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.Separately, iPhone and iPad users will find the download of iOS 11 available too. Many of the changes brought to macOS High Sierra are under-the-hood and not particularly flashy, but should ultimately result in better performance on Macs. Failure to backup could lead to permanent data loss. It is critically important to backup a Mac before installing any system software update, particularly major operating system release versions. If you do not wish to install the update immediately, quit the installer when it appears.Īdditionally, if you plan on making a USB install drive for macOS High Sierra you would want to quit the installer and not install High Sierra yet, or make a copy of the install application located in the /Applications/ folder. Note the macOS High Sierra installer will launch automatically after downloading from the App Store. Download MacOS High Sierra from the Mac App Store here.The MacOS High Sierra software update package is available to download exclusively from the Mac App Store:

Generally speaking, the newer the Mac the better performance will be. MacOS High Sierra, versioned as 10.13, includes the all new APFS file system, improved graphics support, Safari 11, updates and new features in the Photos app, various enhanced security and privacy features, amongst other adjustments and changes.Īny Mac that supports macOS Sierra will also support macOS High Sierra, the full macOS High Sierra compatibility list can be found here.

High sierra fresh install