can't open an old VM because the read-only ISO image is in use by a different running VM

[David Nicol]

I have a VM open and running, with a knoppix DVD as its media. Which should be read-only. I just upgraded VirtualBox and the new VirtualBox does not know about the VMs I had before the upgrade, so I tried to open one, that happens to have the DVD loaded in it. I got the attached.

Without opening the virtual machine definition file in a text editor or similar, there doesn't seem to be a way forward here, at least until I shut down the one that has the DVD image open.

Ideally, VirtualBox would let me open read-only media in multiple VMs at once. Next ideally, I should have gotten a settings editor, to remove the DVD from the non-running VM, or redirect it at a copy.

[David Nicol]

snip of the error