What are these virtual disks?

https://preview.redd.it/gai1sc23j78e1.png?width=3076&format=png&auto=webp&s=7e4a62ba2a78791b0b2d787ccd530e542adb5bb2

https://preview.redd.it/n7z1qr13j78e1.png?width=1194&format=png&auto=webp&s=31b20ea82601647ce7aaddaad3ebf061f8bbba6e

I'm on Mac mini M4 base model with 15.2 non-beta installed, and all of a sudden I see these disks that I didn't see until yesterday. What are these, and can I eject them?