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The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

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Re: [vox-tech] HD xfer
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Re: [vox-tech] HD xfer



WOW! I never expected this much info. The drive clicks
loudly, and seeks *very* slowly... I'll assume it is
(or is going) bad and maybe tear it apart to learn
more about hard drives!
Thanks,
ERic

--- ME <dugan@passwall.com> wrote:
> On Sat, 11 Aug 2001, Eric wrote:
> > I had a hard drive start clicking also, is that a
> sure sign the
> > hardware has "gone south"? Could there possibly be
> another
> > explanation?
> 
> Sure.
> 
> Depends partly on the sound and frequency of the
> click for some
> indicators of possible problems. (Listening is not
> really a science, but
> more like a best guestimate.)
> 
> Drive motor failure
> Spindle failure
> bearing (if they on on the drive) failing
> drive location reader failure (seek scans over and
> over)
> disk crash with head dragging on one of the disks
> heat damage to integrated circuits on board leads to
> intermittent
>  conductor failure
> arm tracking failure
> vibrations cause screws to come loose.
> 
> Many of the causes for many clicking sounds are
> mechanical failures. They
> can be caused by wear and tear, or physical abuse,
> or heat, or age or ??
> 
> I have not encountered an HD that made an audible
> odd clicking sound which
> did not eventually fail on average sooner than
> drives that did not make an
> audible clicking sound.
> 
> Probably many more kinds of problems for a HD are
> possible than there are
> parts in the HD.
> 
> Often, once failure of one part starts to occur,
> failure on other parts
> start to cascade in a slow-motion domino effect.
> 
> EG: bearing failures increase friction causing the
> motor to draw more
> power from the board which causes the motor to
> generate more heat, work
> harder and decrease motor life and the board to
> generate more heat in
> supplying power to the motor. Excessive heat and
> cooling (on for a while
> and off) during pre-existing problems may cause
> finely tuned metal parts
> to expand and contact enough to make contact in
> places they should not
> (head/disk)... Excessive heating and cooling may
> case micro-circuits to
> expand and contract and make the metal brittle
> enough to break in PCBs
> during the expansion and contraction beyond
> temperature ranges which were 
> expected for the device.
> 
> Some of above are much less common than others, but
> a failure in any
> critical part can kills the drive.
> 
> Solid state drives will be good! Perhaps future use
> of DNA Polymerase, or
> other enzymes to store data in "stable" molecules
> might be good if the
> process can be sped up with higher temperature
> enzymes (like those used in
> PCR for DNA amplification/replication in legal cases
> with insufficient
> tissue/blood samples.) Many enzymes are too slow for
> serialized building
> of molecules, but duplication can be very fast since
> you can have true
> parallel work during a molecular copy process.
> (woohoo!)
> 
> We'll probably see solid state drives long before we
> see bio-engineered
> drives, but once we have them, it might bring new
> meaning to, "my hard
> drive has been infected with a virus" (tee hee ;-)
> 
> -ME
> 
> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.12
> GCS/CM$/IT$/LS$/S/O$ !d--(++) !s !a+++(-----)
> C++$(++++) U++++$(+$) P+$>+++ 
> L+++$(++) E W+++$(+) N+ o K w+$>++>+++ O-@ M+$ V-$>-
> !PS !PE Y+ !PGP
> t@-(++) 5+@ X@ R- tv- b++ DI+++ D+ G--@ e+>++>++++
> h(++)>+ r*>? z?
> ------END GEEK CODE BLOCK------
> decode: http://www.ebb.org/ungeek/ about:
> http://www.geekcode.com/geek.html
>      Systems Department Operating Systems Analyst
> for the SSU Library
> 


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