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From: magore@watdcsu.waterloo.edu (Mike Gore, Institute Computer Research - ICR)
Newsgroups: comp.sys.ibm.pc,comp.misc
Subject: Re: Leaving AT on overnight (good/bad)
Message-ID: <3751@watdcsu.waterloo.edu>
Date: Mon, 17-Aug-87 11:49:00 EDT
Article-I.D.: watdcsu.3751
Posted: Mon Aug 17 11:49:00 1987
Date-Received: Thu, 20-Aug-87 02:01:58 EDT
References: <1246@bloom-beacon.MIT.EDU> <768@custom.UUCP> <202@ttrdd.UUCP> <5911@ut-ngp.UUCP>
Reply-To: magore@watdcsu.waterloo.edu (Mike Gore, Institute Computer Research - ICR)
Distribution: na
Organization: U. of Waterloo, Ontario
Lines: 27
Keywords: 11,000 hours
Xref: mnetor comp.sys.ibm.pc:6839 comp.misc:1049

In article <5911@ut-ngp.UUCP> ayac071@ngp.UUCP (Bill Douglass) '> ' writes:
[in reply to]
In article <202@ttrdd.UUCP> mellman@ttrdd.UUCP (Thomas Mellman) '>> ' writes:
>>As far as that old argument that the electronics don't like power cycling,
[munch ...]
>I say, let 'er run.
...
>Bill Douglass
>ayac071@ngp.UUCP

	As another poster has pointed out the hard disk is the problem.
I have also found that hard disks reaching their MTBF is the greatest
risk from a cost point of view... It's more like a game of odd's taking into
account that most most semiconductor failures will happen during the
first month or so of use. In fact many people should _want_ such
problems to show up in these first first months of use so that warranty
repairs can still be made without cost. Thermo cycling tends to detach bonds 
or metalization layers that were defective during manufacturing early
in a products life time - on average... It's interesting to see
what happens when a fan in a power supply passes it's MTBF and dies [ they
must have clocks in them :) ] What happens next could be termed 
"short term burn in" ... :)


# Mike Gore 
# Institute for Computer Research. ( watmath!mgvax!root - at home )
# These ideas/concepts do not imply views held by the University of Waterloo.