I realized I split up the Fusion Drive! So I rebuilt the fusion drive via the terminal, and attempted to re-install High Sierra.įailure after Failure. Well, I formatted the drives and killed the partitions, and lo' and behold, I had two drives.
CLEAN INSTALL MAC OS HIGH SIERRA AND THEN USE TIMEMACHINE FOR FILES UPDATE
We had a user accidentally update to Catalina - which as you might know, partitions the physical hard drive into a system partition and user partition (for read/write security on core system files, presumably) and also kills all 32-bit apps, as they are officially unsupported on Catalina and up. Restore the machine from a Time Machine backup (NOT a fresh install).See here for details, and also see some background theory.
For example if the HDD is " disk1", the large partition is probably something like " disk1s2". EXCEPT, in order to preserve the recovery partition on the new setup, do not choose the entire HDD for the Fusion terminal commands, just the large partition of it for storing data.Re-create the Fusion drive using these instructions from Apple.Everything should be like a typical system, except the parts of the Fusion drive will appear as two separate disks. Boot the computer as normal and do the basic setup steps as per any new Mac.Perform a fresh macOS install onto the HDD (not SSD) so that it stays as an jhsf+ (macOS extended journaled) volume.
Split up / sever the Fusion drive by following this guide from Macworld.Boot up from the drive by starting the computer and holding down the option key.I used this link to download High Sierra from the App Store, then these instructions from Apple to make a bootable drive. Create a High Sierra installation disk.
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