. Plan forfeitures not needed to restore forfeited matching contributions are used to pay Plan expenses or used by the Company to reduce employer contributions. During the year ended December 31, 2013, Plan forfeitures totaling $152,000 were used to reduce employer contributions and pay administrative fees. Unallocated forfeitures at December 31, 2013 and 2012 were $50,000 and $107,000, respectively.

Certain restrictions apply to withdrawals of amounts from the Plan while a participant continues to be employed by the Company.

9

Table of Contents

Vesting
Participants are at all times one hundred percent vested in the value of their voluntary contributions, their rollover contributions, and the Company’s profit sharing contributions, and all earnings thereon. A participant vests 20% in employer contributions other than profit sharing contributions after one year of service and 20% annually thereafter (as defined in the Plan), and are 100% vested upon retirement (at normal retirement age), permanent disability or death.
Administrative Expenses
The compensation or fees of accountants, counsel and other specialists and any other costs of administering the Plan or the trust are paid by the Company or charged to the trust at the discretion of the Company. Administrative expenses that are not paid by the Company are paid by the Plan's administrative budget, which is derived from payments received by the Plan's trustee for administrative services related to various mutual funds and investment trusts offered in the Plan that exceed the negotiated fee between the Company and the trustee. Effective January 1, 2013, the Plan was amended to allocate any excess of the Plan's administrative budget to participants. As a result, other income of $503,000 for the year ended December 31, 2013 primarily relates to the excess allocation of the Plan's administrative budget to participants of the Plan. Net administrative expenses for the year ended December 31, 2013, were $242,000 and are in included in other expenses in the statement of changes in net assets available for Plan benefits.
Profit Sharing Feature
All eligible employees of the Company who are employed on the last day of the Company’s fiscal year are eligible to participate in the Plan’s profit sharing feature. The amount of profit sharing paid to participants, which is granted at the discretion of the Company, is dependent upon their eligible compensation earned during the fiscal year. If approved, each eligible participant’s allocation of the Company’s profit sharing contribution is deposited into an individual profit sharing account established under the Plan. During the year ended December 31, 2013, the Company made no profit sharing contributions to the Plan.
2. Summary of Significant Accounting Policies
Basis of Presentation
The accompanying financial statements of the Plan have been prepared on the accrual basis of accounting in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and present the net assets available for Plan benefits as of December 31, 2013 and 2012 and changes in net assets available for Plan benefits for the year ended December 31, 2013.
Valuation of Investments and Income Recognition
The Plan’s investments are stated at fair value, which is the price that would be received to sell an asset in an orderly transaction between market participants at the measurement date. See Note 3 for disclosure of the Plan’s fair value measurements.
Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on an accrual basis. Dividend income is recorded on the ex-dividend date. Net appreciation in fair value of investments includes the Plan’s gains and losses on investments bought and sold as well as held during the Plan year.
The T. Rowe Price Stable Value Fund, which is a common collective trust fund, invests in a variety of investment contracts such as traditional guaranteed investment contracts (“GICs”) issued by insurance companies and other financial institutions and other investment products with similar characteristics. Investment contracts held by a defined contribution plan are required to be reported at fair value. However, contract value is the relevant measurement attribute for that portion of the net assets available for Plan benefits of a defined contribution plan attributable to fully benefit-responsive investment contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. The statements of net assets available for Plan benefits presents the fair value of the fully benefit-responsive investment contracts as well as the adjustment of the fully benefit-responsive investment contracts from fair value to contract value. The statement of changes in net assets available for Plan benefits is prepared on a contract value basis.

Notes Receivable from Participants
Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Delinquent notes receivable from participants are reclassified as distributions based upon the terms of the Plan document.

