Market-Driven Technology Investing IDEMA Financial Conference Dr. Hossein Moghadam Senior Vice President Research and Development November 4, 2004

Safe Harbor During the course of this presentation and subsequent panel discussions, representatives of Western Digital may be making forward-looking statements. These statements can often be identified by the use of forward-looking words, such as "may," "will," "could," "project," "believe," "anticipate," "expect," "estimate," "continue," "potential," "plan," "forecasts," and the like. These forward-looking statements are based on management's current expectations, and actual results could differ materially as a result of several factors, including the factors which are listed in WD’s recent Form 10-K filed with the SEC and its other recent SEC filings, to which your attention is directed.

Investment Growth in New Markets R&D, Capital Equipment, HDD Manufacturing Technology Desktop Mobile Enterprise Consumer Retail Vertical Investment Desktop Yesterday Today

Investment in Technology Multiple Applications Key Technology Investments Head transducer Electronics architecture Manufacturing technology Reliability Areal density Performance Low acoustics Power management Video streaming Ruggedness Data integrity Duty cycle (24/7) Reliability Performance Areal density Desktop Yesterday Today

Key Market Segment Attributes Leverage common attributes across design, manufacturing and technology Tailor end product to meet specific application requirements

Market-Driven Technology Investing IDEMA Financial Conference Dr. Hossein Moghadam Senior Vice President Research and Development November 4, 2004