I have a mid-2011 iMac, 27-inch, 3.4 GHz Core i7, 16GB RAM 1333 MHz DDR3, Graphics: AMD Radeon HD 6970M 2048MB, 2TB HD. A recent backup using Carbon Copy Cloner reported some errors involving a bad sector on the startup drive, so I ran Volitans Software's "SMART Utility" software, which reported the drive as failing. Eek! Obviously I need to replace the drive. So I need some advice as to what drive I should replace it with, which ones would be appropriate - and reliable! It's a 2TB drive (and I need 2TB) so I guess SSD is out of the question. Also I have no idea about how one goes about doing the replacement. Who should replace it? Me? Is it easy? Would Apple charge a ton for doing it? Out of my depth here! Advice would be much appreciated !