Tom, I believe that you have encountered two separate problems.

1)  "Can't have a partition outside the disk!".

To diagnose this problem, the output from the command "fdisk -l -u
/dev/mapper/pdc_jcchiiab" would be useful.  That way we can determine if
one of the partitions (perhaps the extended partition) goes beyond the
end of the disk.

2)  GParted does not show the /dev/mapper/pdc_jcchiiab device (bug
554582)

I have been able to confirm this as a problem using the
"ubuntu-10.04-beta2-desktop-i386.iso" disk image.  My Intel software
RAID (/dev/mapper/isw_cjbdddajhi_Vol0) does not display in the drop down
list in GParted.

GParted Live 0.5.2-7, which uses parted-2.2, does work and successfully
recognizes my Intel Software RAID.

It is possible that this problem might be fixed by a patch that has been 
applied to the Fedora copy of parted-2.2:
"Parted should not canonicalize symlinks under /dev/mapper (#577824)"
http://koji.fedoraproject.org/koji/buildinfo?buildID=165650

Since Ubuntu has also patched parted-2.2, it is also possible that this
change has impacted the ability to recognize dmraid devices.

-- 
Disk detected as unallocated
https://bugs.launchpad.net/bugs/48412
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