I have a 2013 iMac (27" 3.5GHz i7, model id iMac14,2, EMC 2639) that has a Fusion drive. I want to replace the Fusion's internal HDD with an SSD. My understanding is that I should split the Fusion drive before performing this.
I referred to the article https://www.macworld.com/article/2015664... which discusses the use of diskUtil and Core Storage to get the GUIDs and split the drive.
However, invoking disktutil coreStorage list returned ‘No CoreStorage logical volume groups found’. I then tried diskutil list, which returned more information, apparently showing the fused drives as ‘synthesized’. I read a bit about this in other discussions, and it seems like this is perhaps a Mojave/APFS version of a Core Storage Fusion config.
I’m wondering what I need to do to split my Fusion drive. Is there something else to use, or do I not even need to split the HDD/SSD before replacing the HDD?
Here is the output from diskutil list (I'm booted from an external drive named "External Drive". I think the first three entries are for my internal Fusion drive, and the last two entries are for the external drive:
/dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *3.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk2 3.0 TB disk0s2 /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_APFS Container disk2 121.1 GB disk1s2 /dev/disk2 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +3.1 TB disk2 Physical Stores disk1s2, disk0s2 1: APFS Volume Preboot 28.7 KB disk2s2 2: APFS Volume Recovery 20.5 KB disk2s3 3: APFS Volume VM 2.1 GB disk2s4 4: APFS Volume Macintosh HD 9.6 MB disk2s1 /dev/disk3 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *4.0 TB disk3 1: EFI EFI 209.7 MB disk3s1 2: Apple_APFS Container disk4 4.0 TB disk3s2 /dev/disk4 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +4.0 TB disk4 Physical Store disk3s2 1: APFS Volume External Drive 81.6 GB disk4s1 2: APFS Volume Preboot 45.7 MB disk4s2 3: APFS Volume Recovery 512.5 MB disk4s3 4: APFS Volume VM 17.2 GB disk4s4