Investor Presentaiton

9 © 2023 WESTERN DIGITAL CORPORATION OR ITS AFFILIATES ALL RIGHTS RESERVED Joint Venture Operational Framework For more information on Flash Ventures, please visit investor.wdc.com for a recently published Flash Ventures presentation. Western Digital. Co-develops flash (including process technology and memory design) with Kioxia and contributes IP for Flash Ventures' use Performs integral manufacturing and R&D functions at Flash Ventures' manufacturing sites Purchases Flash Ventures' wafers at cost plus a small markup Pays Flash Ventures' expenses (including equipment depreciation and lease expense) Funds Flash Ventures' equipment purchases (via loans, equity and lease guarantees) in excess of Flash Ventures' operating cash flow Flash Ventures 49.9% Owned by Western Digital 50.1% Owned by Kioxia Owns and leases equipment for flash wafer production and R&D line Purchases wafers from Kioxia at cost under foundry agreements Sells wafers to Western Digital and Kioxia at cost plus a small markup Charges expenses to Western Digital and Kioxia (including equipment depreciation and lease expense) Borrows from Western Digital and Kioxia for a portion of their equipment purchases Repays loans for equipment purchases using excess operating cash flow KIOXIA Co-develops flash (including process technology and memory design) with Western Digital and contributes IP for Flash Ventures' use Performs integral manufacturing and R&D functions at Flash Ventures' manufacturing sites Purchases Flash Ventures' wafers at cost plus a small markup Pays Flash Ventures' expenses (including equipment depreciation and lease expense) Funds Flash Ventures' equipment purchases (via loans, equity, and lease guarantees) in excess of Flash Ventures' operating cash flow Owns and operates cleanrooms Provides wafer manufacturing services to Flash Ventures at cost

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