Q3 FY19 Financial Results

Executive Summary S→ ° RESULTS GENERALLY CONSISTENT WITH OUR EXPECTATIONS . • . Incremental improvement in demand for capacity enterprise and client compute Flash industry dynamics remain challenging Expecting both flash and HDD demand to further improve for the balance of CY19 PRODUCT PORTFOLIO STRONGEST IN OUR HISTORY • • O FLASH Began shipments of internally developed BICS4 NVMe client SSDs and BiCS3 NVMe enterprise SSDs Leading the industry's transition to BiCS4 technology BiCS4 to become highest volume runner in terms of flash output in second half of CY19 HDD Capacity Enterprise-continue to lead in areal density and capacity points Leading the industry's transition to 14TB capacity • On track to launch 16TB and 18TB energy assisted recording drives in CY19 EXECUTING WELL TO COST AND EXPENSE REDUCTION PLANS • On track to achieve projected non-GAAP operating expense reductions by September 2019 quarter and non-GAAP cost reductions exiting the December 2019 quarter WELL POSITIONED TO EMERGE STRONGER . Significant expansion of product portfolio, deeper customer engagement and rightsized manufacturing footprint Western Digital. ©2019 Western Digital Corporation or its affiliates. All rights reserved. 4/29/19

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