Fusion Drive Reformat & Partition

I'm attempting to reformat my 2TB Fusion Drive (Late 2015 iMAC 4K) but it looks like I have screwed up the portioning from past attempts (See attached) and now I am unsure as to how I can fix it.





I thought that I was only supposed to have the


MacOS

Data Drive


Any assistance would be GREATLY. appreciated.


iMac 27″, macOS 12.6

Posted on Jan 2, 2023 9:29 AM

Reply
Question marked as Top-ranking reply

Posted on Jan 2, 2023 5:40 PM

You can use the steps in this Apple Support article to reset your Fusion Drive:

How to fix a split Fusion Drive - Apple Support.


Follow the steps for "If using macOS Mojave or later":

1- Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery. Release the keys when you see the Apple logo or spinning globe.
2- When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
3- Type diskutil resetFusion in the Terminal window, then press Return.
4- Type Yes (with a capital Y) when prompted, then press Return.
5- When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
6- Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.


Jack

Similar questions

2 replies
Question marked as Top-ranking reply

Jan 2, 2023 5:40 PM in response to PortOrchard

You can use the steps in this Apple Support article to reset your Fusion Drive:

How to fix a split Fusion Drive - Apple Support.


Follow the steps for "If using macOS Mojave or later":

1- Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery. Release the keys when you see the Apple logo or spinning globe.
2- When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
3- Type diskutil resetFusion in the Terminal window, then press Return.
4- Type Yes (with a capital Y) when prompted, then press Return.
5- When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
6- Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.


Jack

Jan 2, 2023 10:11 AM in response to PortOrchard

Why not simply take the computer to your local independent Apple Authorized Service Provider and have them do the work for you. Not to be insulting but it seems this isn't in your skill set so why not have someone that knows what they are doing do the work? You can find an independent Apple Authorized Service Provider in your general area by clicking Apple Authorized Service Provider Locator (AASP) & Genius Appointment

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Fusion Drive Reformat & Partition

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.