If you are using an iMac you must know iMac hard drive failure symptoms so that you can prevent data loss to certain extent. iMac is a desktop range manufactured by Apple. It has a powerful hardware and runs on the latest Mac OS X mavericks but there can be cases when the hard drive may fail and the data will be lost. If you are aware of the iMac hard drive failure symptoms then you can prepare your self and create a back up of important files you need. Some of the known symptoms are clicking or grinding noise of the hard drive, increased number of bad sectors, slowing down of iMac, frequent freezing or facing grey screen of death etc. Whenever you are noticing any iMac hard drive failure symptoms you must back up your data as soon as possible. But some times these failures are sudden and you may not get the chance to create backup. After the hard drive has been fixed you can use Mac data recovery software to recover all the corrupted and lost data during hard drive failure symptoms . It will also help you in future when iMac hard drive failure symptoms shows up again.