Intel Corp. (INTC) warned its fourth-quarter revenue will fall about $1 billion short of its previous guidance as shortages of hard-disk drives are expected to hurt its core personal computer market for the next few months.

The worst flooding in decades in Thailand dismantled or damaged a large chunk of the world's hard-drive manufacturing operations, causing a slowdown in PC production and the need for fewer chips by computer makers, Intel said. The Santa Clara, Calif., company had said it didn't expect an impact in the current period from the flooding.

"We do expect continued shortage of [hard-disk drives] to be pretty significant in the early part of 2012," Intel Chief Financial Officer Stacy Smith said. "And we expect supply to catch up to overall demand sometime in the first half of 2012. Where exactly that happens over the course of the first half is too early to say, but we do expect that this will catch up sometime in the first half."

The slowdown in computer production comes as the rise of tablets weighs on demand for PCs, and as concerns grow about the global economy because of Europe's problems and the perception of slowing growth in China.

Intel said Monday it now expects fourth-quarter revenue of $13.7 billion, plus or minus $300 million, down from the previous view of $14.7 billion, plus or minus $500 million. Intel also lowered its fourth-quarter gross margin view to 64.5%, plus or minus a couple of percentage points, versus 65%, plus or minus a couple of percentage points.

The news sent Intel shares down 5% to $23.76 in recent trading, trimming some of the stock's gains from the past few months. Despite the slide, the stock has climbed 8.2% over the past 12 months. PC chip rival Advanced Micro Devices Inc. (AMD) also traded lower, off 4.9% to $5.27, while computer graphics chip maker Nvidia Corp. (NVDA) slid 4.1% to $14.29. Memory chip maker Micron Technology Inc. (MU) lost 3.5% to $5.68.

Demand for servers and PCs remains "healthy and growing," with the guidance cut related to the supply issues, Smith said. He noted that PC sales have played out as Intel had expected at the beginning of the fourth quarter.

Intel said in October that demand would be below normal seasonality, with consumer spending in mature markets remaining weak but business spending and emerging markets demand staying strong.

Intel on Monday said that it expects sales of personal computers to be up sequentially in the fourth quarter, despite the flooding and PC makers buying fewer chips. The company expects hard-disk drive supply shortages to continue into the first quarter, followed by a rebuilding of microprocessor inventories as supplies of hard-disk drives recover during the first half.

"The hard-disk drive situation is going to be a little more pervasive than people think through the first half of next year," Raymond James analyst Hans Mosesmann said. "This shouldn't be too surprising, but for the next six months, we'll be in limbo."

The warning is a sharp reversal for Intel, which has been blowing away estimates in recent quarters, helped by its server chips. The company also has held a more optimistic view of the PC industry because of strength in so-called "white-box" desktops in emerging markets.

"White-box" PCs are either self-built or made by small computer shops, as opposed to PCs produced by Hewlett-Packard Co. (HPQ), Dell Inc. (DELL) and other computer giants. Intel Chief Executive Paul Otellini said earlier this year that about a third of all PCs sold in emerging markets aren't branded machines.

While many analysts expect white-box desktop manufacturers to be hurt the most by the hard-disk drive shortage, Tom Kilroy, Intel senior vice president and general manager of sales and marketing, said Monday that the hard-drive shortages are "quite broad across customer segments and geographies."

Smith, meanwhile, said the average selling price for chips should be higher in the period as low-end PCs, which have the least expensive chips, take the biggest hit from the hard-disk drive shortages. He added that solid-state drives, which use flash memory, should see an increase in demand.

Orders dropped off quickly in the past couple weeks as hard-disk drive makers provided updates to customers on how much supply they would receive, he said.

"As our customers have seen a customer-by-customer commitment of supply of hard-disk drives, they started to align their backlog to future [hard-disk drive] supply and so we saw pretty rapid reduction of backlog over the last few weeks," Smith said.

Intel isn't cutting back on its own production, he said, but will keep building chips on expectations that orders will rebound in the first half of 2012.

IHS iSuppli earlier this month said the Thailand flooding will spur a shortfall of PCs in the first quarter and cause global computer shipments to rise only 6.8% in 2012, down from its previous outlook for 9.5% growth.

Many tech companies--including hard drive maker Western Digital Corp. (WDC) and component supplier Hutchinson Technology Inc. (HTCH)--had suspended operations in Thailand as rising water flooded their facilities. About 40% of the hard-disk drive industry's total output originates in the country, something that is leading to supply shortages and hurting customers such as computer makers.

Last week, Texas Instruments Inc. (TXN) and Altera Corp. (ALTR) cut their guidance for the fourth quarter as worries about the broader economy led to weaker demand across most of the chip makers' end markets.

-By Shara Tibken, Dow Jones Newswires; 212-416-2189; shara.tibken@dowjones.com

--Lauren Pollock contributed to this article.

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