> If all is good with a couple disks, and then starts failing with more,
> I would expect the PS to be the problem.

True, but.... I can have two drives connected to SATA 1 and 2, and a
third drive connected to SATA 3 sends things for a loop.  If I do not
connect anything to SATA 3 and 4,instead connecting 2 drives to the
motherboard and 2 drives to my 3rd party RAID card... everything works
fine... so with 3 drives I get failures, but with 4 it's fine as long
as the 3rd and 4th are not plugged into the motherboard SATA
controller.

I have a fairly new 600W PSU from BeQuiet in the case... so there
should be enough power for all devices.

I have done some more digging, and it might be related to an obscure
problem with the sata_nv kernel module.  Some people are reporting
similar problems.. not identical, but similar.  I found most of the
info via a long search through the mailing list archives at kernel.org
(thanks for the pointer Felix).  It only seems to affect some people
though... and I am not clear yet what exactly is going wrong... or if
there is a fix or patch to clear it up anywhere.  Still looking.


> * If you have an extra power supply lying around, connecting some of
> SATA devices to a separate PSU (don't do it for PATA) and seeing whether
> the problem continues and on which devices is a great way to rule out
> power problem.  You can power up a PSU without connecting it to a system
> by...
>
>  http://modtown.co.uk/mt/article2.php?id=psumod

I will give that a try and see.  I think I have a spare 400W PSU somewhere...

C
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