@flannelist & @sam1968 - While the file system would be flat, the storage space is only the size of the SATA drive not the total of the two drives! So in this case 2TB! Not the physical 2+1=3TB
This is both a space ($$) waste and really no performance improvement.
From a performance perspective: Hits you in both the limits of the PCIe/NVMe interface this series has PCI 2.0 and the number of lanes x2 while faster than the SATA III (6.0 Gbps) interface the OS’s overhead for Fusion Drive services mostly wastes that gain! This drive is running in compatibility mode if it’s working at all. A cheaper PCIe 2.0 x2 would have been a better choice and I would have used a 256GB drive for the Fusion Drive cache drive as being the better fit. I’m still not a lover of using M.2 drives more so in iMac’s given the work required to get to it. These drive/adapter setups are not that reliable Vs either using a real Apple or OWC SSD.
Now the better solution is to leave these as independent drives, using the Blade drive as the boot drive as well as the drive which hosts the applications as the app will be constantly need access (caching & paging) and some need scratch space which is best to leave on the blade as well. The OS also gains performance being on the Blade drive here we have it’s Caching and Virtual RAM it uses.
Then use the slower SATA interface drive for the bought media (music and vids) as well as your own creative work and most everything else.
Now to get into making things appear flat only needs the use of Aliases! Here placing them within the users folder within the blade drive or what I had done is just copy over the users home folder to second drive and then place the Alias within the Blade drive there’s a few tweaking needed to make this work which is a bit more involved within APFS.
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@sam1968 - I’m not following you here… When you boot up your system are you able to see both drives from within Disk Utility? Both should be visible in the left column.
par Dan