Messed up partitions due to dual booting 10.10 and 10.11

[superiska123]

So,
A while ago I decided that I had to try out the new OS X El Capitan, but I didn't want to do a full wipe of my computer, so I just made a partition on my main OS X Yosemite Hard Disk.

Everything was working great, BUT I was running short of memory on both the OSs so I decided to simply delete the El Capitan Partition. BIG mistake. It deleted just fine, but now I can't expand my Yosemite partition, and I can't create a new, empty partition in place of the old one either...

So, my question is: What should I do next? I have no problem in reinstalling the whole OS, but I am unsure if I would be able to merge the partitions even in the installation mode.

Thanks in advance!

 

[Weaselboy]

Run each of the commands below in Terminal and tell me what it says? Your drive may have been converted into a core storage volume that will take a little finagling to undo.

diskutil list

diskutil cs list

 

[superiska123]

Weaselboy,

I have typed the commands that you have mentioned, and it seems to me that it is converted to a core storage volume...

Anyways, when I typed the first command this showed up:

  #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *320.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         237.9 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *237.5 GB   disk1
                                 Logical Volume on disk0s2
                                 29B3B533-71B1-431D-8D04-CBD6FDBEA433
                                 Unencrypted

And the second command:

CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 4A1F97C0-D4AD-486F-9C3E-3C1FEA0FCFE0
    =========================================================
    Name:         Macintosh HD
    Status:       Online
    Size:         237900222464 B (237.9 GB)
    Free Space:   18907136 B (18.9 MB)
    |
    +-< Physical Volume 0CC9E33C-3E75-4670-AE13-46E2FBA7F4D6
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     237900222464 B (237.9 GB)
    |
    +-> Logical Volume Family 59F241DC-C198-4245-87B2-E4B58D0D74A2
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         None
        Conversion Status:       NoConversion
        Conversion Direction:    -none-
        Has Encrypted Extents:   No
        Fully Secure:            No
        Passphrase Required:     No
        |
        +-> Logical Volume 29B3B533-71B1-431D-8D04-CBD6FDBEA433
            ---------------------------------------------------
            Disk:                  disk1
            Status:                Online
            Size (Total):          237528993792 B (237.5 GB)
            Conversion Progress:   -none-
            Revertible:            Yes (no decryption required)
            LV Name:               Macintosh HD
            Volume Name:           Macintosh HD
            Content Hint:          Apple_HFS

So, what do you reckon I should do next?

Thanks a lot in advance for your help

 

[Weaselboy]

So, what do you reckon I should do next?

As I suspected, the volume has been converted to core storage and cannot be resized normally. Disconnect any other drives then run the command below in Terminal to revert the core storage, then you will be able resize with Disk Util normally.

diskutil cs revert /

 

[superiska123]

Okay, so I did what you told me, but everytime I try to resize it it says:

Partition failed for disk Macintosh HD
Couldn’t modify partition map because file system verification failed.

 

[Weaselboy]

Okay, so I did what you told me, but everytime I try to resize it it says:

Did the revert complete? Do "diskutil list" again make sure it does not show the core storage any longer.

It sounds like you have a disk error in addition to the core storage issue. Try a command-r boot to recovery and run a repair disk and see what that reports.

 

[superiska123]

Did the revert complete? Do "diskutil list" again make sure it does not show the core storage any longer.

It sounds like you have a disk error in addition to the core storage issue. Try a command-r boot to recovery and run a repair disk and see what that reports.

OK Thanks a lot for your help, I think I'll manage by myself from here... Core Storage just didn't cross my mind before you mentioned it, but now I know what I'll do!