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Date:	Mon, 3 Mar 2003 09:51:44 PST8
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Drive stiction ?

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In <3E637656.1A7A@peterskye.com>, on 03/03/03
at 07:40 AM, Peter Skye said:

>Does anyone know what period of time is involved in having both a new and
>an old drive develop stiction?

Steve's answer may be a either form of preventative maintenance or a form
of detecting the problem sooner than otherwise. :-)

That said, I consider stiction a failure mode. If a drive develops
stiction before the end of it's rated life or MTBF, I consider the drive
out of spec. So, what I'm saying is that stiction should not occur before
either of these time periods.

As I understand the specs, rated life is wall clock time, regardless of
whether or not the device is in operation. MTBF applies to operational
time. These days rated life for disk drives is far smaller than MTBF and
the MTBF far exceeds the current MTBF for humans.

Some spec's will quote shelf life, which is the number you really seem to
be asking for. However, this usually applies to time before first use,
not periods of inactivity.

Steven

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"Steven Levine" MR2/ICE 2.35 #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
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