Click of death is a term that became common in the late 1990s referring to the clicking sound in disk storage systems that signals a disk drive has failed, often catastrophically.
The clicking sound itself arises from the unexpected movement of the disk's read-write actuator. At startup, and during use, the disk head must move correctly and be able to confirm it is correctly tracking data on the disk. If the head fails to move as expected or upon moving cannot track the disk surface correctly, the disk controller may attempt to recover from the error by aborting the operation, at times causing an audible "click". In some devices, the process automatically retries causing a repeated clicking sound.
Read more about Click Of Death: Origin of The Term, Iomega Zip Drives, Hard Disk Drives
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