updated 4/19/2011 5:56:37 PM ET 2011-04-19T21:56:37

Calling them "one of the most disruptive forces in computing" in nearly 30 years, Goldman Sachs says tablets are eating into the traditional PC market and will reshuffle who profits in an industry currently dominated by Microsoft and Intel.

"Significantly, most tablets are not utilizing Intel microprocessors or a Microsoft operating system, and this allows new companies such as Apple and Google to encroach on" those companies, says the report, which was prepared by 19 Goldman analysts around the world.

With people buying tablets instead of laptops and other computers, Goldman estimates that tablets will cannibalize about 35 percent of the PC market in 2011 and 33 percent in 2012.

"This should result in a theoretical loss of 21 million notebooks in 2011 and 26.5 million in 2012," the report says. But while some tablet units will be replacing computers, the other 65 percent to 67 percent will be purchased in addition to PCs and therefore will increase the overall PC market.

The report also says iPad maker Apple Inc. will hold a 64 percent share of the tablet market this year. The analysts estimate that 60.1 million tablets will be sold in 2011. That's up from 17.9 million in 2010, when the iPad was first introduced.

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