Click Of Death
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 returning the
head to its home position and then retrying, at times causing an audible
"click". In some devices, the process automatically retries, causing a
repeated clicking sound.
The phrase "Click of death" was coined by
Mac journalist Tim Robertson, and later publicized by David Pogue.
Originally the term was used to describe failing Zip drives, but
hard disk drives also became prone to the symptom.
Clicking hard drives are commonly the result of a
mechanical failure. However, there are times when this symptom arises
due to issues within the firmware, or system area, which prevent the drive
from calibrating properly. In
physical failures, the most common problem involves the
read-write heads. Either the heads have become physically damaged, or
have become dirty, or the preamplifier has failed. Unless the heads have
started to come apart and contacted the
platter surface, the problem is not as bad as it may sound. That's not
to say the recovery from these failures is easy, but the noise you hear
tends to exaggerate the actual symptoms. When customers hear their drive
clicking, they often times will visualize the head scraping, or crashing
into objects within the drive. There are times when that is the case,
however, most of the noise that is heard, is due to the head assembly
hitting a limiter as it sweeps back and forth across the platters looking
for the information it needs to calibrate. This limiter keeps the heads from
sweeping too far across the platter.
The important thing to remember is if your drive is clicking or making
any unusual noises at all, you should not power up the drive at all.
Continuing the operate the drive can cause further data loss. If you would
like more information about our services and how we can help you when you
hear the dreaded Click of Death, please call +9198725-30064,96469-30064
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