Date: Wed, 31 Jul 2002 13:22:40 -0700 From: Bakul Shah <bakul@bitblocks.com> To: Jan Beck <janb@cs.utep.edu> Cc: freebsd-hardware@FreeBSD.ORG, freebsd-questions@FreeBSD.ORG Subject: Re: Harddisk damage by driver? Message-ID: <200207312022.QAA01618@sheffield.cnchost.com> In-Reply-To: Your message of "Wed, 31 Jul 2002 10:59:01 MDT." <000c01c238b3$91b0a6d0$0401a8c0@jan>
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> That brings up a very good question. How many people have had problems due
> to overheating?
Overheating increases the failure rate of drives -- According
to IBM, for every degree above recommended levels the rate
increases 2 to 3%. You may have been lucky but you can't
generalize your experience. Vendors test at a whole bunch of
drives under controlled conditions to derive these failure
rates.
IBM has this to say:
Several failure modes within a disk drive are exacerbated
by temperature. Thermal tilt of the disk stack and
actuator arms can occur very quickly and cause off-track
writes, corrupting data on adjacent cylinders. Outgassing
of the lubricants in the spindle motor and voice coil
motor occurs at high temperatures (experienced over a
relatively short 30-60 day time period), which can lead
to stiction failures or a possible head crash. Over an
extended period of time, the bearings can wear out and
cause mechanical failures
Conversely you can run your disk cooler than recommended
levels and see increased reliability (but don't extrapolate
too far!). You can buy disk drive cooling fans.
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