In this article we highlight and provide workarounds to successfully install macOS 10.13 High Sierra onto the legendary (the last of the Mac mini’s which could be configured with dual internal hard drives) Mac mini Late 2012 (6,2). We haven’t tried it with other Macs but the theories applied here should work the same if you are facing similar issues on other Macs.
Despite the touted ‘ease of use’, unfortunately Apple Inc has taken two steps back with their roll out of macOS 10.13 High Sierra. Its the “latest and best macOS yet”, bringing with it Apple’s new disk format, dubbed the Apple File System(APFS) that:
- aims to fix core problems with the waning Hierarchical File System (HFS+) and;
- is optimised for Flash and Solid-State drive (SSD) storage.
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Unfortunately we’re sad to report the future is not quite here yet.
APFS has been initially designed to function on pure Flash or SSD storage media, and does not support Fusion Drives and this forms the core of all that is wrong with High Seirra. At least for now.
Whether intended or not, this results inadvertently in the macOS 10.13 High Sierra installer running into trouble when faced with Mac systems that have more than one hard drive.
To set the scene, we are using a Mac mini Late 2012 (6,2) which has a dual internal hard drive configuration where the primary hard drive that the macOS sits on is a SSD whilst the secondary hard drive used to house the Home folder and data is a traditional mechanical hard drive.
This is quite a standard hardware configuration for Mac mini Late 2012 (6,2) owners who have set up their systems to get the ‘best bang for their buck’.
We are upgrading this Mac mini from macOS 10.12, Sierra.
In our experience, launching the App Store and using the automated High Sierra download and upgrade feature failed. No matter how many attempts we tried.
The App Store would download High Sierra – restart the Mac mini but half way through booting up, it would either prompt us with “an error occurred while verifying firmware” screen or restart into Recovery mode.
No amount of First Aid using Disk Utility whether within macOS or in the Recovery mode worked to overcome this incumbrance.
Not even manually running diskutil verifydisk disk0 in Terminal.
The result turns out the same even after we created a USB macOS 10.13 High Sierra installer and attempted the same install using this external USB macOS 10.13 High Sierra installer.
So far the only surefire solution appears to be removing all connected hard drives other than the primary hard drive which must be a SSD.
It appears for some reason the macOS 10.13 High Sierra’s installer gets confused when external hard drives are connected and might be mistaking the system to be a ‘Fusion Drive’ configuration subsequently cancelling the installation midway, rolling back the changes and returning you to your pre-install macOS.
So, here’s what you do – disconnect all external hard drives first.
Then, open up your Mac mini (don’t panic – you need not disassemble the entire Mac mini), unplug the secondary hard drive flex cable from the Logicboard and re-assemble it (do not attempt to restart your Mac mini without reinstalling the fan thinking that you’re smart and saving a step – your Mac mini will be toast shortly after restarting).
Attempt the macOS 10.13 High Sierra install again and ensure that you attempt it using an Administrator account that is resident on the primary hard drive (as opposed to one that is housed in an external hard drive).
The install should complete successfully.
Note the install usually restarts to a black screen with an Apple logo and a progress bar displaying the remaining time to completion, it may happen that the screen goes black and unresponsive for a few minutes. Do not panic hard shutdown the Mac mini yet.
The Mac mini will reboot after some time and continue the installation. Barring any further drama the install should be successful this time.
Now open up your Mac mini again and re-attach that secondary hard drive, reboot and check that everything works as before.
So, good news.
You’ve finally managed to bring your Mac mini up to speed with Apple’s latest macOS. Photos is now current and so is Notes.
You can now sync all those High Efficiency Image File Format (HEIF) pictures and High Efficiency Video Codec (HEVC) videos you’ve been taking on your iOS 11 devices into Photos.
You can also now make full use of Notes’ latest powerful features, which allows you to create tables and organise your notes by being able to pin favourite notes so that they are always on top. Download google hangouts on air for mac.
Long story short, your macOS now matches your iOS. Brill…
Unfortunately,… (yes, there’s always one) Apple Inc recently released a macOS 10.13.1 update and if you try installing this via App Store, you will face the same issue above.
How do we solve it?
You guessed it.
You’re going to have to repeat the process above, i.e. dismantle your Mac mini, disconnect the secondary hard drive and any other external hard drive before you attempt to rerun the macOS 10.13.1 update again.
Once done, put everything back together again.
Is there a permanent fix or do we have to live like this forever?
Elder scrolls online wont download past 10 mac os. Please forward your enquiries and complaints to Apple Inc at their feedback page.
Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Command (⌘)-R
Reinstall the latest macOS that was installed on your Mac (recommended).
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Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac.
Shift-Option-⌘-R
Reinstall the macOS that came with your Mac, or the closest version still available.
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
- If the installer is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.
macOS Recovery exceptions
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The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
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- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.