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Investor Relations
Q & A

The following Questions and Answers are related to the company's acquisition of SiliconSystems, Inc., announced
March 30, 2009.

1.Who are SiliconSystems?
 http://www.siliconsystems.com/about/about.aspx
2.What are SiliconSystems’ products?
 http://www.siliconsystems.com/products/products.aspx
3.What are SiliconSystems’ markets?
 http://www.siliconsystems.com/applications/applications.aspx
4.What are SiliconSystems’ technologies?
 http://www.siliconsystems.com/technology/technology.aspx
5.How big is the solid-state drive market?
 a. In 2008 it is estimated at $1.1 billion.
 b. The largest sub-segment was embedded systems at $400 million.
     i. The majority of SiliconSystems’ current business is in the embedded systems segment.
6.Who are SiliconSystems’ customers?
 a. SiliconSystems serves a broad customer base, including many Fortune 500 companies in the network-communications, industrial equipment, medical, aerospace and military markets.
 b. The top-ten customers represent approximately 40% of the business.
 c. The majority of these customers are new WD customers.
7.Who are their competitors and suppliers?
 a. Main competitors are STEC, Adtron (Smart Modular), Hagiwara Sys-Com.
 b. We do not disclose supplier names; this is company policy.
8.How will this impact WD’s OPEX?
 a. Impact to our operating expense model will be minimal.
9.What is SiliconSystems’ historical business model?
 a. Gross margins are higher than any of WD’s existing businesses.
 b. OPEX is higher, due to higher support requirements.
10. Is SiliconSystems profitable?
 a. Yes, founded in 2002, SiliconSystems has been profitable since 2005.
11. What portions of SiliconSystems is WD acquiring?
 a. The entire company.
12. When does WD expect the acquisition to be accretive?
 a. Immediately.
13.Will SiliconSystems be absorbed into WD or operate separately?
 a. SiliconSystems will operate as WD’s Solid-State Storage business unit, similar to our existing business units of Branded Products, Client Storage, Consumer Storage, and Enterprise Storage.
14.When will WD market an SSD for computing applications?
 a. Today’s acquisition strengthens and accelerates our ability to get to market with additional SSD products. We announce new products when they begin shipping.
 b. WD implements new products and technologies that are meaningful to customers and at a time when the company can maximize the critical balance of cost, reliability, quality and availability, while meeting our customers’ needs.
15.Does this acquisition displace WD’s traditional enterprise development?
 a. Both magnetic and solid-state technologies are complementary in enterprise applications, especially in emerging tiered-storage architectures.
16.How many employees does SiliconSystems have? Does WD plan to keep all of them?
 a. WD plans to retain substantially all of the approximately 100 employees.
17.Will the incremental business be cash flow positive immediately?
 a. Yes.
18.What is the extent of the SiliconSystems asset base?
 a. Undisclosed.
19.Will this increase your projected CAPEX for the balance of FY 2009 and onwards into 2010?
 a. No, we do not expect a material change in our CAPEX outlook.
20.Will this have an impact on your tax rate?
 a. Impact to our effective tax rate will be minimal.
21.Will you have accounting entries and charges in the current quarter to reflect the purchase?
 a. Our purchase price allocation for accounting purposes is currently in process. We expect that some portion of the purchase price will be allocated to in-process research and development. In accordance with FAS 141, this amount will be recorded as a one-time charge during our fiscal third quarter, which ended on March 27, 2009.

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