[rc5] Re: OS/2 ramdisk and spindown

Eric Gindrup 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 
that long.

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