Despite what Apple execs would have you believe with their flowery language, Apple products aren’t perfect. This is especially the case of the Apple faithful that have 27-inch iMacs that were manufactured between December 2012 and September 2013 and include a 3TB HDD.
According to Apple, it “has determined that a very small number of 3TB hard drives used in 27-inch iMac systems, may fail under certain conditions.” Owners that have already registered their systems with Apple using a valid email address will automatically be contacted to arrange for a HDD replacement. If you haven’t registered with Apple, you can simply enter your serial number on the replacement program website (see the link below) to see if your iMac is affected.
Apple is providing two ways to get your iMac’s HDD replaced (if it is among the affected group): you can schedule an appointment with a Genius at your local Apple Retail Store or take your iMac to an Apple Authorized Service Provider for a replacement. If you already paid to have your hard drive replaced for this same issue, Apple is offering to reimburse your costs.
It should also be noted that when your hard drive is replaced, your machine will be reverted back to a factory fresh state. So Apple strongly recommends that backing up all of your data before you take your 27-inch iMac in for service.
This service campaign is only one through December 19, 2015 so if your iMac is affected, don’t drag your feet when it comes to getting a replacement.