Q3 FY19 Financial Results

GAAP to Non-GAAP Reconciliation In millions, except EPS and percentages; unaudited THREE MONTHS ENDED 12/28/2018 $ (487) 3/29/2019 $ (581) GAAP NET INCOME (LOSS) Amortization of acquired intangible assets Stock-based compensation expense Employee termination, asset impairment and other charges Acquisition-related charges Charges related to cost saving initiatives Manufacturing underutilization charges Convertible debt activity, net Debt extinguishment costs Other Income tax adjustments NON-GAAP NET INCOME DILUTED INCOME (LOSS) PER COMMON SHARE GAAP Non-GAAP DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING GAAP Non-GAAP GAAP GROSS MARGIN Amortization of acquired intangible assets Stock-based compensation expense Charges related to cost saving initiatives Manufacturing underutilization charges NON-GAAP GROSS MARGIN HDD non-GAAP gross margin Flash non-GAAP gross margin NON-GAAP GROSS MARGIN 3/30/2018 $ 61 276 102 35 2 (2) 3 894 5 (259) $ 1,117 $0.20 $ 3.63 308 308 256 79 20 229 84 76 3 8 49 148 6 7 (3) 496 $ 424 28 55 $ 49 $ (1.68) $ 1.45 290 293 THREE MONTHS ENDED* $ (1.99) $ 0.17 292 294 3/30/2018 6/29/2018 9/28/2018 12/28/2018 3/29/2019 38.4% 36.2% 33.1% 24.7% 15.8% 4.7% 4.6% 4.7% 5.1% 5.1% 0.2% 0.2% 0.2% 0.3% 0.4% 0.1% 0.0% 0.0% 0.1% 1.1% 4.0% 43.4% 41.0% 38.0% 31.3% 25.3% 33% 55% 43.4% 32% 51% 41.0% 32% 44% 38.0% 27% 35% 31.3% 29% 21% 25.3% *GAAP gross margin is calculated by dividing GAAP gross profit by revenue. Non-GAAP gross margin is calculated by dividing non-GAAP gross profit by revenue. HDD non-GAAP gross margin is calculated by dividing HDD non-GAAP gross profit by HDD revenue. Flash non-GAAP gross margin is calculated by dividing Flash non-GAAP gross profit by Flash revenue. Western Digital. ©2019 Western Digital Corporation or its affiliates. All rights reserved. 4/29/19 13

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