Try replacing the IDE cable.  Both the HD and IDE controller have error
detection/correction over that cable (if I'm not mistaken).  If it's
getting errors, it may affect throughput.

On Sat, 2 Dec 2000, Yaron wrote:

>   Hi,
> 
> Well, I've narrowed it down to bad performance only occuring during HDD
> activity. It's IDE, it's supposed to be ATA/66, but when you accesss the
> drive intensly (untar, mkisofs) the load avarage goes WAY up and all other
> apps are affected. Playing mpeg/avi files off the thing is near
> impossible. 
> 
> The video capture works really badly as well... no idea what do to about
> THAT one...
> 
> 
> -Yaron
> 
> --
> 
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Timothy Houck
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