Can’t split iMac fusion drive

[silvertech]

iMac 2017 27” catalina

I am trying to split my fusion drive so I can upgrade my HDD with a 2tb Samsung sata ssd.

I have run into nothing but problems trying to split the drive.

I tried all the different commands, and guides I found onlinebut nothing has worked.

 

[Taz Mangus]

Try erasing the fusion drive as HFS+ first in Disk Utility.

How to split up a Fusion Drive

Whether you made your own Fusion Drive and want to go back, or want to split up one you got from Apple, we'll show you that it isn't a difficult or lengthy process.

www.macworld.com

 

[silvertech]

Try erasing the fusion drive as HFS+ first in Disk Utility.

How to split up a Fusion Drive

Whether you made your own Fusion Drive and want to go back, or want to split up one you got from Apple, we'll show you that it isn't a difficult or lengthy process.

www.macworld.com

I believe that guide is outdated, APFS does not use CoreStorage anymore.

 

[Taz Mangus]

I believe that guide is outdated, APFS does not use CoreStorage anymore.

That is why I suggested you erase your fusion drive as Mac OS Extended (HFS+) first. Break the fusion drive starting from HFS+ not APFS. Just a thought.