The difference of Apple+option+R & Apple+R

Discussion in 'macOS' started by blackxacto, Sep 29, 2017.

  1. blackxacto macrumors 6502a

    blackxacto

    Joined:
    Jun 15, 2009
    Location:
    Middle TN
    #1
    17,1 iMac 10.12.6 w Fusion Drive

    Tonite I wanted to reinstall Sierra 10.12.6. So I chose to hold Apple+Option+R, then rebooted. The installer window then asked me to CONTINUE to install High Sierra. I stopped.

    I rebooted, holding Apple+R, and was asked to install Sierra. I stopped to ask the forum a question:

    Why would I be asked to install High Sierra on a Fusion Drive?
    What is the difference in the two key combinations?

    Normally in the past, I thought either key combo would allow me to install the latest system, for my iMac. Has that changed?
     
  2. prisstratton, Sep 29, 2017
    Last edited: Sep 29, 2017

    prisstratton macrumors 6502a

    prisstratton

    Joined:
    Dec 20, 2011
    Location:
    Winnipeg, Manitoba, Canada
  3. blackxacto thread starter macrumors 6502a

    blackxacto

    Joined:
    Jun 15, 2009
    Location:
    Middle TN
    #3
    “Option-Command-R. Upgrade to the latest macOS that is compatible with your Mac.”

    Why I posted to the forum is because this key combo, gave me the High Sierra download, which ain’t compatible with my fusion drive iMac?
     
  4. prisstratton macrumors 6502a

    prisstratton

    Joined:
    Dec 20, 2011
    Location:
    Winnipeg, Manitoba, Canada
    #4
    The title of your thread asked about the difference between the two options, the page I listed showed that difference.

    Your system with a fusion drive can install High Sierra, it would just use the existing HFS+ format as opposed to the new APFS. Full APFS support for fusion drives will come in a future release.

    Your stated that you wanted to reinstall Sierra, so why are you worrying about High Sierra.
     
  5. blackxacto thread starter macrumors 6502a

    blackxacto

    Joined:
    Jun 15, 2009
    Location:
    Middle TN
    #5
    Had no idea HS could be safely installed on fusion drives. Where did you see Apple saying this was possible?
     
  6. prisstratton macrumors 6502a

    prisstratton

    Joined:
    Dec 20, 2011
    Location:
    Winnipeg, Manitoba, Canada
    #6
    I have not seen any specific report from Apple that explicitly states that.

    However, people are reporting that it does install on fusion drives, but the HFS+ format is maintained, please see here:

    https://forums.macrumors.com/threads/fusion-drive-seems-slow-after-high-sierra-update.2073204/

    Proceed at your own risk.

    Personally, I would not perform this upgrade until your fusion drive is fully supported, why go through two upgrade processes.

    And…..back to your original statement.

    “Tonite I wanted to reinstall Sierra 10.12.6.”

    “I rebooted, holding Apple+R, and was asked to install Sierra.”

    I would suggest you proceed as you originally planned.

    More info regarding fusion drives and High Sierra, here:

    https://www.macrumors.com/2017/09/18/apple-files-system-no-fusion-drive-support/
    https://www.macrumors.com/2017/09/25/apfs-fusion-drive-high-sierra-update/

    Hope it helps.

    Good luck.
     

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5 September 29, 2017