~124GB is missing/inaccessible from Disk Utility.. I'm unable to resize the main partition, I'm unable to manipulate the missing space (delete, etc without erasing the entire disk). First aid on the disk and the partition said there's a problem and to boot to recovery and run First Aid there. Did that and it reports it cannot fix the problem.

The disk is encrypted, I don't know if that matters.

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF Macintosh HD            375.1 GB   disk0s2
   3:                  Apple_HFS Recovery HD             650.0 MB   disk0s3

/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +374.8 GB   disk1
                                 Logical Volume on disk0s2
                                 Unlocked Encrypted

/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +686.4 MB   disk2

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  • Is there a question here?
    – Allan
    Jun 10, 2017 at 2:06
  • @Allan - yeah - why is there a significant chunk of disk space that diskutility isn't seeing?
    – marathon
    Jun 10, 2017 at 17:12
  • Do you know how your partition map became corrupted? I would expect disk0s2 to be of type Apple_CoreStorage and be 1 GB or so less in size than disk0 which I believe matches your space expectations. See apple.stackexchange.com/a/214827/5472 for what I expect a healthy 500 GB drive to look like with 499.4 and 499.1 sizings on the physical and virtual Macintosh HD core storage volumes respectively.
    – bmike
    Jun 10, 2017 at 17:38

1 Answer 1


It turns out the GUID partition table/map for that drive was corrupted, and that is why 124GB were missing.

The solution is:

  1. boot to recovery mode
  2. Launch terminal
  3. run gpt show to see partition indexes, start blocks and sizes, note carefully.
  4. use gpt remove -i <index> to remove each partition in reverse order
  5. use gpt add -b <start block> -i <index> -s <size> -t <type UUID> to rebuild the partition map in reverse order.

Note: the UUID 53746F72-6167-11AA-AA11-00306543ECAC is for partition type Apple_CoreStorage, which is what the encrypted partitions use. EFI boot and also recovery partitions are 426F6F74-0000-11AA-AA11-00306543ECAC

related question.

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