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Western Digital Demonstrates Highest Hard Drive Density

WD Achieves 520 Gb/in2 Areal Density in Demonstration; Result of Ongoing Technology Investments

Western Digital Corp. (NYSE: WDC) today announced that it has achieved 520 Gb/in2 areal density – the hard drive industry’s highest demonstrated density to date using continuous media. The company revealed the milestone this week at the Perpendicular Magnetic Recording Conference in Tokyo after an earlier demonstration in California.

Following WD’s growing investments in technology the past five years, the company achieved 520 Gb/in2 using its own perpendicular magnetic recording (PMR)/tunneling magneto-resistive (TuMR) head technology. This level of density produces a 3.5-inch hard drive storing 640 GB-per-platter and single hard drive capacities as large as 3 TB. Based on the industry’s current density growth rate of more than 40 percent per year, those capacities are expected to be available in the 2010 timeframe.

Current industry-leading hard drive densities shipping in high volume are about 200 Gb/in2, as featured in WD’s 250 GB WD Scorpio 2.5-inch drive for notebooks and mobile applications, which began shipping in May 2007.

“WD was the first hard drive manufacturer to ship in volume the 250 GB capacity point in the 2.5-inch form factor,” said Hossein Moghadam, chief technology officer for WD. “Our technology investments position WD with our customers as a leading choice for the highest, cutting-edge capacities. Our top priority will be to remain keenly focused on providing the highest quality and reliability, which customers have come to expect from WD after years of relying on our products.”

WD demonstrated 520 Gb/in2 density in its Magnetic Head Operation labs in Fremont, Calif., earlier this month. Moghadam added, “The milestone was realized using our current-technology MgO reader, illustrating the extendibility of PMR-TuMR head technology generations into the future.”

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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 accessible and secure from loss. WD applies its storage expertise to consumer products for external, portable and shared storage applications.

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.

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