Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
Something has gone wrong with the disk size detection. Grub thinks the
size of the disk is 488396800 sectors instead of the 488397168 that
fdisk reports. This shorter size causes the partition to appear to run
right up to the end of the disk and thus, the raid superblock is found
both at the end of the disk and the end of the partition.