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    Partition a Fusion Drive with El Capitan and High Sierra

    by bobmyers ·

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    Recently I tried to partition a late 2013 iMac with 1.12 TB fusion drive with a 2nd partition to use High Sierra.

    I successfully installed High Sierra on a USB, backed up with Time Machine, and planned on restoring that backup to the new partition. It is too slow on the USB drive.

    However, Disk Utility froze, and I lost half the fusion drive, gone. I had to delete the drive and restore El Capitan to fix the fusion drive.

    Above is a link of a discussion I have going on Apple. It is surprising that no one has done this before or can explain how you can wipe out half a disk.

    Base on the Tech article I just read regarding the new APFS file system, I am wondering if I can even do this.

    My plan was to make sure I partition the Fusion Drive, top of list, as an APFS and restore High Sierra to that partition. Question, will this even work? Will it break the fusion drive? APFS does not support fusion drives, but El Capitan does. So would I have one partition old file, and one new file.


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      Fusion Drives

      by mrmacfixit ·

      In reply to Partition a Fusion Drive with El Capitan and High Sierra

      After reading through that discussion, I feel that you have pretty much covered every angle.
      The suggestion of a SSD connected to a USB3 drive is probably the best alternative.
      I run Windows off that arrangement.


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