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Subject: Re: Raid5 regression
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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.