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In Windows Task Manager - what is AppleMobileDevice, system user? It is running 55% or more and makes the cpu usage at 55-100%

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Me too, using 100% of one CPU. Just worked out why the fans were crazy. –  Colonel Panic Sep 30 '12 at 22:30
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I found an Apple discussion thread about this issue:

https://discussions.apple.com/thread/3233271?start=0&tstart=0

The thread suggests that the problem was introduced by an iTunes update. The suggested fix is uninstalling and reinstalling iTunes, following a specific set of steps. Here's the link from Apple with the uninstallation/reinstallation steps:

http://support.apple.com/kb/HT1925?viewlocale=en_US

I do not have Windows, and I have not verified the problem or the solution.

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