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



Austin

Quite right - in fact there has been some recent press on the (bad) effects
of thermal cycling on solder joints which can go intermittent. And the other
major source of wear is the force on the various bearings during
acceleration and deceleration. It accounts for much more wear than running
at a constant speed, particularly if there's a lubricant that only gets
re-distributed once the spindle is running.

I don't think power spikes are as much of a problem as many people make
out - switched mode power supplies do a pretty good job. I suspect
manufacturer helplines find it easier to blame the electrical supply than
admit batch failures in their products.

Mike


> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Austin Franklin
> Sent: 01 April 2003 20:28
> To: mike.brown@mindblown.com
> Subject: [filmscanners] RE: HD failure [was RE: keeping the 16bit scans}
>
>
> Constantine,
>
> > When any equipment is turned off is NOT subjected to any
> > external stresses,
>
> When electronics is on, it is dissipating heat, and therefore the
> components
> are hotter.  When you turn the equipment off, the equipment cools down,
> thereby components are subject to thermal contraction.  Same with
> going from
> the off to on state, the components are subject to thermal
> expansion.  This
> does in fact cause critical wear to some components.
>
> There is also the issue of power on spikes, as well as power off spikes.
> These can be mitigated to a large degree, but that depends on the design.
>
> Austin
>
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