Western Digital Corporation

What does Western Digital own?
Western Digital owns its hard disk drive business, including the WD and WD_BLACK brands, Ultrastar enterprise drives, and manufacturing plants primarily in Thailand and Malaysia. Its former Flash business now trades separately as Sandisk Corporation.

Is Western Digital publicly traded?
Yes. It trades on Nasdaq under ticker WDC and is a member of the S&P 500.

Who founded Western Digital?
Alvin B. Phillips founded the company in 1970 in Newport Beach, California, originally as General Digital Corporation, a semiconductor test equipment maker.

Where is Western Digital headquartered?
The company is headquartered in San Jose, California, USA, in the Santa Teresa district.

What happened to SanDisk?
Western Digital separated its Flash memory business in February 2025, creating the independent public company Sandisk Corporation. Western Digital retained the hard disk drive business.

Who owns Western Digital?
Western Digital is an independent public company owned by its shareholders. No parent company or controlling investor exists.

Alvin B. Phillips, a former Motorola semiconductor engineer, founded General Digital Corporation in Newport Beach, California, in 1970. The company made MOS semiconductor test equipment before moving into calculator chips, adopting the Western Digital name in 1971. It spent the 1970s as a chipmaker, producing the popular FD1771 floppy disk controller and the MCP-1600 microprocessor used in early Digital Equipment systems.

A pivot in the 1980s turned the company toward storage controllers for the emerging PC market, and a 1988 acquisition of disk drive maker Tandon moved it into hard drive manufacturing itself. Through the 1990s Western Digital survived a brutal consolidation that eliminated most independent drive makers, building its franchise on reliable desktop drives sold under color-coded product lines.

Two transformational acquisitions followed. In 2012 it bought Hitachi Global Storage Technologies for approximately $4.8 billion, absorbing enterprise-class drive technology and becoming the largest HDD maker. In 2016 it paid approximately $19 billion for SanDisk, the flash memory pioneer, betting that a combined HDD and flash portfolio would dominate storage. The combination never fully delivered on its promise, and in 2023 the company announced plans to separate the two businesses after activist investor Elliott Management pushed for the split.

The separation completed on February 21, 2025: Sandisk Corporation took the Flash business, its brands, and its joint venture memory fabs with Kioxia, while Western Digital retained the hard disk drive operations built from HGST and its own development. On February 1, 2026, the company introduced a new WD logo and began operating under the WD name.

The strategy reset worked. Freed of the volatile flash cycle and riding unprecedented demand for mass storage from AI data centers, fiscal 2026 revenue rose 36% to $12.92 billion and free cash flow reached $3.51 billion. The company now guides HDDs as the foundation of mass data storage through the end of the decade.

Western Digital publishes sustainability reporting covering emissions, water use, and responsible minerals sourcing across its Asian manufacturing footprint, and participates in the Responsible Business Alliance code for electronics supply chains. It has set science-aligned emissions reduction targets for its operations and supply chain.

The company's practical environmental story is the energy efficiency of mass HDD storage versus keeping all data on flash, a point it raises in data center discussions. It is not a Certified B Corporation.

Western Digital's notable legal matters are industry-standard patent disputes, which it periodically litigates and settles, and occasional class actions over drive marketing or warranty practices, none material to the business.

The 2020s brought two policy issues rather than controversies. Its joint venture partner Kioxia and the memory industry were caught in US-China technology export controls, a factor in the timing of the Sandisk separation. And its reliance on Thai manufacturing sites periodically raises concentration questions when the region faces flooding or political disruption, as it did in the 2011 floods that crippled the industry.