Hard Drive Error Disk or Motherboard?

[Paul Ward]

Hi All,

Thanks for your input on this problem I now have a work around.

I decided the best thing to do is not know about the problem and
disabled the bios smart and the smartd service, at least I don't get
the errors now.

Perhaps Santa willl bring me some goodies? ;)


On 22/11/06, Les <hlhowell at pacbell.net> wrote:
> On Tue, 2006-11-21 at 12:04 -0500, Gene Heskett wrote:
> > On Tuesday 21 November 2006 09:33, Mel wrote:
> > >Alan wrote:
> > >>   Controller<=====Longest Part of cable===>Drive2<===Short
> > >> bit===>Drive1
> > >
> > >If I remember my cable theory correctly, all cables should be terminated
> > >in their characteristic impedance at both ends. If not, then reflections
> > >occur.
> > >
> > >The higher the frequency, the greater effect they have on reliable use
> > >of the cable. As you said, cable length is also a factor.
> > >
> > >Isn't this what "Time Domain Reflectromitry(SP?)" is based on?
> >
> > The spelling will do, its reflectrometry, and the answer is yes.  The
> > problem is that to do it on cables as short as the 18 inchers used for
> > ide connections, it takes some very expensive versions of it since one
> > must be able to see, and detect an anomoly thats only 1/8" wide.  There
> > are fast samplers, and there are damn fast samplers.  For longer stuff,
> > I've used just a schotkey ttl gate as the signal, and a 100mhz scope to
> > read it.  There I can see with an accuracy of maybe 10 feet over 500 with
> > that simple a lashup.  With the real thing, I can see the individual
> > connectors and insulators in a length of 3.125" transmission line but I
> > can only see burnouts with my simple lashup because its not fast enough
> > by a factor of 100 or so.
> > --
> > Cheers, Gene
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > -Ed Howdershelt (Author)
> > Yahoo.com and AOL/TW attorneys please note, additions to the above
> > message by Gene Heskett are:
> > Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
> >
> There is a difference between how digital data is handled and analog
> data, IF the cable length is <=1 wavelength.  Digital drivers are
> designed to work into an unterminated line, to produce a voltage high
> when the switch transition reaches the end of the cable.  This works
> because the driver is back terminated with the line impedance (between
> 20 and 1K ohm depending on the line design), which means that the signal
> input end instaneously transitions to V/2, propagates at that level to
> the "open" end, then rises to the input level (as long as the line
> leakage is sufficiently high and the transmission q is >=10.  IDE
> generally meets these requirements, until you begin to drive it at about
> 40-45Mhz.  At the latter frequencies and higher, IDE must be terminated
> and the line voltage will be lower.  Some of the problems with open
> digital drive are: 1. radiation due to the harmonic coupling of
> reflections
> 2.  excess power required to fully charge the line. 3. Pin to pin
> leakage of the high frequency components.  This may be avoided to some
> degree by controlling the edge rise and fall times as some drivers do.
>
> This is my area of expertise for over 40 years of measurement and
> analysis.
>
> Regards,
> Les H
>
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