IAMBOB:

If your hard drive is clicking abnormally, you probably have mechanical damage to the drive. It may or may not have harmed the disk surfaces, but it is not a good sign. If you need the data on the drive, you may have to resort to a data recovery service, since nothing you could really do externally would restore the drive to operable condition. Continued operation of the drive in that condition could also have a negative impact on the success of any data recovery, if you choose to go that route. I had a Toshiba drive recently that failed in a similar manner. The drive was replaced by Toshiba under warranty. It would have cost much more than it was worth to recover the data. I had the important stuff backed up and it was just a matter of reinstalling the OS. I have recovered information from drives in the condition you described. It involves swapping parts from another drive that is the same as the broken one. Sometimes it works like a charm. Sometimes it's just a waste of good parts and time.