Near Disaster Reverting to HFS+

Discussion in 'macOS High Sierra (10.13)' started by perquesta, Sep 21, 2017.

  1. perquesta macrumors newbie

    perquesta

    Joined:
    Mar 16, 2011
    Location:
    Canberra, Australia
    #1
    I have the latest 27" iMac.
    After a recent High Sierra beta formatted my Boot Fusion Drive to APFS, I attempted to revert the drive back to HFS+ in preparation for the release of High Sierra on the 25th. I used the routine outlined on the Apple Beta Software Program page.

    However, when I attempted to use step 8 (erase the boot disk using Disk Utility) the boot disk was rendered unavailable and I was subsequently not able to format it as either APFS or HFS+. Nothing I tried would work.

    Fortunately I had a backup on an external hard drive created by Carbon Copy Cloner. I was able to boot back into High Sierra using that disk. However, I am now having a little trouble restoring the iMac hard drive using Carbon Copy Cloner.
     
  2. tn-xyz macrumors regular

    tn-xyz

    Joined:
    Sep 13, 2017
    #2
    it should be resolved by following the terminal commands as stated on the same page. give it a try.
     
  3. perquesta thread starter macrumors newbie

    perquesta

    Joined:
    Mar 16, 2011
    Location:
    Canberra, Australia
    #3
    Thanks tn-xyz. I was using the first method, using an external drive. I did use the terminal commands to create a bootable installer on a 16Gb USB stick, but it led to the problems I described earlier.

    However, I am now pleased to announce that I was able to reinstate my hard drive using Carbon Copy Cloner, leaving me with beta 17A360a on a HFS+ system hard drive (1.03 TB Fusion Drive). Now I will wait till Monday to install the High Sierra release.
     
  4. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #4
    Your experience provides a good example of why a bootable cloned backup trumps a Time Machine backup nearly all the time.

    What would you have done without the CCC clone?
     
  5. robeddie Suspended

    robeddie

    Joined:
    Jul 21, 2003
    Location:
    Atlanta
    #5
    Agreed! CCC (or similar programs) that can make an exact, bootable clone have gotten me out of a pinch countless times over the years.
     
  6. perquesta thread starter macrumors newbie

    perquesta

    Joined:
    Mar 16, 2011
    Location:
    Canberra, Australia
    #6
    I've no idea. The software on the USB installer was no hope. I would have had no way of contacting the community for ideas. I was thinking of using Safari on my iPhone to search for possible solutions. I agree that CCC is a godsend. I was using a trial version, but promptly bought it afterwards.
     

Share This Page

5 September 21, 2017