WD'S New GreenPower(TM) Hard Drives Reduce Energy Consumption, Helping Protect the Environment Company's First One Terabyte Drive Enables Up To 40% Hard Drive Power

Savings for Desktop, Enterprise, CE and WD Branded Customers

    LAKE FOREST, Calif., July 23 /PRNewswire-FirstCall/ -- Western Digital
 Corp. (NYSE:   WDC) today announced a new environmentally friendly
 GreenPower(TM) family of WD(R) desktop, enterprise, CE and external hard
 drive products. The new GreenPower (GP) family will ship in capacities from
 320 gigabytes (GB) to one terabyte (TB), and will save up to 40% in hard
 drive power consumption, or as much as $10 per drive per year.
     Based on extensive customer input toward supporting ENERGY STAR 4.0
 compliance and incorporating the latest in engineering technology, WD has
 delivered the first 3.5-inch hard drive platform designed with power
 savings as the primary attribute. The GreenPower family gives customers
 more choices when it comes to purchasing hard drives. The initial drive
 that will take advantage of WD's new GreenPower technology is the WD Caviar
 GP. The WD Caviar GP 1 TB hard drive will first ship in July in the My
 Book(TM) range of storage appliances, with 1 TB desktop channel shipments
 following in August. GreenPower versions of WD RE enterprise drives and WD
 AV consumer electronics drives will ship in volume within calendar Q3.
     ENERGY STAR 4.0 computing systems are designed to enable organizations
 to minimize their carbon footprint as well as realize significant savings
 in electricity costs. By WD estimates, in certain applications, the new
 GreenPower platform can save greater than $10 per drive per year in
 electricity costs. For example, a data center with 10,000 drives can save
 $100,000 in annual energy costs, and reduce CO2 emission by 600 metric tons
 -- the equivalent of taking almost 400 cars off the road for a year.
                                                                  Days of
                                                              (Based on Avg.
     Segment     Hours/     Power      $/    TCO$/    Kg of      Daily CO2
                  Year   Multiplier  KWatt   year     CO2        Emissions)
     Enterprise   8760     2.40(1)  $0.12(4) $10.09  60.5(5)      14(6)
     CE           8760     1.25(2)  $0.12(4) $5.26   31.5(5)       7(6)
                           1.54(3)           $6.48   38.9(5)       9(6)
     Desktop      3120     1.25(2)  $0.12(4) $1.87   11.2(5)       3(6)
                           1.54(3)           $2.31   13.8(5)       3(6)
     "With the GreenPower family, WD is improving the environment while
 reducing cost of ownership," said John Coyne, WD president and chief
 executive officer. "Our focus on energy efficiency benefits commercial
 customers and consumers alike."
     Other 1 TB hard drives have a typical power consumption of 13.5 watts.
 Replacing these drives with WD GreenPower hard drives can cut that rating
 by over 5 watts, significantly reducing heat, power consumption and cost.
     Ensuring Energy Efficiencies:
     The GreenPower Platform is designed with power savings as the primary
 attribute. GreenPower drives from WD deliver exceptional power
 conservation, ultra-cool, quiet operation and solid performance.
     The following technologies enable WD's GP platform.
      *    IntelliPower(TM): A fine-tuned balance of spin speed, transfer rate
           and cache size designed to deliver both significant power savings
           and solid performance.
      *    IntelliPark(TM): Delivers lower power consumption by automatically
           unloading the heads during idle to reduce aerodynamic drag.
      *    IntelliSeek(TM): Calculates optimum seek speeds to lower power
           consumption, noise and vibration.
     For more information on WD's new GP hard drive family, visit WD at
     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 produces reliable,
 high-performance hard drives that keep users' data close-at-hand and secure
 from loss. WD applies its storage expertise to consumer products for
 external, portable and shared storage products.
     WD was founded in 1970. The company's storage products are marketed to
 leading 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.
     This press release contains forward-looking statements, including
 statements relating to expected shipment dates, pricing and availability of
 GreenPower platform hard drives. These forward-looking statements are based
 on current management expectations, and actual results may differ
 materially as a result of several factors, including: supply and demand
 conditions in the hard drive industry and business conditions generally;
 and other risks and uncertainties listed in WD's recent SEC filings,
 including its form 10-Q for the third fiscal quarter of fiscal 2007. WD
 undertakes no obligation to update these forward-looking statements to
 reflect new information or events or for any other reason.
     Western Digital, WD, the WD logo and WD Caviar are registered
 trademarks and IntelliPower, IntelliSeek, IntelliPark and GreenPower are
 trademarks of Western Digital Technologies, Inc. All other brand and
 product names mentioned herein are the property of their respective owner.
     Editorial Note:
     Source#1: Total facility power vs. IT equipment power
 IT_Equipment_Data_Centers041807.pdf and
     Source#2: Assumes Energy Star 4.0 power supply (80%)
     Source#3: Assumes typical power supply (65%)
     Source#4: Common industry number 20655_Green_Whitepaper_0601307_ry.pdf
 and http://www.climatesaverscomputing.org/program/whitepaper.html
     Source #5: Assumes 1.60 Metric tons/year
 tat ion_at_ITS.pdf
     Reference ENERGY STAR:
     Source #6: Assumes 1.60 CO2 pounds per Kwatt/Hours/Year (Calculation of
 automobile emissions depends on the car's g/km emission levels and km/year
 of driving).
     (Logo: http://www.newscom.com/cgi-bin/prnh/20000711/WDCLOGO )

SOURCE Western Digital Corp.

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