Recovering a partition on Fusion Drive without losing data

Discussion in 'iMac' started by imacken, Mar 14, 2018.

  1. imacken macrumors 65816

    Joined:
    Feb 28, 2010
    #1
    I have a 500Gb partition on my iMac that I want to put back into the main Fusion drive.
    How can I do this WITHOUT a wipe and reinstall?
     
  2. Fishrrman, Mar 14, 2018
    Last edited: Mar 14, 2018

    Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #2
    Can you delete it using Disk Utility?
    I would not attempt this UNLESS you have a just-done backup of your main partition.

    IF DU won't do it, my standard recommendation:
    1. Use a cloning app (CarbonCopyCloner or SuperDuper) to clone the contents of your main partition to an external drive, creating a BOOTABLE backup.
    2. BOOT FROM the cloned backup
    3. Open Disk Utility and ERASE the internal fusion drive. Set it up with one partition only.
    4. Now re-open your cloning app and RE-clone the backup BACK TO the internal drive.

    This will take some time, but it -WILL- "do the job" properly.
     
  3. imacken thread starter macrumors 65816

    Joined:
    Feb 28, 2010
    #3
    Thanks. I was trying to avoid all that. Don’t really understand why DU can’t do this (apparently) simple task.
     
  4. nambuccaheadsau macrumors 68000

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #4
    Recovering partition space is never simple.

    This 500GB partition ~ is it actually on the platter hard drive? If so follow the fisho's suggestion. It is quite simple if a little time consuming.
     
  5. imacken thread starter macrumors 65816

    Joined:
    Feb 28, 2010
    #5
    Thanks for your help guys. I know how to do it from scratch, but I really wanted to avoid doing all that.
    Oh well.....
     
  6. BLUEDOG314 macrumors 6502

    BLUEDOG314

    Joined:
    Dec 12, 2015
    #6
    Can you run 'diskutil cs list' in terminal and post what you get here please. I am not understanding your questions or how the partitions are laid out and would need that to help you.
     
  7. imacken thread starter macrumors 65816

    Joined:
    Feb 28, 2010
    #7
    See attached. I have a Fusion Drive of MacintoshHD (1.5Tb HDD + 121Gb SSD) plus a partition called Temp of approximately 500Gb. I just want to get my Fusion Drive back to 2Tb by bringing the 500gb back into Core Storage without reformatting/reinstalling etc. sg.jpeg sg2.jpeg
     
  8. imacken thread starter macrumors 65816

    Joined:
    Feb 28, 2010
    #8
    I've sorted it out. DU worked ok when booting from my CCC clone. All good now. Thanks for your help.
     
  9. vkd macrumors 6502a

    vkd

    Joined:
    Sep 10, 2012
    #9
    So did you manage to add the 500GB partition to the Fusion Drive? I would be interested to know how you did it because I too have a FD and understood that once created they are fixed in size and can't be altered.
     
  10. Bigdog9586 macrumors 6502

    Joined:
    Apr 15, 2015
    #10
    Funny how I’ve deleted my bootcamp partition twice now without losing any data from the Mac side.
     
  11. imacken thread starter macrumors 65816

    Joined:
    Feb 28, 2010
    #11
    Sorry about late reply.
    I did it by using DU from a bootable CCC clone, and yes, the 500Gb was added to the FD. DU wouldn't do it when I was booted in the FD itself. It just crashed!
    So, all good.
    --- Post Merged, Mar 17, 2018 ---
    Good for you. I wasn't asking about deleting the Bootcamp partition, I was asking about reclaiming the 500Gb back into the FD.
     

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10 March 14, 2018