TechwareLabs has published a video of the Hard Drive Click of Death Explanation and Live Demonstration. Here's a clip from the video:
Many of us have experienced the dreaded "Click of Death" that immediately tell us that our hard drive is dead or dying. What does the click of death look like? What causes it? Can I fix it by freezing my hard drive or giving it a whack? See a live demonstration of the click of death and hear an explanation for what causes it and some misconceptions for the common fix.