Comment 24 for bug 527401

Confirmed: I retried it erasing all the partitions of the previous installation and recreated
all the partitions from scratch, all of the same size and primary:

/sda1 /sda2 ...
/sdb1 /sdb2 ...
/sdc1 /sdc2 ...

with the intention to build raids1 on /md0 (/sda1, /sdb1, /sdc1 - spare) and
/md1 (/sda2, /sdb2, /sdc2 - spare) for dual boot of U10.04 and CentOS 5.4

/md0 was OK, but building /md1 the installer/partitioner do not offer (do not see)
/sdc2 to be used as a spare.