Backstory: Installation of MacOS Mojava failed on my late '12 iMac with exception: com.apple.DiskManagement error -69854
. I can find few other questions with this problem, but the general consent is, that the problem comes from Mojave trying to convert the FusionDrive to APFS. I tried the installation two times, I do have a TimeCapsule backup as welll as a USB with bootable Mojave and am ready to try things out. What I thought would be smart to do is to convert the FusionDrive to APFS before attempting to upgrade the OS.
I see two possibilities: do it via DiskUtility, or from Terminal with diskutil
. The first option does not work as the menu entry is greyed out, if I try from High Sierra as well as from the Mojave USB stick. Running diskutil list
lists three disks:
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 999.3 GB disk0s2
3: Apple_Boot Recovery HD 650.1 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Macintosh HD 121.0 GB disk1s2
3: Apple_Boot Boot OS X 134.2 MB disk1s3
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +1.1 TB disk2
Logical Volume on disk1s2, disk0s2
{some id I am not sure if better hidden}
Unencrypted Fusion Drive
TLDR; which one of the drives do I have to convert to APFS and how?