Hard drive capacity from one of the world’s largest manufacturers is starting to run dry.
Western Digital chief executive Irving Tan said the company’s output for this year is effectively booked out.
The AI supercycle has already scrambled DRAM and NAND supply chains, and now plain old HDDs are getting dragged into the same mess.
Speaking on the Q2 earnings call, Tan said Western Digital has been steering product development toward enterprise customers because that is where the money and volume commitments are.
With hyperscalers piling into data centre buildouts, demand for bulk storage is unlikely to ease.
Tan said: “Yeah, thanks, Erik. As we highlighted, we’re pretty much sold out for calendar 2026. We have firm POs with our top seven customers. We’ve established LTAs with two of them for calendar 2027 and with one for calendar 2028. Obviously, these LTAs have a combination of volume of exabytes and price.”
If you want a blunt indicator of where Western Digital is focusing, its investor relations team says cloud revenue accounts for 89 per cent of total revenue.
Consumer revenue sits at just five per cent, which is what happens when enterprise buyers turn up with long-term agreements, and everyone else turns up with vibes.
When the gap is that wide, it is no surprise that Western Digital is pivoting more aggressively toward enterprise demand and leaving the client segment to queue outside.
The driver is the massive data centre buildout underway globally, with demand particularly strong in US-based facilities.
AI systems do not run on magic; they run on obscene amounts of data, and someone has to store all that scraped web content, processed datasets and backups.
Cloud service providers still rely on HDDs for much of that, because, per terabyte, they remain the most cost-effective and efficient way to store vast amounts of data.
At the data centre scale, storage is measured in exabytes, which is why Western Digital is signing agreements priced by exabytes and delivery windows.
The result is the usual knock-on effect, with suppliers under pressure and everyone downstream trying to guess what they will actually be able to buy this quarter.
We have already seen core PC components drift into short supply as AI consumes capacity, and HDDs joining the party suggests the hangover is not coming soon.
