Comment 13 for bug 600729

Thank you Peter for confirming that current git version of GParted does correctly list your firmware RAID array.

When GParted is started, it invokes the command "dmraid -ay -v" to ensure that the /dev/mapper device entries are created.

If you have found a problem in the boot log, then you might wish to try the following command to check if there is a problem according to parted:
     parted /path-to-your-dmraid-device unit s print

If there is a partition that extends beyond the end of the disk, my first suspect would be the extended partition if you are using an MSDOS partition table.