[other] Western Digital AAKS500 GB

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http://ubuntuforums.org – I've got here a Western Digital AAKS 500 Gigabyte HDD. There is a mechanical fault with the head and each time the system is powered up with the hdd attatched the sata port it makes a clicking noise. I unscrewed all the screws on the hdd to inspect the plates inside the disk and they seem to be in good nick. I'm not enitirely worried about recovering the information from the hard disk, I just want to recover the hard disk it's self by replacing the head inside the hard disk. Please may somebody tell me if this is possible as for I'm not entirely sure how to remove the head from the disk. Thanks. (Hardware)