Hard Drive Data Recovery | Hard Drive Media Damage
Hard drive media damage
Media damage is caused when the read/write heads punch through the air bearing (created when the drive spins up) and contacts the surface of the platters. When this happens, the heads scratch the surface destroying needed information for the drive to work at all, not to mention destroying your data.
Your drive may be no where near this damaged but any visible concentric scoring of the media renders the drive unrecoverable.