Hi I split my fusion drive and im trying to refuse it in recovery mode on mojave OS with comand "diskutil resetFusion" but when I type "Yes" it says comand not found. Im folling this guide: https://support.apple.com/en-us/HT207584
iMac 27″, macOS 10.14
The reason why it's not resetting is because the system sees 3 drives mounted instead of 2... disk0 (SSD), disk1 (HDD), and disk3 which looks like another HDD but might just be an APFS container - unless you physically have 3 drives in the Mac.
To fix this, erase the drives so macOS only sees 2 drives - data must be backed up before doing this:
What is the mac model?
How did you split it? Did any of your drives failed?
See this info from macOS terminal for diskutil:
resetFusion
For Fusion Drive machine hardware configurations, reset the disk devices in the machine to a factory-like state (one empty Fusion volume). This command requires the machine to contain exactly one internal solid-state device (SSD) and one internal rotational device (HDD); if so, you are prompted, and if you confirm, both devices are (re)-partitioned with GPT maps and a Core Storage Fusion Drive volume is created. No system soft-ware is installed and no user data is restored. All data on the machine is lost, including any "extra" partitions (e.g. for Boot Camp or other "user" purposes). You generally must be booted from the Internet Recovery System (CMD-OPT-R) or from an externally-connected macOS boot disk (e.g. a USB drive), because you cannot erase a volume with a currently-running macOS. Ownership of the affected disks is required.
I had to downgrade because of a work app compatibility and when I did downgrade looks like I instaled Mojave only on one half and divided them.
I have late 2015 Imac 27 inch i5 16ram 2gb graphic raedon in the latest mojave OS
Yes, in recovery mode or from an external drive.
You cannot erase/partition/clean install to a drive that you're currently started into - that's a "self-destruct" situation that macOS thankfully prevents.
You did everything correct - there are two physical drives under the Internal section.
The "macOS Base System" under Disk Images is the recovery partition that you're booted into.
But good to hear you got everything working.
from the recovery mode right?
When I erase the and still shows as disk0 and then disk0s2
Did as you told me but there are still 3 disk
👍
It worked with the sierra method: "diskutil cs create macintosh\ HD disk0 disk1" from the link I first gave
refusion a split fusion drive
