Users who purchased a 27-inch iMac between December of 2012 and September of 2013 may experience hard drive or Fusion Drive failure "under certain conditions" due to problem with the hard drive component. Apple has now announced a replacement program that largely covers the "late 2012" 27-inch iMac (though it may also include some early mid-2013 iMacs), and will contact registered owners of the affected units to offer a free swap out of the drives, regardless of warranty status.
