If you bought an iMac with a 3TB hard drive between December 2012 and September 2013 and you’re having problems with that drive, Apple will replace it for free.
The iMac (27-inch) 3TB Hard Drive Replacement Program replaces 3TB hard drives that, according to Apple, “fall under certain conditions.” The service will be performed at your local apple Store or at a nearby Apple Authorized Service Provider.
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The 3TB hard drive was a custom option for the 27-inch iMac. It was not part of the standard configuration. These iMacs were among the first to feature the new thin design.