I would unplug the cables for sr0 and boot with only sr1 connected ...... then see if it works as expected or not.
If not, then I would change the data cable to the one that sr0 was using, so sr1 is now using the sr0 cable and the socket sr0 was using ...... reboot and try again.
It is a long time since I saw reports of some optical devices throwing problems and not being fully compatible with Linux/PCLinux.