Attention iMac owners: if you purchased your computer between May 2011 and July 2011, there seems to be a problem with the 1TB Seagate hard drives. The affected iMacs may fail under certain conditions, which means the computer could be rendered useless and all data may be lost.
Here are all the highlights:
If there is any chance your iMac could be at risk, please take a moment to double-check by entering your Mac’s serial number on http://www.apple.com/support/imac-harddrive/.
If you do have an affected hard drive, Apple recommends making an appointment with them for a hard drive replacement as soon as possible. In the interim, make sure your backup system is working each and every day. It’s also very important to ensure you have a complete backup of your files before having your iMac serviced because Apple will be replacing your drive and you want to be absolutely sure you can restore your data when you get back to your office! Creating a Time Machine backup is the easiest way to achieve this and all you will need is: 1) 1TB external USB or FireWire hard drive (preferably one with no existing data on it), and 2) an available USB or FireWire port on your iMac.