Rajko M. wrote:
Grounds commoned on motherboard side will show shorts on the other end too.
Wires are to short to see 2 wire lengths resistance with DMV, so it will
appear as short on both ends. They had to use existing ground pins on 40 pins
connector and they needed 40 extra wires between existing signal wires to
prevent crosstalk. More:
http://en.wikipedia.org/wiki/Advanced_Technology_Attachment
I never tried to find out exact reasons for the one side grounding.
I will remind everyone that grounding in multiple places is a bad idea.
Reason is what is known as a "ground loops". It ends up as hum or a
potential voltage differences - worse case heat. The idea of center
point ground means only grounded at one single point or at least the
additional 40 wires connected at the computer MB end and open on the IDE
Drive end. It can be used as a shield from adjacent signals coming from
the stray magnetic fields created around a conductor by current flowing
through a wire. If connected at both ends my guess it would cause
interference with the shifting of data (the reason SATA is better and
faster).
If they are NOT connected at either end - bad idea! All of those wires
that are floating would be about 144Mhz - 2M HAM length and with my 50
Watt Kenwood radio I could likely destroy your data day. Just think 40
antennas. Grounding them at one end is good to stop this effect.
--
73 de Donn Washburn
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Did you know?
The transistor was invented by three white men.
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