I installed the GNU system in a real machine using the Guix 1.0 ISO installer (https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).
When I insert a CD or a DVD the drive light flashes for a moment, then turns off, but it seems the discs are never mounted. GNOME displays no messages, GNOME Files does not list the drive, I don't see anything related to DVD after running "findmnt", and running "lsblk" says:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931,5G 0 disk
??sda1 8:1 0 750M 0 part /boot/efi
??sda2 8:2 0 3,7G 0 part [SWAP]
??sda3 8:3 0 927,1G 0 part /
sr0 11:0 1 1024M 0 rom