I was beta-testing an Operating System and set up a separate 50 GB partition on my single 500 GB SSD. Now I cannot remove the beta partition. It shows up as another disk entirely. What can I do? enter image description here enter image description here

As you can see, I can't make any modifications to the partition structure (no + or - available, nor can I rename a partition). I should also add that the primary 450 GB partition is encrypted with FileVault 2, but the beta partition was not encrypted.

   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         447.6 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:          Apple_CoreStorage                         51.1 GB    disk0s4
   5:                 Apple_Boot Recovery HD             650.0 MB   disk0s5
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS β                     *50.5 GB    disk1
                                 Logical Volume on disk0s4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *447.3 GB   disk2
                                 Logical Volume on disk0s2
                                 Unlocked Encrypted
  • Logical Volume Group ... world of pain since Yosemite. One of the main reasons I'm not touching it yet. Maybe try apple.stackexchange.com/questions/134498/… Edit after your edit - FileVault will make the drive into the LVG [Core Storage] – Tetsujin Oct 21 '14 at 16:55

Thanks @Tetsujin. The listing looked a little screwy so I was a little hesitant to go mucking around with the command-line diskutil. But I ended up doing a

diskutil corestorage list
and then

diskutil corestorage delete [UUID of 50GB Logical Volume Group]

GUI Disk Utility correctly saw the 50 GB of empty space as part of the other Logical Volume Group and I was able to delete it and merge it back in fine.

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