The short version
Seagate (STX) reported after the close on Tuesday. Demand is outstripping supply, customer commitments run to 2030, and free cash flow hit a record.
The shares fell in after-hours trading anyway.
Context for why: Seagate is up roughly 298% this year. When a stock has tripled, excellent results are the minimum.
The boom is real. Western Digital (WDC) has sold out its hard-drive production capacity, with cloud customers accounting for $3.9 billion, or about 88%, of its revenue last quarter. AI data centres need somewhere to put the data they generate, and that somewhere is hard drives.
And the threat is real too. Toshiba plans to invest about $380 million doubling hard-drive capacity in the Philippines, targeting 30% market share. That news knocked both stocks in early October, and Seagate fell 31% in a month.
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Why hard drives suddenly matter
Every AI workload creates data, and that data has to be stored somewhere cheap.
That somewhere is still the spinning hard drive. Flash memory is faster, but for the enormous volumes AI generates, hard drives remain the cost-efficient option. Western Digital's chief executive has described it plainly: virtually every AI workload, from training to inference, creates data stored persistently and cost-efficiently on hard drives.
What that demand has done to these businesses:
- 🏭 Western Digital has sold out its production capacity, with long-term agreements extending years ahead.
- ☁️ Cloud customers were $3.9 billion of WD's revenue last quarter, about 88% of the total. This used to be a consumer products company.
- 📅 Seagate says customer commitments now run to 2030, with supply contracted through 2028.
- 💰 Seagate's fiscal 2026 revenue rose 34% to $12.2 billion, with most high-capacity drive supply already allocated.
And prices have moved sharply. How much depends on which price you look at, so here are several, each sourced:
- 🛒 Retail: price tracking reported by Tom's Hardware found hard drives about 51% more expensive in February 2026 than five months earlier.
- 🏭 The manufacturer's own number: Western Digital told investors in August that its price per terabyte rose by a "high teens" percentage year on year in the June quarter, up from high single digits in the previous quarter.
- 📊 Spot market: a Rosenblatt Securities analyst put the spot premium at 30-40% in an August note.
- 🌏 Wholesale: Nikkei data showed bulk 1TB drives up 15% quarter on quarter in July-September, a sixth consecutive quarterly rise.
If you have bought an external drive recently and winced, that is why.
And the imbalance has a forecast attached. Morgan Stanley has estimated hard-drive demand growing 40-50% a year against supply growth of 30-35%, with the shortage persisting through at least 2028. That is a bank's model, not a certainty, but it explains why customers are signing contracts years ahead.
The company that used to own SanDisk
Western Digital and SanDisk were the same company until February 2025.
The split left Western Digital as a pure hard-drive business and SanDisk as the flash memory business. Both have since ridden the same AI storage wave from opposite sides of it, and SanDisk's own numbers show how extreme that wave has been: revenue up 175% on mid-teens volume growth, meaning almost all of it was price.
That comparison is the useful one. When a shortage lifts prices across an industry, the question is never whether this year's numbers look good. It is what happens when the shortage ends.
So why did the stock fall?
Because it had already tripled.
Seagate is up roughly 298% this year. At that level, the market is not asking whether results are good. It is asking whether they are good enough to justify a price that already assumes years of shortage.
Three things investors are weighing against the good news:
- 🏭 Toshiba is adding capacity. A reported $380 million investment to double hard-drive production in the Philippines, targeting 30% market share. That announcement alone knocked both stocks in early October, and Seagate fell 31% in a month before these results.
- 💲 Pricing is the question nobody can answer yet. On the earnings call, a Morgan Stanley analyst went straight to pricing. Shortage pricing is wonderful while it lasts and impossible to extend indefinitely.
- ⏳ Contracted supply cuts both ways. Locking customers in to 2030 secures volume, and it also fixes prices while the market is tight. If scarcity persists, those contracts look generous to the customer.
Several brokers called the earlier selloff overdone, with Morgan Stanley, Citi and Rosenblatt among them arguing the storage shortage is not closing soon. Those are opinions, and the market has not fully agreed with them.
You have now seen this six times
Good news, falling share price. It keeps happening because the share price already contained the good news.
- 📺 Netflix grew profit 49% and fell
- ✈️ Boeing won a six-year certification and moved half a percent
- 🎧 Spotify missed on earnings and rose 7%
- 🧬 A cancer vaccine hit its target and Moderna fell 18%, while a psoriasis drug hit its target and Oruka rose 12%
- 💾 And now Seagate, which cannot make drives fast enough, falling on results.
The question to ask before any dated event: not "will this be good?" but "what is already assumed?" If you cannot answer the second, the first will not help you.
What could go wrong
- 🔄 Storage is a cycle, and cycles turn. Hard drives and memory have a long history of shortage, then capacity expansion, then oversupply and collapsing prices. Toshiba adding capacity is exactly how previous cycles ended.
- 📈 Both stocks have run enormously. Seagate up roughly 298% this year, Western Digital up sharply too. Expectations at that level leave little room for anything less than excellent.
- 🔒 Long contracts fix prices as well as volumes. Securing customers to 2028 or 2030 removes uncertainty and removes upside if scarcity continues.
- 🏢 Customer concentration is extreme. When 88% of revenue comes from cloud customers, a pause in hyperscaler spending reaches these companies directly.
- 📉 The shares move violently on supply news. A single Toshiba announcement took about a third off Seagate in a month. That volatility is a feature of the sector, not an exception.
STX and WDC are examples to research, not recommendations.
What should investors take from this?
Shortage pricing is a condition, not a business model.
When an industry cannot meet demand, revenue and margins both rise, and the numbers look extraordinary. The useful question is what the business looks like when supply catches up, because it always eventually does.
Three habits:
- 🔍 Separate volume growth from price growth, as we did with SanDisk's 175% revenue rise on mid-teens volume growth. Price-led booms reverse.
- 📅 Watch capacity announcements, not just earnings. Competitors adding factories is the clearest early signal that a shortage has a deadline.
- ⚡ Map the whole physical layer. AI runs through power and grid equipment, memory, storage and cooling. Each layer has its own cycle, and they do not all turn at once.
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FAQs
Why are hard drive prices rising?
AI data centres are consuming hard-drive capacity faster than manufacturers can produce it. Enterprise drive prices have reportedly risen 40-60% in recent months, with consumer prices rising too. Western Digital has sold out its production capacity and Seagate says customer commitments now run to 2030.
Why did Seagate's stock fall on good results?
The shares are up roughly 298% this year, so strong results were already expected. Investors are also weighing Toshiba's planned capacity expansion and the question of how long shortage pricing can last.
What is Toshiba doing?
Toshiba is reported to be investing about $380 million to double hard-drive manufacturing capacity in the Philippines, targeting around 30% market share. The news knocked Seagate and Western Digital shares in early October, though several brokers called that selloff overdone.
Are Western Digital and SanDisk the same company?
Not any more. They separated in February 2025, leaving Western Digital as a pure hard-drive business and SanDisk as the flash memory business. Both are now listed separately.
Can I invest in these companies from the UAE?
Seagate (STX) and Western Digital (WDC) both trade on US exchanges. On Nemo.money you can research and invest in eligible US-listed stocks and ETFs from $1 with zero commission, with uninvested cash earning 6% AER interest, paid daily in USD. Both are examples to research, not recommendations, and storage is a highly cyclical sector. Your capital is at risk.
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