10

Table of Contents

Payment of Benefits
Benefits are recorded when paid. At December 31, 2013 and 2012, there were no amounts allocated to accounts of persons who had elected to withdraw from the Plan, but had not been paid at that date.
Use of Estimates
The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could materially differ from those estimates.
Recent Accounting Pronouncements
    
In October 2012, the Financial Accounting Standards Board issued Accounting Standards Update 2012-04, "Technical Corrections and Improvements" ("ASU 2012-04"). ASU 2012-04 makes certain technical corrections, conforms terminology and clarifies guidance in various Topics of the Accounting Standards Codification ("ASC"). ASU 2012-04 includes an amendment that clarifies that plan investments subject to ASC Topic 962, "Plan Accounting – Defined Contribution Pension Plans" ("ASC 962"), are measured at fair value less costs to sell, if those costs are significant. The Plan’s adoption of ASU 2012-04 did not have a material effect on the Plan’s net assets available for benefits or changes in net assets available for benefits.
3. Fair Value Measurements
Financial assets and liabilities that are re-measured and reported at fair value at each reporting period are classified and disclosed in one of the following three levels:
Level 1. Quoted prices in active markets for identical assets.
Level 2. Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3. Inputs that are unobservable for the asset and that are significant to the fair value of the assets.

11

Table of Contents

The following presents information about the Plan’s financial investments that are measured at fair value on a recurring basis as of December 31, 2013, and indicates the fair value hierarchy of the valuation techniques utilized to determine such value (in thousands):
 
 
Fair Value Measurements at Reporting
Date Using
 
 
 
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
Investments
 
 
 
 
 
 
 
 
Mutual funds:
 
 
 
 
 
 
 
 
Fixed income (1)
 
$
47,162

 
$

 
$

 
$
47,162

Growth (2)
 
151,199

 

 

 
151,199

Balance (3)
 
246,930

 

 

 
246,930

Value (4)
 
129,275

 

 

 
129,275

Other (7)
 
500

 

 

 
500

Total mutual funds
 
575,066

 

 

 
575,066

Common collective trust funds:
 
 
 
 
 
 
 
 
Index fund (5)
 

 
60,860

 

 
60,860

Other (6)
 

 
115,680

 

 
115,680

Total common collective trust funds
 

 
176,540

 

 
176,540

Western Digital Corporation common stock
 
64,342

 

 

 
64,342

Tradelink investment accounts:
 
 
 
 
 
 
 
 
Common stocks
 
995

 

 

 
995

Mutual funds:
 
 
 
 
 
 
 
 
Other (7)
 
397

 

 

 
397

Growth (2)
 
20

 

 

 
20

Index fund (5)
 
10

 

 

 
10

Total Tradelink mutual funds
 
427

 

 

 
427

Total Tradelink investment accounts
 
1,422

 

 

 
1,422

Total investments at fair value
 
$
640,830

 
$
176,540

 
$

 
$
817,370



12

Table of Contents

The following presents information about the Plan’s financial investments that are measured at fair value on a recurring basis as of December 31, 2012, and indicates the fair value hierarchy of the valuation techniques utilized to determine such value (in thousands):
 
 
Fair Value Measurements at Reporting
Date Using
 
 
 
 
Quoted Prices
in Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Total
Investments
 
 
 
 
 
 
 
 
Mutual funds:
 
 
 
 
 
 
 
 
Fixed income (1)
 
$
55,619

 
$

 
$

 
$
55,619

Growth (2)
 
99,881

 

 

 
99,881

Balance (3)
 
160,974

 

 

 
160,974

Value (4)
 
89,898

 

 

 
89,898

Other (7)
 
17

 

 

 
17

Total mutual funds
 
406,389

 

 

 
406,389

Common collective trust funds:
 
 
 
 
 
 
 
 
Index fund (5)
 

 
44,002

 

 
44,002

Other (6)
 

 
105,175

 

 
105,175

Total common collective trust funds
 

 
149,177

 

 
149,177

Western Digital Corporation common stock
 
40,161

 

 

 
40,161

Tradelink investment accounts:
 
 
 
 
 
 
 
 
Common stocks
 
614

 

 

 
614

Mutual funds:
 
 
 
 
 
 
 
 
Other (7)
 
266

 

 

 
266

Growth (2)
 
32

 

 

 
32

Index fund (5)
 
5

 

 

 
5

Total Tradelink mutual funds
 
303

 

 

 
303

Total Tradelink investment accounts
 
917

 
 
 
 
