Harry Bloomfield, Esq. wrote:
Theo presented the following explanation :
It's not part of the drive, it's a separate NVMe stick.
The driver software uses it as cache for other drives, but you can access it
as a small NVMe drive (eg 16GB) if you really want.

Correct - it looks as if I could upgrade the Optane from 16Gb to 32 or
maybe even 64Gb.

It only shows the single C: drive.

I'm assuming that's correctly configured then. The driver takes one NVMe
and one HDD and creates a new virtual drive. The virtual drive uses the
NVMe and HDD as backing storage under the hood - you don't get to access
them directly as drives.

I might expect the underlying constitutents to show up as PCIe/SATA devices
but not as drives.

Theo