Key Highlights

  • Record margins: Seagate reported record margins and robust results in fiscal 2026, helped by new HAMR technology that packs more data per drive.
  • Booked capacity: Nearline drive capacity used in data centers was effectively booked well into the future, prompting raised growth targets.
  • Concentrated industry: Seagate and one rival together Supply most of the hard-drive market, an unusually consolidated structure that supports pricing discipline.
  • AI-driven revival: Training and running AI systems generates enormous quantities of data that must be stored affordably, reviving Demand for hard drives.

Hard disk drives were supposed to be a dying technology, gradually replaced by faster flash memory. Instead, the artificial-intelligence boom has given them a new Lease of life, because the sheer Volume of data being created needs somewhere cheap to live. That surprising twist makes Seagate (NASDAQ:STX), one of the last two big drive makers, unexpectedly relevant to the Nasdaq 100 AI debate.

What Seagate Does

Seagate is one of the world's largest manufacturers of hard disk drives, the spinning-platter storage devices that hold vast amounts of data at low cost. It sits in the technology sector. While flash memory is faster, hard drives remain far cheaper for storing large quantities of information that does not need instant access, so they dominate the mass storage used by cloud data centres. Seagate and one rival together supply most of the market, an unusually concentrated industry structure.

AI Feeds Demand for Capacity

The AI era has proved a boon. Training and running AI systems generates enormous quantities of data, much of which must be stored affordably, and that has driven strong demand for the high-capacity "nearline" drives used in data centres. Through its 2026 financial year Seagate reported record margins and robust results, helped by its new HAMR technology, which packs more data onto each drive, and it noted that its nearline capacity was effectively booked well into the future, prompting it to raise its growth targets. Because Seagate operates in a concentrated market with disciplined supply, the surge in demand has translated into unusually strong pricing and profitability.

Why it Matters for the Nasdaq 100

Seagate offers the index exposure to a specific and often overlooked corner of the AI build-out: mass storage. Its results reveal whether the data being generated by AI is translating into durable demand for capacity, providing a useful cross-check on the wider story. As a member of the benchmark in a rare, consolidated industry with improving economics, it also illustrates how a technology once written off can be revived by a new source of demand.

The Risks to Weigh

Storage is cyclical, and that is the central risk: demand can soften and pricing can weaken if cloud customers pause spending or if supply catches up. Seagate's fortunes are tied to a handful of large data-centre buyers, so their Investment decisions matter enormously. The long-term threat from flash memory has not vanished, and any acceleration in its cost declines could erode the advantage of hard drives. Executing the transition to new technology such as HAMR carries risk, and the shares can be volatile.

A Two-horse Race

The structure of the hard-drive industry is central to Seagate's appeal. Only two companies of scale remain, having consolidated over many years, and both have learned the painful lessons of past price wars. That discipline means neither rushes to flood the market with capacity, so when demand surges, as it has with AI, prices and margins can rise in a way that would be impossible in a fragmented industry. For investors, this consolidated structure is what has turned a once-commoditised Business into a far more profitable one, though it also means the two players' behaviour, rather than technology alone, will determine how long the good times last.

What to Watch Next

Readers should track demand for high-capacity nearline drives and any commentary on how far future capacity is booked, since these reveal the strength of data-centre demand. Pricing and gross margins show whether the disciplined market is holding. Progress with HAMR technology indicates whether Seagate can keep increasing capacity per drive, the key to staying competitive with flash on cost. Commentary from large cloud customers about their storage plans is a useful signal. Finally, watch industry supply and demand, because pricing depends on the two makers adding capacity.

An Old Technology Finds New Relevance

Seagate's revival illustrates how a technology written off as obsolete can find new relevance when demand shifts unexpectedly in its favor. Whether that revival proves durable depends less on Seagate alone than on the discipline of an industry with only two major players, both of whom have learned, at some cost, what happens when that discipline breaks down.