I had the same problem working with a 3TB array.  I created 7 partitions
on a gpt label with parted from 7.10 64bit desktop.  I then used hdparm
-z /dev/sda to reread the partitions, but the OS only saw the first 4.
I then chrooted into SLES 10 and used the parted from it.  It gave the
same error message regarding the bad gpt label that has been reported
already.  I made 1 small change so that the SLES10 version of parted
would rewrite the partition table, and then hdparm -z /dev/sda correctly
read the partition table after that.

Also, I have a patched version of grub that works with gpt partition
tables.  I can provide it if necessary.  This patched version also
wouldn't work until I used the parted from SLES10.  The parted from
ubuntu 7.10 64bit desktop left the partition table in a state that would
not work with my patched grub.

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non working gpt labels
https://bugs.launchpad.net/bugs/107326
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