I have Mavericks on my '08 macbook . I bought a new Toshiba 1TB HDD, and when I researched online I was under the impression that I can add partitions to an HDD without losing any information on the disk. I opened Disk Utility and Formatted the HDD to 400GB and 600GB partition as Mac OS Extended Journaled . I launched Time Machine and I backed my macbook to the 400GB partition and encrypted it. It worked. Now I want to add a 3rd partition to the HDD but that does not seem to be possible , as the (+) button in the "Partitions" tab in Disk Utility is not highlighted and is NOT selectable . If I selected the unused 600GB partition , I can only chose to take that partition out but I can not add any more to it. Can some one help?