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[filmscanners] RE: HD failure [was RE: keeping the 16bit scans}


  • To: lexa@lexa.ru
  • Subject: [filmscanners] RE: HD failure [was RE: keeping the 16bit scans}
  • From: "Kapetanakis, Constantine" <KAPETAC@polaroid.com>
  • Date: Mon, 31 Mar 2003 09:54:14 -0500
  • Unsubscribe: mailto:listserver@halftone.co.uk

A mean time between failure of 300,000 hours does not mean one failure every
34 years.

The MTBF refers to the entire population of hard drives. i.e. if there are
300,000 drives in use then every hour (on average) one of the drives will
fail.

-----Original Message-----
From: Mike Brown [mailto:mike.brown@mindblown.com]
Sent: Sunday, March 30, 2003 4:45 PM
To: KAPETAC@polaroid.com
Subject: [filmscanners] RE: HD failure [was RE: keeping the 16bit scans}


In the intersts of keeping an interesting thread going here are some typical
reliability figures for hard drives:

Mean time Between Failure 300,000 hours (ie one failure every 34 years)

Start/stops (at 40 deg C) 40,000

On the basis of those figures I turned HD power management off on my PC. I
was finding the disks were getting turned off maybe twenty times a day,
which equates to one failure every 5 years or so.

Best regards


Mike Brown



> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Bob Frost
> Sent: 30 March 2003 10:57
> To: mike.brown@mindblown.com
> Subject: [filmscanners] Re: HD failure [was RE: keeping the 16bit scans}
>
>
> Laurie,
>
> Have you or anyone else seen data for MTBF due to recycling and
> MTBF due to
> bearing or other failure? Presumably the manufacturers must know how many
> startups/downs their drives will survive and how long the bearings will
> last. If we had that info we could balance one against the other and see
> where the optimum lies.
>
> Bob Frost.
>
>
> ----- Original Message -----
> From: "LAURIE SOLOMON" <laurie@advancenet.net>
> To: <bob@frost.name>
> Sent: Sunday, March 30, 2003 6:30 AM
> Subject: [filmscanners] RE: keeping the 16bit scans
>
>
>  When I say that turning a HD on and off has a negative
> effect in terms of wear and tear similar to that which might take place if
> one left the HD on all the time, I am speaking on the average and
> not to any
> particular individual case.  Unless, you are prepared to say that
> turning a
> HD on and off does not contribute to its wear and tear, the fact that you
> personally only do so once a week is sort of irrelevant as a refutation of
> my point. If you backed up or archived once a day every day, woulod you
> still be able to clain that the wear and tear of turning the drive on and
> off is less than keeping it on all the time during that week?
>
> ------------------------------------------------------------------
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