[rc5] Re: OS/2 ramdisk and spindown
gindrup at okway.okstate.edu
Wed Oct 8 12:29:29 EDT 1997
MTBF: Mean Time (Before | Between) Failure -- Given a population of
individuals susceptible to failure, the (expected) length of time
before half the population has failed.
Of course, single individual samples may deviate wildly from the mean.
Typical failure curves are similar to your description: large spike at
the front followed by a very long flat period.
The statistic 1Mhr MTBF *does* indicate that the "average" drive will
last 1Mhr. Individual drives are expected to vary, and, given the
flat character of the failure curve, are expected to vary greatly.
-- Eric Gindrup ! gindrup at Okway.okstate.edu
______________________________ Reply Separator _________________________________
Subject: Re: [rc5] Re: OS/2 ramdisk and spindown
Author: <rc5 at llamas.net > at SMTP
Date: 1997/10/08 10:00
Sanford Olson wrote:
> Not to mention that the 1,000,000 hour MTBF (Seagate Barracuda 4.55GB)
> means that your hard drive will probably out-live your grandchildren! *grin*
MTBF means that if all the drives of that model were running at the same time,
and the total time they were running were added to each other they would run
for X hours combined!!! before one of them failed. Your drive could fail in one
hour or a million hours and still the rating overall could be 1,000,000 MTBF.
MTBF does not mean that your drive will run that long, or is supposed to run
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