Whilst it solves the problem, he said, it can cause problems for computer users.

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This will lead to shortages and higher prices for hard disk drives and will cause problems for computer, consumer and enterprise storage customers well into 2012.

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Digital output helps protect against radio and electromagnetic interference, which can cause audio problems with microphones mounted on computer displays.

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One cause is botched computer systems and underwriting, especially at Oxford, which has led to problems with billing and premiums.

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