Talking of sleeping dogs, here's one I probably will let lie, unless anybody knows a simple solution.
Marvell are well known for their SATA controllers, often found on add-in PCIe cards to give extra SATA ports. I bought a Rivo 8-port card so I can add extra drives to my plex box. With Windows 11 pro, which isn't listed as supported, it just works from the start. Two new drives right there where they should be. The only odd thing is this. Disk Manager shows an extra, uninitialised drive. And no, it's not a partition being displayed. In device manager, under Disk drives I have an Unknown Device working "properly" using MS disk.sys as a driver. From cmd, diskpart also shows it as in the attachment.
With USB connected disks, I've seen the USB/SATA bridge displayed as a separate "disk" from time to time depending on the adapter, so I imagine something similar is happening here. I think the uninitialised disk is actually all or part of the SATA/PCIe bridge, which Windows is seeing as "something" connected to SATA, i.e. a disk drive of some sort.
Not really too bothered, apart from that annoying OCD thought that it shouldn't be there.
EDITED: 12 Feb 13:42 by WILLIAMA