 
917

Total investments at fair value
 
$
447,467

 
$
149,177

 
$

 
$
596,644


(1)
These diversified funds focus on total return and employ bottom-up strategies such as analyzing and selecting certain securities as well as top-down strategies such as exposure to interest rates.
(2)
These diversified funds employ a fundamentally-based investment approach focused on investments in companies whose earnings are expected to grow at a faster rate than an average company.
(3)
These diversified funds invest in underlying mutual funds that include stocks, bonds and short-term investments.
(4)
These diversified funds focus on fundamentally-based investment approach and bottom-up stock selection of undervalued companies.
(5)
These funds seek to track the performance of the S&P 500 index.
(6)
These funds focus on maintaining investment principal while providing a yield by investing in a diversified portfolio of structured investment contracts and/or short-term securities.
(7)
These funds invest in short-term debt and equity securities with maturities of 13 months or less.
Mutual Funds. The Plan’s mutual funds are valued at the net asset value (“NAV”) of shares held by the Plan at year end.
Common Collective Trust Funds. The beneficial interest of each participant is represented in units, which are issued and redeemed daily at the fund’s closing NAV, which is calculated by T. Rowe Price Trust Company.
The Index fund category calculates fair value for equity securities traded on national exchanges or on the over the counter market based on the last quoted price on the valuation date. Fair value for debt securities is based on amortized cost, dealer prices, or by an independent pricing service that utilizes observable market data.
The Other category calculates fair value for GICs and other investment products with similar characteristics based on the market value or by discounting the scheduled future payments utilizing observable market data at the valuation date. The

13

Table of Contents

fair value of separate account contracts is based on the fair value of securities held by the issuer that are designated for payment of benefit-responsive withdrawals and by issuer quotes. The fair value of wrap contracts is based on the discounted present value of the difference between the current wrap contract cost and its replacement cost. Fair value for debt securities is based on amortized cost, dealer prices, or by an independent pricing service that utilizes observable market data. Fair value for futures contracts are valued at closing settlement prices and investments in other trusts are valued at the other trust’s closing NAV on the valuation date.
Western Digital Corporation Common Stock. The Plan’s Western Digital Corporation common stock is valued at the closing price reported by the national securities exchange on which the investment is traded.
Tradelink Investment Accounts. The Plan’s Tradelink investments are valued at the closing price reported by the national securities exchanges on which the investments are traded.
The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although the Plan believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
At December 31, 2013, the Plan had no unfunded commitments related to Common Collective Trust Funds. The redemption of Common Collective Trust Funds is subject to the preference of individual Plan participants and contains no restrictions on the timing of redemption; however, participant redemptions may be subject to certain redemption fees.
The Plan did not have any transfers between levels during the years ended December 31, 2013 and 2012.
4. Investments
The following presents the Plan’s investments as of December 31, 2013 and 2012, with individual investments that represent 5% or more of the Plan’s net assets available for Plan benefits, separately identified (in thousands): 
 
 
December 31,
 
 
2013
 
2012
Common Stock:
 
 
 
 
Western Digital Corporation
 
$
64,342

 
$
40,161

Mutual Funds:
 
 
 
 
Equity Income Fund
 
43,052

 
31,811

PIMCO Total Return Fund II
 

 
39,860

Mid-Cap Growth Fund
 
67,659

 
44,927

Retirement 2020 Fund
 
44,278

 

Retirement 2025 Fund
 
46,718

 

Retirement 2030
 
42,981

 

Small-Cap Value Fund
 
42,747

 
30,932

Common Collective Trust Funds:
 
 
 
 
Equity Index Trust
 
60,860

 
44,002

Stable Value Fund
 
115,680

 
105,175

All Investments less than 5% of Plan Net Assets
 
289,053

 
259,776

Total Investments
 
$
817,370

 
$
596,644


The Plan’s investments, including gains and losses on investments bought and sold as well as held during the year, appreciated in value as follows (in thousands): 
 
 
 
