Make sure you specify a partition on the SSD as -device! Otherwise macOS will boot EFI from the partition, but your bootloader will not find the SSD (where the actual install is) and you will end up in rescue mode.Whenever Apple talks about the Mac mini-like at the October event in Cupertino-the company always mentions how the Mac mini is a favorite with first-time Mac users. # bless -device=/dev/disk1s2 -file=/Volumes/EFI/efi/BOOT/BOOTX64.EFI -setBoot efi to EFI/BOOT/BOOTX64.EFI, then run the following command from macOS, after mounting the EFI partition: To change the default boot option to Arch Linux, you need to "bless" the newly created UEFI file. When rebooting, hold Option to show the internal bootloader so you can select your new install. This will show you a boot menu where you can select the USB drive for booting.įollow the Installation guide, remember to mount the EFI system partition (the first partition of the HDD, e.g. Now boot the Arch Linux USB stick by holding Option while booting your iMac. Optionally, use the Disk Utility on the newly installed OS to resize the macOS partition and allocate some space for Linux to use besides the SSD. The macOS installer should show you 1 disk, which is the Journaled HFS+ volume on the HDD. This will recreate the CoreStorage volume even if you choose not to 'fix' anything, undoing everything we have done so far. Do not use the GUI-based Disk Utility at this point, it will show your disks as errored in red and will want to fix them for you. Quit the terminal and start the macOS installer. This will remove everything, including the partition table, so macOS does not see the disk and will not try to use it during installation.Įrase the HDD (this is faster then zeroDisk and creates a new HFS+ volume for macOS) Zero the SSD (if you specify the correct disk this takes around 5 minutes)
Sometimes you need to unmount a volume or try the above command twice for macOS to actually run it successfuly. When the recovery has started, start a terminal from the Utilities menu.ĭestroy CoreStorage and prepare new volumesįind the CoreStorage 'Logical volume group' ID, and take note of the SSD and larger disk (disk0 & 1)
Power on your iMac, holding down Command+R to enter the recovery environment. This will allow working on the HDD and SDD without them mounted. The iMacs that come with Fusion also come with a rescue partition that runs itself from RAM (a virtual disk2). To reinstall macOS to the HDD without using the SSD, allowing the later to be used for Arch Linux, this volume needs to be removed. Apple uses a RAID alternative called CoreStorage to merge the SSD and HDD into a single logical volume (sold as Fusion).
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