Thanks Phillip!  That worked for me as well!

I can now sudo mount /dev/dm-1 /media/RAID and read and write to it
without breaking the array.

The issue where the RAID is shown as broken after a soft reboot is
resolved as well.

Some of the research that I did on this issue since my last post
indicates that this HPA could have been created by the "Xpress recovery"
feature of this motherboard.  This is supposed to create a system
restore partition at the end of a hard disk, much like is found on some
laptops, and some sources on forums indicate that these partitions are
commonly hidden by the BIOS using HPA.  I was trying to find a way to
use the feature to change which drive it uses to apply HPA.  The funny
thing is that this board does not support the feature at all when the
RAID controller is turned on, so I could not even load the configuration
utility to see if it had such an option.  Other people with similar
features on their motherboards might need to use this same workaround.

Thanks again, Phillip, for your excellent detective work and problem
solution.

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ich9R raid array not detected
https://bugs.launchpad.net/bugs/219393
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