Xref: utzoo comp.misc:2058 comp.terminals:611
Path: utzoo!mnetor!uunet!husc6!bbn!spdcc!ftp!dab
From: dab@ftp.COM (Dave Bridgham)
Newsgroups: comp.misc,comp.terminals
Subject: Re: Does Turning off PC's everyday do any real damage?
Message-ID: <120@ftp.COM>
Date: 7 Mar 88 16:25:14 GMT
References: <1727@ssc-vax.UUCP>
Organization: FTP Software Inc., Cambridge, MA
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Keywords: I hate Keywords


	With powering off PC's, one of the important things to
consider is the thermal cycling of the picture tube filament.  I
havn't read of any studies with picture tubes, but I have with with
flourescent lights.  Many places leave their lights on all the time on
the belief that this prolongs their life.  It was found that this is
not necessarily the case.  If the lights are on continuously for 10
hrs a day and off the rest of the time, they lasted longer than if
they were left on 24 hrs a day.  I'm not sure how well the results of
the lights study transfers to picture tubes, but the problem is
basically the same.
	The other thing I would be concerned about is spinning up and
down hard disks.  This is when most head crashes occur.  I don't have
any hard information about that though.

						David Bridgham