A fusion drive uses a traditional spinning hard drive fused with a small ssd in order to create a single drive About Fusion Drive, a storage option for some Mac computers - Apple Support
4 replies
The SSD in this case is on the NVMExpress bus and not part of the Fusion drive that what is so confusing.
Because the two different drives are combined with operating system software, even though they are in physically different locations on your iMac.
it’s broken
Why does System Information show that my 2019 iMac has a 120 gig SSD attached to my NVMExpress controller along with the Fusion drive attached to my SATA controller?