Exhibit 99.1

Company contacts:
Steve Shattuck	Bob Blair
Public Relations	Investor Relations
949.672.7817	949.672.7834
steve.shattuck@wdc.com	robert.blair@wdc.com

FOR IMMEDIATE RELEASE:

WD^® ANNOUNCES FISCAL Q2 REVENUE OF $2.6 BILLION WITH
NET INCOME OF $429 MILLION, OR $1.85 PER SHARE

Revenue Up 44 Percent, Hard Drive Shipments Up 39 Percent,
From Year-ago Quarter

LAKE FOREST, Calif. — Jan. 21, 2010 — Western Digital Corp. (NYSE: WDC) today reported revenue of $2.6 billion, hard drive shipments of 49.5 million units and net income of $429 million, or $1.85 per share, for its second fiscal quarter ended Jan. 1, 2010. In the year-ago quarter, the company reported revenue of $1.8 billion, hard drive shipments of 35.5 million units, and net income of $14 million. The year-ago net income included $113 million of restructuring charges.

     The company generated a record $557 million in cash from operations during the second quarter, ending with total cash and cash equivalents of $2.4 billion.

     “We are very pleased with WD’s strong financial performance in our second fiscal quarter,” said John Coyne, president and chief executive officer. “For the third consecutive quarter, we increased output in a supply constrained environment, providing strong support of our customers’ growth opportunities, primarily in the consumer segment but, notably, with some emerging strength in the commercial sector. Continued customer preference for WD products, our timely investments in capital, the support of our supply partners and outstanding execution

WD Announces Fiscal Q2 Revenue of $2.6 Billion With
Net Income of $429 Million, or $1.85 Per Share
Page 2

by the WD team generated record revenue and profits. A moderate pricing environment, combined with our passionate focus on cost and efficiency, enabled gross margins of 26.2 percent—well above the high end of our model range.”

     The investment community conference call to discuss these results will be broadcast live over the Internet today at 2 p.m. Pacific/5 p.m. Eastern. The call will be accessible live and on an archived basis via the link below:

Audio Webcast:	www.westerndigital.com/investor
	Click on “Conference Calls”
Telephone Replay:	800-925-0904 (toll-free)
	+1-203-369-3093 (international)

About WD

     WD, one of the storage industry’s pioneers and long-time leaders, provides products and services for people and organizations that collect, manage and use digital information. The company designs and produces reliable, high-performance hard drives and solid state drives that keep users’ data accessible and secure from loss. Its advanced technologies are configured into applications for client and enterprise computing, embedded systems and consumer electronics, as well as its own consumer storage and media products.

     WD was founded in 1970. The company’s storage products are marketed to leading OEMs, systems manufacturers, selected resellers and retailers under the Western Digital^® and WD brand names. Visit the Investor section of the company’s Web site (www.westerndigital.com) to access a variety of financial and investor information.

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Western Digital, WD, and the WD logo are registered trademarks of Western Digital Technologies, Inc. All other trademarks mentioned herein belong to their respective owners.

WESTERN DIGITAL CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(in millions; unaudited)

	Jan. 1,		Jul. 3,
	2010		2009
ASSETS
Current assets:
Cash and cash equivalents	$	2,435	$	1,794
Accounts receivable, net		1,365		926
Inventories		453		376
Other		163		134
Total current assets		4,416		3,230
Property and equipment, net		1,696		1,584
Goodwill		139		139
Other intangible assets, net		83		89
Other assets		251		249
Total assets	$	6,585	$	5,291
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	1,507	$	1,101
Accrued expenses		288		247
Accrued warranty		118		95
Current portion of long-term debt		94		82
Total current liabilities		2,007		1,525
Long-term debt		350		400
Other liabilities		237		174
Total liabilities		2,594		2,099
Shareholders’ equity		3,991		3,192
Total liabilities and shareholders’ equity	$	6,585	$	5,291

WESTERN DIGITAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(in millions, except per share amounts)
(unaudited)

	Three Months Ended						Six Months Ended
	Jan. 1,			Dec. 26,			Jan. 1,			Dec. 26,
	2010			2008			2010			2008
Revenue, net	$	2,619		$	1,823		$	4,827		$	3,933
Cost of revenue		1,932			1,533			3,626			3,219
Gross margin		687			290			1,201			714
Operating expenses:
Research and development		154			119			296			252
Selling, general and administrative		60			42			113			99
Restructuring		—			113			—			113
Total operating expenses		214			274			409			464
Operating income		473			16			792			250
Net interest and other		(2	)		(9	)		(4	)		(13	)
Income before income taxes		471			7			788			237
Income tax provision (benefit)		42			(7	)		71			12
Net income	$	429		$	14		$	717		$	225
Income per common share:
Basic	$	1.89		$	0.06		$	3.17		$	1.01
Diluted	$	1.85		$	0.06		$	3.10		$	1.00
Common shares used in computing per share amounts:
Basic		227			222			226			222
Diluted		232			224			231			225

WESTERN DIGITAL CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions; unaudited)

	Three Months Ended						Six Months Ended
	Jan. 1,			Dec. 26,			Jan. 1,			Dec. 26,
	2010			2008			2010			2008
Cash flows from operating activities
Net income	$	429		$	14		$	717		$	225
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization		126			122			247			239
Stock-based compensation		13			11			27			21
Deferred income taxes		(5	)		(7	)		(5	)		(7	)
Loss on investments		—			6			—			9
Non-cash portion of restructuring		—			80			—			80
Changes in operating assets and liabilities		(6	)		74			5			34
Net cash provided by operating activities		557			300			991			601
Cash flows from investing activities
Purchases of property and equipment		(199	)		(140	)		(375	)		(302	)
Sales and maturities of investments		3			—			3			1
Net cash used in investing activities		(196	)		(140	)		(372	)		(301	)
Cash flows from financing activities
Issuance of stock under employee stock plans, net		26			10			40			9
Increase (decrease) in excess tax benefits from employee stock plans		11			(4	)		20			4
Repurchases of common stock		—			—			—			(36	)
Repayment of long-term debt		(19	)		(3	)		(38	)		(5	)
Net cash provided by (used in) financing activities		18			3			22			(28	)
Net increase in cash and cash equivalents		379			163			641			272
Cash and cash equivalents, beginning of period		2,056			1,213			1,794			1,104
Cash and cash equivalents, end of period	$	2,435		$	1,376		$	2,435		$	1,376