X0306 4 2020-01-21 0 0000106040 WESTERN DIGITAL CORP WDC 0001201490 CORDANO MICHAEL D C/O WESTERN DIGITAL CORPORATION 5601 GREAT OAKS PARKWAY SAN JOSE CA 95119 0 1 0 0 President and COO Common Stock 2020-01-23 4 S 0 12872 70.6882 D 248946 D Common Stock 2020-01-23 4 S 0 1834 71.5597 D 247112 D Dividend Equivalent Rights 2020-01-21 4 A 0 699.3504 0.0 A Common Stock 699.3504 6076.8562 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 7, 2019. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $70.16 to a high of $71.15. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $71.19 to a high of $71.99. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. The dividend equivalent rights accrued on previously awarded restricted stock units (RSUs) which vest proportionately with the RSUs to which they relate. Each dividend equivalent right represents a contingent right to receive one share of the Issuer's common stock or the cash value thereof. By: /s/ Sandra Garcia Attorney-in-Fact For: Michael D. Cordano 2020-01-23