Year ended
December 31, 2013
Common Stock
$
34,799

Mutual Funds
82,352

Common Collective Trust Funds
16,575

 
$
133,726


14

Table of Contents

5. Party-In-Interest Transactions
Certain investments in mutual funds, investments within the Tradelink investment account and assets held in common collective trust funds within the Plan are managed by T. Rowe Price Trust Company, the Plan’s trustee. Purchases and sales involving these investment options are performed in the open market at fair value and qualify as party-in-interest transactions. Such transactions, while considered party-in-interest transactions under ERISA, are permitted under the provisions of the Plan and are specifically exempt from the prohibition of party-in-interest transactions under ERISA. The Plan paid $28,000 to T. Rowe Price Trust Company in fees and expenses for the year ended December 31, 2013. Of this amount, Plan participants paid $8,000 in redemption fees and $20,000 in loan origination fees. Redemption fees, third party advice services and loan origination fees are included in other expenses in the statement of changes in net assets available for Plan benefits.
6. Plan Termination
Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of Plan termination, participants will become fully vested in their employer contributions.
7. Tax Status
The IRS has determined and informed the Company by letter, dated September 25, 2002, that the Plan and related trust are designed in accordance with the applicable sections of the Internal Revenue Code (“IRC”). The Plan has been amended since receiving the determination letter and, effective January 1, 2010, the Plan was amended and restated by adopting a prototype plan, which the IRS had determined as of March 31, 2008 was designed in accordance with the applicable sections of the IRC. Effective as of March 31, 2014, the IRS determined that an updated version of the prototype plan is designed in accordance with the applicable sections of the IRC, and the Plan must be amended and restated no later than April 30, 2016 by adopting the updated prototype plan.
The Plan administrator and the Plan’s tax counsel believe that the Plan is designed and currently being operated in compliance with the applicable requirements of the IRC. Therefore, no provision for income taxes has been included in the Plan’s financial statements.
Accounting principles generally accepted in the United States of America require Plan management to evaluate tax positions taken by the Plan and recognize a tax liability if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2013, there are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits relative to the Plan for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to the fiscal year ended June 30, 2009.
8. Risks and Uncertainties
The Plan invests in various types of investment securities, including mutual funds, actively managed funds, common collective trust funds and Western Digital Corporation common stock. Investment securities are exposed to various risks, such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term, and that such changes could materially affect participant account balances and the amounts reported in the statements of net assets available for Plan benefits and the statement of changes in net assets available for Plan benefits.
Additionally, certain mutual funds offered by the Plan invest in the securities of foreign companies, which involve special risks and considerations not typically associated with investing in U.S. companies. These risks include devaluation of currencies, less reliable information about issuers, different securities transaction clearance and settlement practices, and possible adverse political and economic developments. Moreover, securities of many foreign companies and their markets may be less liquid and their prices more volatile than similar types of securities of comparable U.S. companies.
As of December 31, 2013 and 2012, 8% and 7%, respectively, of total Plan investments were invested in Western Digital Corporation common stock. For risks and uncertainties regarding Western Digital Corporation, please refer to the risk factors presented in Western Digital Corporation’s most recent Form 10-K and Form 10-Q filed with the Securities and Exchange Commission.

15

Table of Contents

9. Reconciliation of the Financial Statements to the Form 5500
The following is a reconciliation of net assets available for Plan benefits per the financial statements to the Form 5500 as of December 31, 2013 and 2012 (in thousands): 
 
 
December 31,
 
 
2013
 
2012
Net assets available for Plan benefits per the financial statements
 
$
828,839

 
$
603,612

Adjustment from contract value to fair value for fully benefit-responsive investment contracts (common collective trust funds)
 
1,616

 
4,335

Net assets available for Plan benefits per the Form 5500
 
$
830,455

 
$
607,947


The following is a reconciliation of the net increase in net assets available for Plan benefits per the financial statements to the Form 5500 for the year ended December 31, 2013 (in thousands): 
 
 
Total net increase in net assets available for Plan benefits per the financial statements
$
225,227

Net impact of adjustment from contract value to fair value for fully benefit-responsive investment contracts (common collective trust funds)
(2,719
)
Total net increase in net assets available for Plan benefits per the Form 5500
$
222,508


16

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
EIN: 95-2647125 Plan #: 003
Schedule H, Line 4i — Supplemental Schedule of Assets (Held at End of Year)
December 31, 2013
(in thousands)
 
 
 
Identity of Issue, Borrower, Lessor
or Similar Party
Description of Investment,
Including Collateral or Par Value
Current
Value
Common Stock:
 
 
* Western Digital Corporation
767 shares common stock, $.01 par value
$
64,342

Mutual Funds:
 
 
Bond Funds:
 
