Western Digital Delivers New Innovations to Drive Open Standard Interfaces and RISC-V Processor Development

Company Announces Plans to Open Source New RISC-V SweRV Core™ to Accelerate Development of Purpose-Built Architectures from Core to Edge

Western Digital Corp. (NASDAQ: WDC) today announced at the RISC-V Summit three new open-source innovations designed to support Western Digital's internal RISC-V development efforts and those of the growing RISC-V ecosystem. In his keynote address, Western Digital's Chief Technology Officer Martin Fink unveiled plans to release a new open source RISC-V core, an open standard initiative for cache coherent memory over a network and an open source RISC-V instruction set simulator. These innovations are expected to accelerate development of new open, purpose-built compute architectures for Big Data and Fast Data environments. Western Digital has taken an active role in helping to advance the RISC-V ecosystem, including multiple related strategic investments and partnerships, and demonstrated progress toward its stated goal of transitioning one billion of the company's processor cores to the RISC-V architecture.

"As Big Data and Fast Data continues to proliferate, purpose-built technologies are essential for unlocking the true value of data across today's wide-ranging data-centric applications," said Fink. "Our SweRV Core and the new cache coherency fabric initiative demonstrate the significant possibilities that can be realized by bringing data closer to processing power. These planned contributions to the open-source community and continued commitment of the RISC-V initiative offer exciting potential to accelerate collaborative innovation and data-driven discoveries."

RISC-V is an open, scalable instruction set architecture that enables the diversity of Big Data and Fast Data applications and workloads proliferating in core data centers and in remote and mobile systems at the edge. It provides an alternative to current, standard, general purpose compute architectures. With RISC-V, open standard interfaces can be utilized to enable specialty processing, memory centric solutions, unique storage and flexible interconnect applications.

Western Digital is planning to open source its new RISC-V SweRV Core, which has a 2-way superscalar design. Western Digital's RISC-V SweRV Core is a 32-bit, 9 stage pipeline core that allows several instructions to be loaded at once and execute simultaneously, shortening the time taken to run programs. It is a compact, in-order core and runs at 4.9 CoreMarks/Mhz¹. Its power-efficient design offers clock speeds of up to 1.8Ghz¹ on a 28mm CMOS process technology. The company plans to use the SweRV Core in various internal embedded designs, including flash controllers and SSDs. Open sourcing the core is expected to drive development of new data-centric applications such as Internet of Things (IoT), secure processing, industrial controls and more.

Western Digital's OmniXtend™ is a new open approach to providing cache coherent memory over an Ethernet fabric. This memory-centric system architecture provides open standard interfaces for access and data sharing across processors, machine learning accelerators, GPUs, FPGAs and other components. It is an open solution for efficiently attaching persistent memory to processors and offers potential support of future advanced fabrics that connect compute, storage, memory and I/O components.

Western Digital also introduced today its open-sourced SweRV Instruction Set Simulator (ISS)™, which offers full test bench support for use with RISC-V cores. An ISS is a computer program that simulates the execution of instructions of a processor. It allows external events to be modeled, such as interrupts and bus errors, and assures the RISC-V core is functioning properly. The company utilized the SweRV ISS to rigorously simulate and validate the SweRV Core, with more than 10 billion instructions executed. Western Digital expects both the SweRV Core and SweRV ISS will help to accelerate the industry's move to an open source instruction set architecture.

"Speeds, feeds, and brute compute is no longer the winning formula for edge and endpoint computing. As more data moves to the edge for real-time processing and inferencing, configurable architectures will be better suited to meet the needs of heavy and often dynamic application workloads, especially for those driven by artificial intelligence and Internet of Things," said Mario Morales, program vice president, enabling technologies and semiconductors, IDC. "Power efficiency, configurability, and low power will become the key metrics for edge and endpoint computing architectures."

Availability and Resources

Western Digital's SweRV ISS and OmniXtend architecture are available now for download at the following locations:

• OmniXtend: https://github.com/westerndigitalcorporation/omnixtend

• SweRV ISS: https://github.com/westerndigitalcorporation/swerv-ISS

Western Digital's SweRV core will be available in CY Q1 2019. For further information visit https://www.westerndigital.com/company/innovations#risc-v.

About Western Digital

Western Digital creates environments for data to thrive. The company is driving the innovation needed to help customers capture, preserve, access and transform an ever-increasing diversity of data. Everywhere data lives, from advanced data centers to mobile sensors to personal devices, our industry-leading solutions deliver the possibilities of data. Western Digital® data-centric solutions are marketed under the G-Technology™, HGST™, SanDisk®, Tegile™, Upthere™, and WD® brands.

1- Estimated performance based on internal testing.

Forward-Looking Statements

This news release contains forward-looking statements that involve risks and uncertainties, including, but not limited to, statements regarding RISC-V and our investments in and contributions to the RISC-V ecosystem, our market positioning, business strategies and growth opportunities, market trends, and data growth and its drivers. Forward-looking statements should not be read as a guarantee of future performance or results, and will not necessarily be accurate indications of the times at, or by, which such performance or results will be achieved, if at all. Forward-looking statements are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements.

Key risks and uncertainties include volatility in global economic conditions; business conditions and growth in the storage ecosystem; impact of competitive products and pricing; actions by competitors; unexpected advances in competing technologies; our development and introduction of products based on new technologies and expansion into new data storage markets; difficulties or delays in manufacturing; and other risks and uncertainties listed in the company's filings with the Securities and Exchange Commission (the "SEC") and available on the SEC's website at www.sec.gov, including our most recently filed periodic report, to which your attention is directed. We do not undertake any obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future developments or otherwise, except as required by law.

© 2018 Western Digital Corporation or its affiliates. All rights reserved. Western Digital, the Western Digital logo, G-Technology, SanDisk, Tegile, Upthere, WD, SweRV Core, SweRV ISS, and OmniXtend are registered trademarks or trademarks of Western Digital Corporation or its affiliates in the US and/or other countries. All other marks are the property of their respective owners.

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