A notice has been issued by Apple of a recall of potentially defective 1 TB Seagate hard drives installed in iMacs sold in-between May and July of 2011. Apple has offered the replacement of possibly defective drives free of charge until July 23, 2012.
The drives installed in both the 21.5 and 27-inch configurations of 2011-model iMacs may fail under “certain conditions” that has led to the recall. If your iMac is one of those roofed under the recall, you can take along your iMac in to the local Genius Bar or set up an appointment with an Apple Authorized Service Provider.
Apple will not restore your data for you, so to ensure you don’t lose anything, before taking your iMac in for service make a full backup of your drive using Time Machine or another backup solution. Apple does advise replacing the drive as soon as possible, so if you have one of the affected iMacs but haven’t been backing up your data, you should better start now.