Thailand's Flood Wrecked the Hard Disk Drive Industry: The Biggest Factory Fell, the Number Two Took the Throne
One flood in Thailand rewrote the hard drive rankings: the biggest player, Western Digital, saw shipments fall 51% quarter-over-quarter, while Seagate fell only 8% and overtook it to take the top spot.
The argument · tap a timestamp to hear it
Flood walls gave hard drive makers a false sense of security
The industrial estates were built on river floodplain converted from rice paddies north of Bangkok. For flood protection, developers installed ring levees up to two meters high, secondary wave walls, pumps and drainage systems; the parks quickly grew into small cities with their own housing and shops. But this engineering may have misled everyone. When the real flood season arrived in 2011, seven industrial parks were inundated within two weeks. Research later suspected that precisely this kind of seemingly complete infrastructure created a false confidence — the belief that even if it rained, everything would be fine. In other words, what manufacturers bought was not safety, but an illusion about risk.
Reservoir releases weren't the culprit — local rainfall was
After the flood, dam managers were blamed for releasing water too late, with criticism centering on favoritism toward farmers and rice-corruption allegations. But the research does not support this attribution. A 2023 simulation ran 17 scenarios swapping the release strategies of two dams, concluding that even with perfect foresight of subsequent rainfall, the flooded area could have been reduced by at most only 3.68%. Another 2020 study examined hydrological station data along the Chao Phraya River and found that in one low-lying disaster area, less than 30% of the floodwater came from the river, while 73.7% came from local rainfall. In other words, the water mainly fell directly on the disaster zone — reservoir decisions cannot carry the blame.
Why did Seagate, which wasn't flooded, also stop?
Seagate's factory in northern Korat was basically fine, but production still halted — because seven of its top ten suppliers were underwater. The typical case was Japan's Nidec, which makes spindle motors for hard drives and shut down directly after two plants flooded. The hard drive supply chain is interlocking layer by layer: no matter how safe the assembly line, if the motors don't come, the whole line stops. Seagate managed to hold its quarterly shipment decline to 8% by quickly qualifying new suppliers, modifying designs to reduce complexity, and negotiating payment terms with suppliers. In the same year, Western Digital's core plant took on water 1.8 meters deep, and quarterly shipments fell 51%. The difference between the two was not whose building was taller, but whose underlying supply chain could route around the break point faster.
Zero inventory amplified the flood into a global shortage
Before the flood hit, the hard drive industry had just completed a round of consolidation: Western Digital announced in March 2011 it would acquire Hitachi's hard drive business, and a month later Seagate announced it would acquire Samsung, barely bringing supply and demand back into balance. Precisely because there was no surplus inventory to draw down, the shock was multiplied. Tom Coughlin estimated that Q4 2011 hard drive demand was about 180 million units, while actual production was only 110 to 120 million; and the flood happened to hit right in the Christmas shopping season. Retail immediately raised spot prices by 20% to 40%, and a 1TB drive at Taipei's Guanghua Market went from NT$1,750 to over NT$3,000. Even Intel admitted in December that Q4 revenue would be about $1 billion short of expectations due to the hard drive shortage. A localized flood, transmitted through zero inventory, became a global shortage just like that.
The water receded, but hard drive prices didn't fall for two years
The water receded, but the shortage did not end quickly. Hard drive supply availability only returned to pre-disaster levels about nine months later; retail prices fell back even more slowly — hard drive prices on Newegg did not drop back to pre-disaster levels until April 2013. Backblaze did the math using its own purchasing records: in September 2011 the cost per GB was $0.044, and it would take until September 2013 to return to that level again. Why is it easy to raise prices but hard to lower them? The author lists several interpretations: the ecosystem recovered more slowly than expected, the two giants' 2011 acquisitions brought extra costs, tablets caused PC hard drive demand to permanently decline, and a more cynical guess — after Seagate and Western Digital acquired their second-tier rivals, only three major players remained in the entire industry, making prices easier to ‘stabilize’, or in his own word: cartelize. As for which one is the truth, he does not conclude.
The flooded giant chose to stay and keep building walls
Western Digital's post-disaster choice is telling: it did not retreat, but doubled down on defenses. WD and the Bang Pa-in estate owner built an 11-kilometer flood wall along the estate, and WD added a 6-meter-high inner wall around the factory; to add redundancy to its supply chain, it announced in December 2011 that it would build a new slider fab in Malaysia. A survey of 50 directly affected Japanese companies showed that nearly 80% decided to stay in Thailand. The reasons are not hard to understand: ready-made estates, supporting infrastructure and skilled workers are hard to pack up and take away. Thailand has since suffered multiple rounds of major flooding, especially in the 2020s when it happened almost every year; in November of the most recent year it even rained what was billed as a ‘once-in-300-years’ storm, but these estates have held out so far. Whether stronger defenses will be needed in the future can only be tested by the next major flood.
In their own words · checked verbatim
Unfortunately, those failed to prevent significant flood damage in 2011. And perhaps the presence of such infrastructure caused a sort of false confidence that when the rains come, things will be alright.
But research has since found that the decision was a bit of a false choice. It wouldn’t have mattered in the end.
No sliders, no hard drives.
There was no excess inventory to work off.
Availability did not return to pre-flood levels until about nine months afterwards. Curiously, prices did not come back down as fast.
But one thing they did not do was leave.
Figures
| Thailand's share of global hard drive production capacity | about 40% | 4:05 |
| 2011 Thailand rainy season rainfall | over 1.4 meters, 143% of the normal rainy season | 8:24 |
| Flooded industrial parks / affected companies | 7 parks, 804 companies | 9:25 |
| Flood depth at Western Digital's Thailand factory | 1.8 meters | 10:27 |
| Taipei 1TB hard drive price increase | NT$1,750 → NT$3,000+ | 13:36 |
| Q4 shipment change quarter-over-quarter | Western Digital -51%, Seagate -8%; market share Seagate 38% / Western Digital 23% | 14:36 |
| Total economic losses from the Thailand flood | $46 billion | 18:47 |
Glossary
- industrial estate
- A large industrial zone developed by the government with water, power and road infrastructure, often growing into a small city with its own housing and commerce.
- slider
- A ceramic aerodynamic component that connects the read/write head and keeps the head from touching the disk platter; without it a hard drive cannot work.
- La Niña
- A climate phenomenon of abnormally cool sea surface temperatures in the eastern equatorial Pacific, which often brings above-average rainfall to Southeast Asia.
- cartelize
- A few manufacturers forming a tacit understanding to maintain high profits by controlling output and prices.
How to listen
Production decision-makers preparing to build or already building factories in Southeast Asia, investors watching the hard drive and storage industry landscape, and engineers doing supply chain risk management.
The opening history of Thailand's rivers and dam-building can be skipped; start at the 3-minute mark with why the hard drive industry moved to Thailand.