Stock-based compensation expense: Stock-based compensation expense consists of expenses recorded under SFAS 123(R), "Share-Based Payment," in connection with stock awards such as stock options, restricted stock awards and restricted stock units granted under the Company's equity incentive plans and shares issued pursuant to the Company's employee stock purchase plan. The Company excludes stock-based compensation expense from non-GAAP financial measures because it is a non-cash measurement that does not reflect the Company's ongoing business; the Company believes that the provision of non-GAAP information that excludes stock-based compensation improves the ability of investors to compare its period- over-period operating results, as there is significant variability and unpredictability across companies with respect to this expense.

Amortization of acquisition-related intangible assets: Amortization of acquisition-related intangible assets primarily relate to core and existing technologies, customer relationships and backlog that were acquired from prior acquisitions. The Company excludes the amortization of acquisition-related intangible assets because it does not reflect the Company's ongoing business. In addition, in accordance with GAAP, the Company generally recognizes expenses for internally-developed intangible assets as they are incurred, notwithstanding the potential future benefit such assets may provide. Unlike internally-developed intangible assets, however, and also in accordance with GAAP, the Company generally capitalizes the cost of acquired intangible assets and recognizes that cost as an expense over the useful lives of the assets acquired (other than goodwill, which is not amortized, and acquired in-process technology, which is expensed immediately, as required under GAAP). As a result of their GAAP treatment, there is an inherent lack of comparability between the financial performance of internally-developed intangible assets and acquired intangible assets. Accordingly, the Company believes it is useful to provide, as a supplement to its GAAP operating results, a non-GAAP financial measure that excludes the amortization of acquired intangible assets in order to enhance the period-over-period comparison of its operating results, as there is significant variability and unpredictability across companies with respect to this expense. The amortization of acquisition-related intangible assets for core and existing technologies and backlog from the Company's acquisition of Aristos Logic Corporation is being reflected as cost of revenues, while the amortization of acquisition- related intangible assets for customer relationships is being reflected as part of operating expenses.

Restructuring charges, other charges (gains), net, and impairment of goodwill: Restructuring charges primarily relate to activities engaged in by the Company's management to simplify its infrastructure. Other charges (gains), net, primarily relate to an impairment of acquisition-related intangible assets from a prior acquisition and a gain on sale of long-lived assets. Restructuring charges, other charges (gains), net, and impairment of goodwill, are excluded from non-GAAP financial measures because they are not considered to be part of core operating activities and the occurrence of such costs is infrequent. Although the Company has engaged in various restructuring activities over the past several years, each has been a discrete, individual event based on a unique set of business objectives. The Company does not engage in restructuring activities in the ordinary course of business. As such, the Company believes it is appropriate to exclude restructuring charges from its non-GAAP financial measures, as it enhances the ability of investors to compare the Company's period-over-period operating results. In addition, the Company excludes impairment of goodwill, including the impairment of acquisition-related intangible assets recorded as part of other charges (gains), net, from non-GAAP financial measures because such charges are a non-cash measurement that do not reflect the Company's ongoing business.

Gain on extinguishment of debt and sale of marketable equity securities: The gain on extinguishment of debt relates to repurchases of the Company's 3/4% convertible notes in the open market. The gain on marketable equity securities relates to the sale of shares of a publically traded company in the open market due to the planned merger between the publically traded company and another company announced in February 2009. The gain on extinguishment of debt and sale of marketable equity securities are excluded from non-GAAP financial measures because the occurrence of such costs is infrequent, which would affect the ability of investors to compare the Company's period-over-period operating results, and because the Company does not believe that these activities are reflective of gains and losses customarily incurred in the management of its cash resources.

Income taxes: Income taxes relates to incremental income taxes associated with certain non- GAAP items and tax provisions and refunds from certain discrete tax events that occurred during fiscal 2009.

Discontinued operations: Discontinued operations relates to the sale of the Snap Server NAS business. Certain items from discontinued operations are excluded from non-GAAP financial measures, which include the gain (loss) on disposal of discontinued operations and certain expenses discussed above related to stock-based compensation, amortization of acquisition-related related intangible assets and income taxes. The gain (loss) on disposal of discontinued operations is excluded from non-GAAP financial measures because the occurrence of such costs is infrequent, which would affect the ability of investors to compare the Company's period-over-period operating results, and because the Company does not believe that this activity is reflective of gains and losses customarily incurred in the management of its cash resources.