I have a ~250GB SATA drive that I like to use as a spare media/storage drive. I came upon another drive about the same size but it's IDE. I figured I'd make them one logical volume using JBOD RAID, but then figured I'd be better off mirroring them in case one dies. How do I create a RAID1 array using the existing disk w/ data (/dev/sdc1) and mirror it to the newly added disk w/ no data (/dev/sdb1)? I'm using Ubuntu Intrepid Ibex as my OS.