Western Digital's AI Storage Bet Rests on 89% Cloud Revenue

Western Digital's past decade was defined by its 2016 SanDisk acquisition, which turned it into a combined flash and HDD giant but tied it to NAND pricing. NAND busts in 2018-2019 and 2022-2023 gutted earnings, and activist Elliott Management pressed for a breakup, leading to the February 2025 spin-off of the flash unit as Sandisk.

That left Western Digital as a pure-play hard drive company just as AI storage demand arrived. Management says roughly 80% of data stored in a hyperscale data center resides on hard disk drives. The company's case today holds if AI keeps exabyte demand growing "25% plus" and long-term agreements stretching toward 2031 lock in pricing.

The result hinges on whether hyperscaler demand holds, and the decade shows what it takes to hold a cyclical business: you sit through five flat years and two halvings, and nearly all the return shows up in one year.