Resolved Fusion Drive - Lost space on new iMac 27 5k

Discussion in 'iMac' started by numericum, Mar 3, 2017.

  1. numericum macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #1
    Hi guys i need help. i was trying to install windows 7 with bootcamp on my new fresh iMac 27 5k.
    After few minutes my iMac frozen (YEAH GREAT). After i restarted the computer and see that my full space 2TB fusion drive in snow just 1,6TB. Yes i lost somewhere 512GB (partition space for windows 7) and i don't know what to do.

    1. I tried to install again Windows 7 but i can't do it (an error occurred while partitioning the disk).
    2. I tried to delete the partition via Internet Recovery Mode but i can't do nothing here
    3. for me terminal is complicate think to understand

    here are some photos from terminal and disk utility. hope for help.
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    disk utility
     

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  2. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #2
    Backup to an external drive using Time Machine. Then follow my instructions in posts #6 and #14 in this thread to reformat and rebuild the Fusion drive at full size. Then restore your Time Machine backup from the recovery screen.
     
  3. numericum thread starter macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #3
    Hi Weaselboy. Thank you. I don't use Time Machine (yet). I don't care for these files on the new computer (i have all my things on my external drive) i just want my full size back. Thanks for post i will check and let you know
     
  4. numericum thread starter macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #4
    Hi Weaselboy.
    The first step is working ok #6 (split the disk in two part). But the second step for me was bad decison. Now i have Fusion Drive just 1,6 TB and i cant see all the 2,1TB space (original). What happend? I used the same codes as you mentioned in step #14. I think i have different diskutil list. Her is mine.
    If someone know how to fix this please help. Thank you!
     

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  5. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #5
    The 2TB drive still has two partitions on it and it looks like the Fusion is only using the 1.5TB one. After breaking up the Fusion drive open Disk Util and select the 2TB drive at the very top of the left column then go to the erase tab and format the entire disk back to one partition. Once you have that drive showing the full 2TB, then remake the Fusion and you should be all set.
     
  6. numericum thread starter macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #6
    If i understand you ill do it like this:

    0. Internet Recovery Mode

    1. Repat step #6

    Code:
    diskutil cs delete "Macintosh HD"
    or i need to change it in "Fusion" now?

    2. Open Disk Utility and select 2TB drive and erase and format back to one partition

    3. Pepeat step #14

    Code:
    diskutil cs create fusion disk0s2 disk1s2

    Code (my nymbers):
    diskutil cs createVolume DBFEB690-107B-4EA6-905B-2971D10F5B53 jhfs+ Fusion 100%


    Is this correct? What is this disk 18 (internal, virtual) 1.6TB in diskutil list?

    Thank you!
     
  7. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #7
    Exactly... and yes since you named it Fusion that is what needs to be in that command.

    That disk18 is the core storage (virtual) Fusion drive.
     
  8. numericum thread starter macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #8
    this step is not working :'(

    1. Repat step #6

    Code:
    diskutil cs delete "Fusion"
     

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  9. Weaselboy, Mar 4, 2017
    Last edited: Mar 5, 2017

    Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #9
    From your earlier screenshots there, it looks like it is lower case fusion and not Fusion. You don't need the quotes since it is one word.
     
  10. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #10
    What is the current result when you run diskutil list
     
  11. numericum, Mar 4, 2017
    Last edited: Mar 4, 2017

    numericum thread starter macrumors newbie

    numericum

    Joined:
    Mar 3, 2017
    #11
    Ok now is working

    Code:
    diskutil cs delete "fusion"



    .. let's see the last step 3.

    my diskutil list now after step 2. :
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    Yes!!! now is everyting ok:) thank you very much Weaselboy! :apple:
     

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