On Friday, Apple announced that it would replace some Seagate 1TB hard drives included in recent iMacs that could "fail under certain conditions."
The free iMac 1TB Seagate Hard Drive Replacement Program is intended for a "very small number" of Seagate 1TB drives used in 21.5-inch and 27-inch iMacs sold between May 2011 and July 2011.
Apple said it was contacting affected iMac owners who provided a valid email address when registering their iMacs. I f a user thinks their system qualifies for the replacement, they can enter their iMac's serial number on the replacement programme page. (Apple explains how to find your serial number in a support document.)
If your iMac requires a replacement drive, you have the option to set up a Genius Bar appointment in an Apple retail store, visit an Apple authorised service provider, or contact Apple technical support for local service options.
Apple will replace a drive until July 23, 2012, but notes that the programme doesnot extend the standard warranty coverage of your iMac. And of course, you're responsible for backing up the contents of your current hard drive, since Apple won't provide that service.