Can't erase failed install

Discussion in 'macOS High Sierra (10.13)' started by matty.p, Jun 10, 2017.

  1. matty.p macrumors 6502

    Joined:
    Jun 24, 2010
    Location:
    Portland, OR
    #1
    I attempted to install HS on an external SSD which failed at about 80%. I was able to restart and get back to my main internal HD without any problems. I went into disk utility to try and erase the external and try and reinstall. However I can't seem to get disk utility to reinstall or erase the external HD.

    I have tried multiple erase options but I always get the same error, "Couldn’t communicate with a helper application."

    Any help would be appreciated
     
  2. justperry macrumors 604

    justperry

    Joined:
    Aug 10, 2007
    Location:
    In the core of a black hole.
    #2

    Have you tried to erase the disk from the recovery disk Partition?

    Hold CMD-R at startup.
     
  3. matty.p thread starter macrumors 6502

    Joined:
    Jun 24, 2010
    Location:
    Portland, OR
    #3
    Tried that just now, same error.
     
  4. grahamperrin macrumors 601

    grahamperrin

    Joined:
    Jun 8, 2007
    #4
    Try a reset of NVRAM.

    If that error recurs, please provide a screenshot of Disk Utility; for us to see exactly what is selected.

    Also, please let us have output from the following commands:

    Code:
    diskutil list
    
    diskutil APFS list
    
    diskutil coreStorage list
    Hint: for legibility, use the icon to paste as code.
     
  5. Stefan johansson macrumors 65816

    Stefan johansson

    Joined:
    Apr 13, 2017
    Location:
    Sweden
    #5
    1, find a windows computer
    2, connect to disk
    3, format disk
    4, problem solved.
     
  6. justperry macrumors 604

    justperry

    Joined:
    Aug 10, 2007
    Location:
    In the core of a black hole.
    #6

    HFS+, Guess not.

    But joking aside, think I get where you want to go, first Format it with Windows, next try to do it again using DU, format as HFS+ GUID.

    Don't think a PRAM/NVRAM reset will work, neither a SMC reset.
    Disk Utility is fairly crappy nowadays, just a few OS versions ago it never failed on me, that's not the case anymore.
     
  7. grahamperrin macrumors 601

    grahamperrin

    Joined:
    Jun 8, 2007
    #7
    Not an SMC reset.

    NVRAM is a long shot based on the 'stickiness' that was known to occur, in some cases, with interruptions to installation of earlier versions of the OS.
     

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