Can't delete partitions after attempting BOOTCAMP on my iMac 5k

Question

I recently tried to install a bootcamp instance of Win 7. The install failed for some reason. This left me with a partition that I can not access via Disk Utility

If you notice..the +- can not be selected and hence I can't delete the partition and recover the space on my drive

I tried to follow the instructions posted here by klanomath but have had no success.

It could be because I have 2 CoreStorage logical volume groups about which I have no clue as to what it is

Klanomath...can you please help me out???

diskutil list--

diskutil cs list--

sudo gpt -r -vv /dev/disk1--

Answer 1

Something went totally wrong and your Logical Volume Group is fragmented. You have to rebuild your Fusion Drive from scratch:

Preparation:

• Backup "Macintosh HD" to an external drive with Time Machine
• Detach any external drive (especially your external Time Machine backup drive)

• Restart to Internet Recovery Mode by pressing alt cmd R at startup.
  The prerequisites are the latest firmware update installed, either ethernet or WLAN (WPA/WPA2) and a router with DHCP activated.
  On a 50 Mbps-line it takes about 5 min (presenting a small animated globe) to boot into a recovery netboot image which usually is loaded from an apple/akamai server.

  I recommend ethernet because it's more reliable. If you are restricted to WIFI and the boot process fails, just restart your Mac until you succeed booting.

  Alternatively you may start from a bootable installer thumb drive (Yosemite) or a thumb drive containing a full system (Yosemite).

Rebuild Fusion Drive

• Booted to Internet Recovery Mode open Utilities → Terminal in the menubar and enter:
  diskutil cs list to get the CoreStorage listing.
• Copy the second Logical Volume Group UUID, it's the seventh listed in the listing of diskutil cs list.
• Then delete the second Logical Volume Group with diskutil cs delete LVG2UUID.
  In your case: diskutil cs delete E0E4516A-DE3A-4B62-BE6A-855A760F5E3E
• Copy the Logical Volume UUID it's the sixth UUID listed
• delete the Logical Volume with diskutil cs deleteVolume LVUUID.
  In your case: diskutil cs deleteVolume 00CDC215-F00D-4AD4-BA78-A2B220278688
• Copy the first Logical Volume Group UUID, it's the first listed in the listing of diskutil cs list.
• Then delete the first Logical Volume Group with diskutil cs delete LVGUUID.
  In your case: diskutil cs delete 8FCBCB92-43CC-45A2-A058-58CAF79B93B4
• Enter exit and quit 'Terminal'
• Open 'Disk Utility'. Enter 'Ignore' if you are asked to fix the drives.

• Choose your SSD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
  Please check that the size is ~121 GB

  Example:
  Beware! Since I took the screenshots in a virtual machine which couldn't be booted to Internet Recovery Mode i had to create two example disks with different disk identifiers and sizes. So don't use my UUIDs and disk identifiers recreating your Fusion Drive.

  

• Choose your HDD and partition it: 1 Partition Mac OS X Extended (Journaled), hit the Options button and choose GUID Partiton table and hit OK and Apply.
  Please check that the size is ~3 TB

  Example:

  

• Quit Disk Utility and open Terminal

• Enter diskutil list

  Example (your disk identifiers and sizes are different of course: Your volume SSD probably has the Identifier disk0s2 and the size 121 GB and your volume HDD probably has the Identifier disk1s2 and the size 3.0 TB):

  

• Enter diskutil cs create "Name" IdentifierSSD IdentifierHDD
  In your case probably diskutil cs create "Macintosh HD" disk0s2 disk1s2.

  Copy the resulting LVGUUID

  Example:

  

• Enter diskutil cs CreateVolume LVGUUID jhfs+ "Macintosh HD" 100%.

  Example:

  

• Enter diskutil cs list
  Check the size of your Logical Volume. It should have the size ~3.121 TB

  Example:

  

• Quit Terminal

• Open 'Disk Utility' and check your newly created volume for errors
• Quit 'Disk Utility'

Restoring "Macintosh HD" from Time Machine backup (alternatively you may reinstall OS X and migrate your users and apps - see below)

• Attach your external Time Machine backup drive or check this answer if you use NAS or another network share.

• Open 'Restore from Time Machine Backup'

  

• Choose the appropriate Time Machine backup and restore your system
  The messages on your screen may differ slightly (different names and backup source)

  

• Reboot to your restored system.
• Unmount and detach your Time Machine backup drive
• Open 'Terminal' and enter 'diskutil list'
• Check if your 'Recovery HD' is listed.
• If your 'Recovery HD' is missing, usually reinstalling your current system with the latest available system installer (e.g. 'Install OS X Yosemite (10.10.2)' if Yosemite is currently installed) will recreate it without loosing any data. AFAIK Recovery Partition Creator 3.8 will NOT create a Recovery HD on CoreStorage volumes.
• After reinstalling the system with the latest available system installer open App Store and install the latest security fixes.

Reinstalling Yosemite from scratch and migrating apps & data from Time Machine backup

• Choose "Reinstall OS X"

  

• Choose "Macintosh HD" as destination disk
• after the download, installation and a restart the Setup Assistant will ask you - beyond other questions - to migrate users, apps and other data
• attach your Time Machine Backup drive and wait a few seconds
• choose "Migrate from Time Machine backup" (or something similar - i don't remember the precise message.)
• finish the migration
• start App Store.app and install the latest updates.