Dave Mosley and the art of making room

When Dave Mosley introduced himself on an innovation panel in Northern Ireland, he offered a peculiar definition of a newcomer. He had been at Seagate for 27 years, he said, but was still a rookie beside some of his colleagues. In an industry fond of announcing that everything has changed since breakfast, it was a pleasingly unfashionable way to establish his credentials.

He had a second way to measure time. The disk drives he worked on when he joined held one gigabyte. By the time of that panel, Seagate was shipping 30-terabyte drives. The product had acquired 30,000 times the capacity. The person describing it had acquired enough experience to know that neither accomplishment belonged to one person.

Mosley’s career has unfolded inside that widening space. He arrived as a senior engineer in 1996, became chief executive in October 2017, and added the board chairmanship in October 2025. The constant has been an unusually literal question: where will everyone put everything? Artificial intelligence has supplied fresh urgency. Mosley has been working on the cupboard for decades.

A physicist learns the rest of the business

Before Seagate, there was physics. Mosley earned his doctorate at the University of California, Davis, with a focus on solid-state physics. His earlier career included research at Lawrence Livermore National Laboratory and engineering jobs at Micropolis and Conner Peripherals. The route into corporate leadership began with the behavior of materials, a useful education for a business whose promises must eventually survive contact with matter.

At Seagate he moved through research and development, global sales and marketing, and operations. Those functions ask different questions of the same object. An engineer wants to know whether it works. A factory needs to make it repeatedly. A customer wants delivery, reliability, and a price that leaves room for the rest of the budget. Mosley accumulated responsibility across all three conversations.

In January 2016, Seagate put its Global Markets & Customers organization under him while he was president of operations and technology. Steve Luczo, then chairman and CEO, described an effort to extend operating efficiency into the company’s market-facing work. The organizational decision was revealing: the person responsible for making the product would also oversee the people explaining and selling it.

When the board announced the CEO succession in July 2017, Mosley was president and chief operating officer. Luczo would become executive chairman; Mosley would take over on October 1. The handover had been prepared inside the company. His appointment brought a long-serving operator to the top of a business where a new strategy still has to travel through a factory.

The cloud has a factory floor

The Northern Ireland appearance offered a view of how Mosley thinks about that journey. He described Seagate’s Derry operation progressing through successive changes in recording technology. A manufacturing site had become a place doing increasingly sophisticated work. In his telling, the history of a location and the history of a product were inseparable.

He also spoke about the time involved: a wafer could spend seven to nine months moving through the fabrication process. That interval is a useful corrective to the language of instant digital transformation. Long before a file becomes available at a click, somebody has committed equipment, expertise, and months of work to the component that will help hold it.

His public updates supply smaller glimpses of the same geography. In 2019 he visited the Shakopee office in Minnesota and joked that even the polar vortex had failed to stop the team’s work on storage. There is no need to turn a cold business trip into a legend. Its appeal is its ordinariness: innovation sometimes involves going to Minnesota in the wrong season.

That background also gives context to the AI conversation. Mosley has lived through several reasons for people to buy storage. The application changes, the customer changes, and the physical work continues. A technology company can advertise the future in an afternoon. Producing the parts takes longer.

A laser, a platter, and a long wait

The technical wager associated with Mosley’s tenure is heat-assisted magnetic recording, or HAMR. The name is admirably literal. To store more data, engineers make the recorded bits smaller. Keeping those smaller bits stable requires a material that is harder to magnetize. A tiny, precisely applied spot of heat helps the writer record data on that material.

Seagate introduced its Mozaic 3+ platform in January 2024, combining the recording method with changes to the media, writer, reader, and controller. The company described an iron-platinum structure for the media and a laser within the writing system. This was a coordinated engineering problem. Smaller writing needed a reader capable of retrieving what had been written.

