I recently upgraded my MCB Mid 2012 to 500 GB SDD in primary drive. I also used my existing 750 GB HDD in optical drive bay using a unibody caddy. The primary drive (500 GB SDD) is working fine. My old 750 GB HDD had two partitions. Now the secondary HDD is reflecting as two container disks. I would like the two to be merged back into a single drive, Is there any way to combine the two partitions into one? Also Is it possible to use the secondary drive as Time Machine Backup location?