 
Pacific Investment Management Company
3,514 shares PIMCO Total Return Fund II
35,810

Pacific Investment Management Company
1,035 shares PIMCO Real Return Fund
11,351

Stock Funds:
 
 
* T. Rowe Price Trust Company
826 shares T. Rowe Price Science & Technology Fund
32,290

* T. Rowe Price Trust Company
1,311 shares T. Rowe Price Equity Income Fund
43,052

* T. Rowe Price Trust Company
849 shares T. Rowe Price Small-Cap Value Fund
42,747

* T. Rowe Price Trust Company
930 shares T. Rowe Price Mid-Cap Growth Fund
67,659

* T. Rowe Price Trust Company
825 shares T. Rowe Price Dodge & Cox International Stock Fund
35,495

* T. Rowe Price Trust Company
500 shares T. Rowe Price Prime Reserve Fund
500

* T. Rowe Price Trust Company
176 shares Retirement Income Fund
2,608

* T. Rowe Price Trust Company
149 shares Retirement 2005 Fund
1,931

* T. Rowe Price Trust Company
253 shares Retirement 2010 Fund
4,507

* T. Rowe Price Trust Company
1,320 shares Retirement 2015 Fund
18,907

* T. Rowe Price Trust Company
2,172 shares Retirement 2020 Fund
44,278

* T. Rowe Price Trust Company
3,038 shares Retirement 2025 Fund
46,718

* T. Rowe Price Trust Company
1,902 shares Retirement 2030 Fund
42,981

* T. Rowe Price Trust Company
1,990 shares Retirement 2035 Fund
32,400

* T. Rowe Price Trust Company
1,006 shares Retirement 2040 Fund
23,556

* T. Rowe Price Trust Company
908 shares Retirement 2045 Fund
14,167

* T. Rowe Price Trust Company
797 share Retirement 2050 Fund
10,406

* T. Rowe Price Trust Company
346 shares Retirement 2055 Fund
4,471

Prudential Jennison Small Company Fund
428 shares Prudential Jennison Small Company Fund
12,294

Mainstay Large Cap
3,064 shares Mainstay Large Cap Growth Fund
31,896

American Funds EuroPacific
144 shares American Funds EuroPacific Growth Fund
7,061

JP Morgan Mid Cap Value Fund
227 shares JP Morgan Mid Cap Value Fund
7,981

Total mutual funds
 
575,066

Common Collective Trust Funds:
 
 
* T. Rowe Price Trust Company
114,063 units T. Rowe Price Stable Value Fund
115,680

* T. Rowe Price Trust Company
2,942 units T. Rowe Price Equity Index Trust
60,860

Total common collective trust funds
 
176,540

Other:
 
 
* Tradelink Investments
Various publicly traded equity and mutual fund investments
1,422

Total Investments
 
817,370

* Notes Receivable from Participants
Interest rates range from 4.25% to 9.25% maturing at various dates through 2026; balances collateralized by vested participant accounts
11,324

 
 
$
828,694

*
 Party-in-interest.
Note: Cost information is not required for participant directed investments.

17

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
EIN: 95-2647125 Plan #: 003
Schedule H, Line 4a — Supplemental Schedule of Delinquent Participant Contributions
Year Ended December 31, 2013
(in thousands)
 
 
Total that Constitute Nonexempt Prohibited Transactions
Participant Contributions Transferred Late to the Plan
 
Contributions Not Corrected (1)
 
Contributions Corrected Outside VFCP (1)
 
Contributions Pending Corrections in VFCP (1)
 
Total Fully Correct Under VFCP and PTE 2002-51
$
8,424

 
$
5,106

 
$
3,318

 
$

 
$

þ
Check here if late participant loan repayments are included.
(1)
Participant contributions were not funded within the time periods prescribed by DOL Regulation 2510.3-102. The Company calculated the interest on the delinquent contributions and transmitted a portion of the remaining lost earnings to the Plan in calendar 2013 and will transmit the remaining lost earnings to the Plan in calendar 2014.


18

Table of Contents

WESTERN DIGITAL CORPORATION 401(k) PLAN
INDEX TO EXHIBITS
 
 
 
 
Exhibit
  
Description
23.1
  
Consent of Independent Registered Public Accounting Firm — BDO USA, LLP


19