I have an external drive with two partitions. One was a clone of Mavericks; I just erased that drive and figured I'd merge the partitions (.5 and 2.5 TBs). But I notice that now I seem to have both logical and physical volumes of that .5TB; somehow that volume got core storaged. I cannot now resize the 2.5TB partition to 3TB, merging the empty .5. Disk Utility does, however, give me the option to merge the 2.5 up, but I believe that would destroy the data. So, do I have to use diskutil revert cs on the logical .5 to be able to subsequently merge it? some other way?