I have a ABIT KR7-A and was thinking about mirroring two drives. Is it possible to mirror a partition??

I have a 80gb hard drive with a 10Gb boot partition (c
I also have a 40Gb drive with a 10Gb partition. Can't I create a Mirror with the two partitions?? (Both are 7200Rpm)

From what I read up on I think It is only possible to Mirror DRIVES and not PARTITIONS. Is this true?? What a waste! (For me anyways)