

<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
<!-- Version: 6.20.1 -->
<!-- Round: 6 -->
<!-- Creation date: 2013-05-02T18:25:46Z -->
<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
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        <link:definition>125 - Disclosure - Auction Rate Securities (Tables)</link:definition>
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        <link:definition>126 - Disclosure - Inventories (Tables)</link:definition>
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        <link:definition>128 - Disclosure - Share-Based Compensation (Tables)</link:definition>
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        <link:definition>129 - Disclosure - Segment, Customers, and Geographic Information (Tables)</link:definition>
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        <link:definition>130 - Disclosure - Purchased Intangibles (Tables)</link:definition>
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        <link:definition>131 - Disclosure - Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail)</link:definition>
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        <link:definition>132 - Disclosure - Net Income Per Share - Additional Information (Detail)</link:definition>
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        <link:definition>133 - Disclosure - Fair Value - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)</link:definition>
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        <link:definition>135 - Disclosure - Fair Value - Changes in Fair Value of Contingent Consideration (Detail)</link:definition>
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        <link:definition>147 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
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</schema>





