Q3 FY19 Financial Results

Quarterly Fact Sheet Footnotes FORMULAS Days Sales Outstanding (DSO) = Accounts Receivable/ (Revenue / 91 days) Days Inventory Outstanding (DIO) = Inventories / (Cost of Revenue / 91 days) Days Payables Outstanding (DPO) = Accounts Payable (including Accounts Payable to Related Parties) / (Cost of Revenue / 91 days) Cash Conversion Cycle = DSO + DIO - DPO FOOTNOTES Client Devices is comprised of notebook and desktop HDD, consumer electronics HDD, client SSD, embedded, wafer sales and licensing and royalties. Client Solutions is comprised of branded HDD, branded flash, removables and licensing and royalties. Data Center Devices and Solutions is comprised of enterprise HDD, enterprise SSD, data center software, data center solutions and licensing and royalties. Excludes licensing, royalties, and non-memory products. ③ Refer to the GAAP to non-GAAP reconciliation slides within the Appendix for further details. 4 Free cash flow is a non-GAAP financial measure defined as cash flows provided by operating activities less purchases of property, plant and equipment, net of proceeds from sales of property, plant and equipment, and the activity related to Flash Ventures, net. We consider free cash flow to be useful as an indicator of our overall liquidity, as the amount of free cash flow generated in any period is representative of cash that is available for strategic opportunities or other business purposes including, among others, investing in the company's business, making strategic acquisitions, strengthening the balance sheet, repaying debt, paying dividends and repurchasing stock. Free cash flow is not an alternative for measures prepared in accordance with GAAP and may be different from non-GAAP free cash flow measures used by other companies. 5 Client compute products consist primarily of desktop and notebook HDDs, excluding those sold through retail channels. 6 Non-compute products consist of retail channel and consumer electronics HDDs. Data center products consist of enterprise HDDs (high-capacity and performance) and enterprise systems. 8 HDD Unit volume excludes data storage systems and media. 9 HDD ASP is calculated by dividing HDD revenue by HDD units. Data storage systems are excluded from this calculation, as data storage systems ASP is measured on a per system basis rather than a per drive basis. Western Digital. ©2019 Western Digital Corporation or its affiliates. All rights reserved. 4/29/19 9

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