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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."}],"balance_after":140371,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":419587,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-02-06T01:27:02.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":700,"price":85.7143,"value":60000.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $85.57 to a high of $85.84. 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."}],"balance_after":146625,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":419586,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-02-06T01:27:02.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":4473,"price":84.0386,"value":375904.6578,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $83.55 to a high of $84.50. 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."}],"balance_after":147325,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":419585,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-02-06T01:27:02.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":3000,"price":83.0477,"value":249143.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $82.55 to a high of $83.49. 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."}],"balance_after":151798,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":419584,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-02-06T01:27:02.000Z","date":"2018-02-05","kind":"sale","acquired":false,"shares":2084,"price":81.8097,"value":170491.4148,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $81.50 to a high of $82.47. 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."}],"balance_after":154798,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":419583,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-02-06T01:27:02.000Z","date":"2018-02-05","kind":"exercise","acquired":true,"shares":16511,"price":44.78,"value":739362.58,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."}],"balance_after":156882,"source":{"system":"sec-edgar","filing":"0001266824-18-000039","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000039/edgardoc.xml","form_type":"4"}},{"id":420117,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Employee Stock Option (right to buy)","published_at":"2018-01-31T23:33:51.000Z","date":"2018-01-29","kind":"exercise","acquired":false,"shares":82554,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The option vested 25% one year from the grant date of 8/3/2016, and an additional 6.25% vested at the end of each three-month period through 11/3/2017.  The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 8/3/2020."}],"balance_after":181616,"derivative":{"exercise_price":44.78,"exercise_date":"2017-08-03","expiration_date":"2023-08-03","underlying":"Common Stock","underlying_shares":82554},"source":{"system":"sec-edgar","filing":"0001266824-18-000030","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000030/edgardoc.xml","form_type":"4"}},{"id":420116,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-01-31T23:33:51.000Z","date":"2018-01-29","kind":"sale","acquired":false,"shares":8212,"price":89.4183,"value":734303.0796,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $89.22 to a high of $89.76. 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."}],"balance_after":140371,"source":{"system":"sec-edgar","filing":"0001266824-18-000030","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000030/edgardoc.xml","form_type":"4"}},{"id":420115,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-01-31T23:33:51.000Z","date":"2018-01-29","kind":"sale","acquired":false,"shares":26433,"price":88.6935,"value":2344435.2855,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $88.22 to a high of $89.21. 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."}],"balance_after":148583,"source":{"system":"sec-edgar","filing":"0001266824-18-000030","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000030/edgardoc.xml","form_type":"4"}},{"id":420114,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-01-31T23:33:51.000Z","date":"2018-01-29","kind":"sale","acquired":false,"shares":56110,"price":87.6571,"value":4918439.881,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $87.22 to a high of $88.21. 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."}],"balance_after":175016,"source":{"system":"sec-edgar","filing":"0001266824-18-000030","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000030/edgardoc.xml","form_type":"4"}},{"id":420113,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2018-01-31T23:33:51.000Z","date":"2018-01-29","kind":"exercise","acquired":true,"shares":82554,"price":44.78,"value":3696768.12,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on October 30, 2017."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 63 shares acquired under the Issuer's Employee Stock Purchase Plan on November 30, 2017."}],"balance_after":231126,"source":{"system":"sec-edgar","filing":"0001266824-18-000030","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000030/edgardoc.xml","form_type":"4"}},{"id":420423,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Dividend Equivalent Rights","published_at":"2018-01-18T00:13:16.000Z","date":"2018-01-16","kind":"grant","acquired":true,"shares":1946.6051,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"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."}],"balance_after":9196.0597,"derivative":{"underlying":"Common Stock","underlying_shares":1946.6051},"source":{"system":"sec-edgar","filing":"0001266824-18-000025","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682418000025/edgardoc.xml","form_type":"4"}},{"id":422945,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Dividend Equivalent Rights","published_at":"2017-10-17T01:58:22.000Z","date":"2017-10-16","kind":"grant","acquired":true,"shares":1869.7037,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"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."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"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."}],"balance_after":7249.4546,"derivative":{"underlying":"Common Stock","underlying_shares":1869.7037},"source":{"system":"sec-edgar","filing":"0001266824-17-000216","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682417000216/edgardoc.xml","form_type":"4"}},{"id":423470,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Dividend Equivalent Rights","published_at":"2017-09-13T23:40:02.000Z","date":"2017-09-11","kind":"exercise","acquired":false,"shares":674.4685,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The dividend equivalents were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalents relate.  A cash amount equal to $40.94 was also paid to the holder to settle a fractional dividend equivalent of 0.4685."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The dividend equivalents were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalents relate.  A cash amount equal to $40.94 was also paid to the holder to settle a fractional dividend equivalent of 0.4685."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The dividend equivalents were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalents relate.  A cash amount equal to $40.94 was also paid to the holder to settle a fractional dividend equivalent of 0.4685."}],"balance_after":5379.7509,"derivative":{"underlying":"Common Stock","underlying_shares":674.4685},"source":{"system":"sec-edgar","filing":"0001266824-17-000200","document":"edgardoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682417000200/edgardoc.xml","form_type":"4"}},{"id":423469,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2017-09-13T23:40:02.000Z","date":"2017-09-11","kind":"tax_withholding","acquired":false,"shares":4269,"price":87.38,"value":373025.22,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e)."}],"balance_after":148509,"source":{"system":"sec-edgar","filing":"0001266824-17-000200","document":"edgardoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/106040/000126682417000200/edgardoc.xml","form_type":"4"}},{"id":423468,"issuer":{"id":1010,"kind":"organization","name":"WESTERN DIGITAL CORP","symbol":"WDC"},"owners":[{"id":15839,"kind":"person","name":"MILLIGAN STEPHEN D","position":1,"cik":"0001277246","reported_name":"MILLIGAN STEPHEN D","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2017-09-13T23:40:02.000Z","date":"2017-09-11","kind":"exercise","acquired":true,"shares":674,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The dividend equivalents were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of restricted stock units to which the dividend equivalents relate.  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