[Gllug] Hard disk fail

[Chris Bell]

On Sun 01 Jun, Alain Williams wrote:
> 
> On Sat, May 31, 2003 at 08:48:02AM +0100, Chris Bell wrote:
> > On Fri 30 May, Mark Preston wrote:
> > > 
> > > Hi  all,
> > 
> > > "Primary master hard disk fail"
> > 
> >    I have had problems with sufficient power not reaching the drive. On
> > several occasions this has been caused by a power splitter device in the
> 
> PSUs seems to 'get tired' over the years and their output drops slightly, if you
> have a lot o disks, tape drives, ... you may, in time, exceede the ability
> to deliver.
> 
   The capacitors in switch mode power supplies take a bashing, which is why
they should be specially designed low impedance high temperature
electrolytics, with safety vents, and the power supply will fail if they dry
out, although I have found that many problems are just caused by dry joints
which go high impedance or open circuit as components get hot and the wires
corrode. Unfortunately these problems may then over-stress the
semiconductors which are very unlikely to partially fail but can totally
fail in microseconds. 

-- 
Chris Bell



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