For Mosley, the difficult part included turning the technical achievement into something customers would accept. In December 2024, Seagate disclosed that HAMR-based Mozaic drives had completed qualification with several customers, including a leading cloud provider. The distinction between a launch and qualification matters: a buyer planning to entrust data to fleets of drives needs more than an attractive demonstration.

The same disclosure carried a less glamorous detail. Bringing existing production equipment back online had taken longer than expected, constraining the anticipated output. It was a reminder that product introductions and industrial execution have separate clocks. The physicist in the chief executive’s chair had to answer for both.

By January 2025, Mosley was reporting that the company had begun ramping Mozaic products to its lead cloud customer in the December quarter. In March 2026, Seagate announced Mozaic 4+ in production with two leading hyperscale cloud providers, at capacities up to 44 terabytes. The progression is best understood as a series of permissions earned: make it, test it, qualify it, then make it in quantity.

The years between the announcements

The progress came through an uncomfortable period. In October 2023, Mosley described a longer-than-typical downturn while Seagate reported quarterly revenue of $1.45 billion and a GAAP net loss of $184 million. His priorities included financial discipline, positive free cash flow, and continued work on the HAMR roadmap. The attractive future had to be financed during an unattractive present.

That tension belongs in his story because perseverance becomes much easier to praise after the demand returns. A storage manufacturer must decide what to keep developing before it knows exactly when customers will buy again. Mosley’s public explanation connected near-term restraint with the attempt to improve what the company could eventually offer.

The financial picture looked different by July 2026. Seagate reported $12.195 billion in annual revenue for its fiscal year ended July 3, compared with $9.097 billion a year earlier. It also reported $3.1 billion in annual free cash flow. Those are company results, produced by a large organization. They nevertheless show the scale of the business Mosley was steering as cloud demand strengthened.

His responsibilities had widened in the meantime. He joined the Cirrus Logic board in 2024. In 2025, Seagate’s board chose him to succeed Michael Cannon as chair, with Cannon moving into the lead independent director role. Engineering experience had become relevant well beyond the engineering department.

What is worth keeping?

Mosley’s public interests extend beyond how many bits will fit on a disk. In 2019, he drew attention to Seagate’s work with CyArk on a virtual model of Mumbai’s Gateway of India. The project supported preservation and research into changes affecting the monument. Here was a straightforward answer to why anyone should care about storage: a record can help people notice what time is doing.

In 2020, he announced the opening of the Lyve Labs innovation center in Tel Aviv, emphasizing partnerships with startups, enterprises, and other innovators tackling data problems. The emphasis on collaboration appears again in his later discussions of data strategy. His own route across company functions makes that a particularly coherent position.

At the Six Five Summit in August 2026, he discussed data decisions as work that crosses organizational boundaries. What should be kept? What should be discarded? Who can use it, and how readily? These questions reach into finance and business operations as well as IT. Buying capacity answers only part of them.

The idea has a pleasing complication for the person selling the capacity. Keeping everything creates its own cost and management problems. Discarding something closes off possible future uses. Mosley’s argument asks businesses to think deliberately about that trade-off, and to make their data infrastructure part of planning rather than a bill discovered afterwards.

“Tech is a little cooler now.”

Dave Mosley · April 2026

Still making room

Onstage at Semafor World Economy in April 2026, Mosley sounded entertained by the renewed excitement around his field. “Tech is a little cooler now,” he said. It is an appealing verdict from somebody whose work involves heating a microscopic patch of disk so that the rest of us can keep more things.

His ambition remains connected to density, access, and the economics of retaining data. The longer-range roadmap points toward 10 terabytes per disk and drives of up to 100 terabytes. Those are development goals. The work between a roadmap and a customer’s installation is precisely the work his career has taught him to take seriously.

There is a quiet consistency to the engineer, the traveling operations leader, and the executive talking about AI. Each is concerned with what can be made dependable enough to use. The audience may prefer the next application. Mosley keeps returning to what must sit underneath it, waiting for the moment somebody needs an old file again.