Have you purchased an iMac with a 1TB hard disk any time between May and July this year? If so, you might want to consult Apple's web site to see if you qualify for a free replacement of sorts; this is because the Cupertino giant has annouced a replacement program for a "very small number" of 1TB Seagate hard disks which are currently being used in the iMacs, claiming that the aforementioned hard disks sport an issue which could cause it to "fail under certain conditions".

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Apple announces hard disk replacement program for iMacs