Missing disk space after failed bootcamp partition

Sorted it with:

diskutil repairDisk /dev/disk0 

From recovery mode.

Now I just need to figure out why I can't partition my disk anymore. Tried three more times but in all instances it hanged after reaching about half-way in the creating partition stage. Got no local time machine snapshots (they're on an external drive), so its not that. Ugh.

   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            2.0 TB     disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage Macintosh HD            121.0 GB   disk1s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3

/dev/disk2 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +2.1 TB     disk2
                                 Logical Volume on disk1s2, disk0s2
                                 FE896926-6556-4167-9727-6AE772587267
                                 Unencrypted Fusion Drive

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 5B113CF5-AF4E-437D-86BA-94CC9773F3C8
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         2120528027648 B (2.1 TB)
    Free Space:   114688 B (114.7 KB)
    |
    +-< Physical Volume 5C572DA8-7561-4DF2-8CC2-F6BB9092B444
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     120988852224 B (121.0 GB)
    |
    +-< Physical Volume B439E586-F1C5-4163-84B1-F8C7A95543CF
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     1999539175424 B (2.0 TB)
    |
    +-> Logical Volume Family 5F980324-88C8-402D-849C-F43C14D00DD8
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume FE896926-6556-4167-9727-6AE772587267
            ---------------------------------------------------
            Disk:                  disk2
            Status:                Online
            Size (Total):          2113921613824 B (2.1 TB)
            Revertible:            No
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

Tried that yesterday. Unfortunately it appeared to stall and crash in the same way, although with disk utility it said the stage was (paraphrasing as I don't remember the exact words) "resizing storage". Resulted in the same missing space issue and was rectified in the same way (recovery boot and repairDisk).

Ok tried making a smaller partition, 10gb.

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            2.0 TB     disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s5

   4:       Microsoft Basic Data U                       9.1 GB     disk0s6



/dev/disk1 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *121.3 GB   disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:          Apple_CoreStorage Macintosh HD            121.0 GB   disk1s2

   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3



/dev/disk2 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           +2.1 TB     disk2

                                 Logical Volume on disk1s2, disk0s2

                                 FE896926-6556-4167-9727-6AE772587267

                                 Unencrypted Fusion Drive



/dev/disk3 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            Boot Camp              +1.2 GB     disk3

Took 5 minutes. So maybe its the size of the disk I'm trying to make?

Note: the disk3 boot camp partition appeared after I downloaded the windows support software. I'm guessing thats usual behaviour

Got it sorted. Partitioned and removed incrementing the size as I went. 50gb - 100gb took 20 minutes. 100gb - 200gb took 50 minutes, 200gb - 250gb (original partition size) took an hour, 250gb - 350gb 20 minutes (shorter?), and finally 400gb took 12 minutes.

After that I did it with Bootcamp assistant which worked in 10 or so minutes but it failed to copy the windows files over. The ISO was too big for the partition format. So had to source an older copy with a smaller size (1709).

That then worked but when I got to the windows installation, notably the partition selection screen, I was met with the error 'We couldn't create a new partition or locate an existing one'. This was solved with a PRAM reset..

After that everything was gravy. Was up and running in around 10 minutes after that.

Thank-you for your help

Also just as a note, while partitioning with either application my computer slows to a crawl. Apps become unresponsive and I get the rainbow spinning disk when I try to do anything.