diskutil resetFusion not working on 2017 iMac

[TJForum]

I bought a 2017 iMac 27” with fusion drive and a MacOS Big Sur partition and a Windows partition. I erased the windows partition, but now when I am in recovery mode under Disk Utility it shows two separate drives, a 128 GB internal drive and a 2 TB internal drive.

Following Apples support document on how to merge the two drives, I try the following diskutil resetFusion command in the terminal, but it says that it can not find that command.

What am I missing?

 

[mdgm]

Edit: oops, I see you were already in the recovery partition.

Fusion drives don't work that great on Big Sur. Maybe they changed the command or deprecated it.

 

[TJForum]

Have you tried booting off the recovery partition and running the command from the Terminal there?

How do I go about doing that?

 

[mdgm]

It looks like from your screenshots you were in recovery mode already?

When you boot, hold down the Option(Alt) key. You should then see the option to choose the Recovery partition.

The Terminal should be available from the Utilities Menu on that.

 

[TJForum]

It looks like from your screenshots you were in recovery mode already?

When you boot, hold down the Option(Alt) key. You should then see the option to choose the Recovery partition.

The Terminal should be available from the Utilities Menu on that.

Tried that and it doesn’t give me the option of choosing any partition, it just goes right into recovery mode.

 

[TJForum]

Not even a startup disk to choose from:

 

[mdgm]

Is your data backed up?

Do you have another Mac and/or a bootable USB installer?

 

[TJForum]

Is your data backed up?

Do you have another Mac and/or a bootable USB installer?

I have everything backed up via time machine and an external drive. I do not have another Mac or bootable USB though.