The Hardwired demo by Crionics/Silents does not like multi-drive.
The documentation here:
https://docs.libretro.com/library/puae/
says this:
For games that support multiple disk drives, append " (MD) " as in “MultiDrive” to the M3U filename to insert each disk in different drives. Only possible with maximum 4 disks!
MultiDrive option is enabled by default, so the tag is not necessary, but some games require disabling it, because they can’t handle multiple disk drives.
Fair enough, but what is the tag that should be appended to turn off MultiDrive/disable it as indicated above? It’s correct that some titles do require disabling it, but there doesn’t appear to be a means to do so.